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Quantitative model for grain boundary effects on strength-electrical conductivity relation Acta Mater. (IF 8.3) Pub Date : 2024-09-13 Jiapeng Hou, Xiaotao Li, Shuo Wang, Xueyuan Fan, Chenghui Li, Qiang Wang, Zhenjun Zhang, Zhefeng Zhang
Fine-long shaped grains have been proved to be an efficient design approach to overcome the traditional trade-off relation between strength and electrical conductivity (EC) of metal wires. However, quantitative models linking grain shape parameters to both strength and EC remain scarce, limiting the precise optimization of material properties. In this study, grain boundaries (GBs) were classified into
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Three-dimensional phase field modeling, orientation prediction and stress field analyses of twin-twin, twin-grain boundary reactions mediated by disclinations in hexagonal close-packed metals Acta Mater. (IF 8.3) Pub Date : 2024-09-10 Haipeng Li, Yipeng Gao, Yongsi Wei, Jiyuan Ding, Chunfeng Du, Yizhen Li, Hui-Yuan Wang
Crystalline defects, such as dislocations, disclinations, twins and grain boundaries, play critical roles in determining the mechanical properties of metals and alloys. In particular, with multiple competitive deformation modes activated, the mechanical behaviors of hexagonal close-packed metals are strongly influenced by the interactions and reactions of various types of defects. Despite extensive
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Stability and deformation of a vacancy defect in skyrmion crystal under external magnetic and temperature fields Acta Mater. (IF 8.3) Pub Date : 2024-09-10 Yu Wang, Ryosuke Manabe, Kohta Kasai, Tao Xu, Takahiro Shimada
Skyrmion, a local bubble-like topological magnetization structure, can collectively emergent in magnets in a lattice form skyrmion crystal (SkX). SkX has great application potential in functional devices because it can manipulate material properties via coupling with atomic lattices. The lattice defects such as vacancy widely exist in the SkX as well, and they have rich dynamic behaviors and have great
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Self-healing ThSiO4-ZrSiO4 system under conditions relevant to underground nuclear waste repositories Acta Mater. (IF 8.3) Pub Date : 2024-09-07 Volodymyr Svitlyk, Stephan Weiss, Gaston Garbarino, Salim Shams Aldin Azzam, René Hübner, Andreas Worbs, Nina Huittinen, Christoph Hennig
Two series of ThZrSiO phases were synthesized hydrothermally under weakly basic (pH = 8) and strongly acidic (pH = 1) conditions. Changes in pH were found to have a significant effect on experimental phase diagrams. Synthesis at pH = 8 favors the formation of Th-rich phases with resulting ThZrSiO solid solution for = 0 – 0.5. Contrary, synthesis at pH = 1 results in the formation of pure end-members
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On the iron content of Mn-Ni-Si-rich clusters that form in reactor pressure vessel steels during exposure to neutron irradiation Acta Mater. (IF 8.3) Pub Date : 2024-09-07 Benjamin M. Jenkins, Aidar Zakirov, François Vurpillot, Auriane Etienne, Cristelle Pareige, Philippe Pareige, Bertrand Radiguet
Solute cluster formation during service is the primary cause of embrittlement in reactor pressure vessel (RPV) steels. Atom probe tomography (APT) has consistently shown that the solute clusters are enriched in Cu, P, Mn, Ni, and Si compared to the matrix. However, there is pronounced disagreement within the literature as to the Fe content of the solute clusters in low-Cu RPV steels; some authors report
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Anisotropic ferroelectric-shaped hysteresis loop and colossal permittivity in thermally treated rutile TiO2 single crystals Acta Mater. (IF 8.3) Pub Date : 2024-09-07 Yuechan Song, Jinqiu Liu, Jinxiang You, Gaoyun Niu, Jiangbo Lu, Xiao-ming Chen, Peng Liu
Space charge polarization is an unavoidable phenomenon in electronic components that leads to deterioration of electrical response. Hence manipulation and utilization of space charge polarization to improve electrical properties is a phenomenal task. In the present study, heating treatment produces oxygen vacancies, resulting in the crystal structures (i.e., modulated structure and intergrowth structure)
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Ce(III) formate-derived hierarchical cerium oxide particles with icosahedral symmetry-based architectures: Effect of third level of structural hierarchy in soot and propane oxidation Acta Mater. (IF 8.3) Pub Date : 2024-09-06 Piotr Woźniak
The article investigates the role of architecture of complex hierarchically structured ceria and gadolinium doped ceria particles in soot combustion (solid-solid reaction) and propane oxidation (gas-solid reaction). Synthesis of hierarchical ceria mesostructures showing icosahedral symmetry-based architecture has been presented for the first time. Carefully choosing synthetic conditions allows to obtain
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New insights on the interaction of solutes with the defects during creep deformation of CMSX4 Ni-based single crystal superalloy Acta Mater. (IF 8.3) Pub Date : 2024-09-06 Akshat Godha, Dipak Das, Partha Ghosal, Surendra Kumar Makineni
Solutes segregation effects to the defect structures produced during the creep of superalloys are believed to influence their high-temperature performance. This study reveals the selective segregation of solutes to the defects in a multi-component single crystal γ/γ' Ni-base superalloy (CMSX4). The defect structures formed in γ' are superlattice-extrinsic-stacking faults (SESFs), micro-twins, and anti-phase
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Atomic and electronic structures of inversion domain boundary in MgO doped AlN Acta Mater. (IF 8.3) Pub Date : 2024-09-05 D. Kato, B. Feng, T. Nishi, Y. Noritake, T. Hishida, N. Shibata, K. Matsunaga, Y. Ikuhara
AlN has been used as electrostatic chucks due to its high volume resistivity. It has been reported that the doping of MgO can further increase the volume resistivity even at high temperature. The enhancement was proposed to be correlated with its internal defects: inversion domain boundaries (IDBs), but the detailed mechanism is still not clear. In this study, we clarify the origin of increased volume
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Highly-pseudocapacitive origin and design principles of MoS2 for high-performance aqueous zinc-ion storage Acta Mater. (IF 8.3) Pub Date : 2024-09-05 Sifan Qiao, Wei Zhang, Yong Gao, Xinyan Zhou, Qing Liang, Zhenhai Xia, Seung Jo Yoo, Jin-Gyu Kim, Oleksandr Bondarchuk, Zhenzhen Zhao, Fuxi Liu, Xin Ge, Chengxiang Huang, He Yang, Hongge Pan, Weitao Zheng
Pseudocapacitive storage of Zn in nanostructured molybdenum disulfide (MoS) is expected to break through the limitations of sulfide in monovalent or multivalent ions storage; however, the deficiency of theoretical guidance and experimental strategies that enable rational design of MoS as a kind of cathode material towards aqueous zinc-ion batteries. Herein, we firstly establish guiding theory in order
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Multiscale hierarchical heterostructure yields combined high strength and excellent ductility in a Co-Cr-Fe-Ni-Al negative enthalpy alloy Acta Mater. (IF 8.3) Pub Date : 2024-09-05 Zibing An, Shengcheng Mao, Ashok Vayyala, Luyan Yang, Cheng Jiang, Caijuan Shi, Yi Liu, Hao Zhou, Xiaozhou Liao, Ze Zhang, Xiaodong Han
Developing high-performance metallic materials with high yield strength and excellent ductility is important for various applications, such as automobiles, power plants, and aerospace industries. However, conventional alloys typically exhibit a trade-off between strength and ductility, making it difficult to develop materials that are both strong and ductile. In this study, we report that a cast Co-Cr-Fe-Ni-Al
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Coordinating the deformation of a low-alloyed magnesium alloy for a superior combination of strength and ductility through core-shell structured reinforcements Acta Mater. (IF 8.3) Pub Date : 2024-09-05 Xuezheng Zhang, Yao He, Tijun Chen, Guangli Bi, Yuandong Li, Dan Tang, Xiaoming Wang
The trade-off between strength and ductility is a longstanding puzzle in metallic materials. Here we present a novel strategy to acquire simultaneously high strength and ductility in a low-alloyed Mg-3.16Zn-0.97Ca-0.55Al-0.44Ag (wt.%) alloy by forming special core-shell structured reinforcements in grain interior through a modified thixoforming technique. The core-shell structured reinforcements consist
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Recrystallization of deformed metal nanoparticles Acta Mater. (IF 8.3) Pub Date : 2024-09-05 Jonathan Zimmerman, Eugen Rabkin
Despite great advances in the fabrication methods of metal nanoparticles with various sizes and shapes, the available tools for manipulating their microstructure and morphology still remain limited. In the present work we introduce the age-old metallurgical technique of recrystallization to the synthesis of metallic nanoparticles. We uniaxially compressed a large number of single crystalline and defect
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Formation and strengthening mechanism of ordered interstitial complexes in multi-principle element alloys Acta Mater. (IF 8.3) Pub Date : 2024-09-03 Xiao-Ye Zhou, Hong-Hui Wu, Yuan Wu, Xiongjun Liu, Xiangyang Peng, Shuo Hou, Zhaoping Lu
Ordered interstitial complexes (OIC) are in the intermediate state between random interstitial solutes and chemical compounds, which can effectively improve the mechanical performance of multi-principle element alloys. Nevertheless, experimentally observing the complex atomic details of OIC formation and their interaction with dislocations remains challenging. Meanwhile, simulations of the OIC behavior
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Unfolding the mysterious roles of GeTe/SnTe compositing within CuInTe2 thermoelectric alloy: Short-range and local chemical orders Acta Mater. (IF 8.3) Pub Date : 2024-09-03 Wenxin Fan, Pengfei Yu, Lifeng Jiang, Zhen Tian, Erkuo Yang, Saichao Cao, Huijun Kang, Enyu Guo, Zongning Chen, Rongchun Chen, Mingxu Xia, Tongmin Wang
The optimization of thermoelectric (TE) properties in TE materials requires controlling intrinsic factors such as order/disorder in crystal and chemical structures. Although heterogeneous interfaces play a key role in regulating TE properties, the corresponding atomic disorder-order has been ignored in composited systems. We demonstrate examples of GeTe/SnTe compositing for tuning CuInTe TE properties
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Oxygen ion diffusion in RE3TaO7: Why long-range migration of O2− is prohibited in the defective-fluorite structure? Acta Mater. (IF 8.3) Pub Date : 2024-09-02 Guoliang Ren, Hanchao Zhang, Junwei Che, Huangyue Cai, Yidong Hu, Qiaodan Hu, Na Ni, Xiaofeng Zhao, Fan Yang
Oxides with low O lattice diffusion rate are critical for the development of topcoat materials for next generation thermal barrier coatings (TBCs) working at > 1600 °C to prevent the fast growth of thermally grown oxide (TGO) at the bondcoat/topcoat interface. Here we delve into a comprehensive analysis of the oxygen ion transport characteristics of the recently developed low-, medium- and high-entropy
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Electromechanical coupling in alkaline-earth doped-ceria ceramics Acta Mater. (IF 8.3) Pub Date : 2024-09-02 Victor B. Tinti, Ahsanul Kabir, Daniel Z. de Florio, Vincenzo Esposito
Oxygen-deficient cerium oxide ceramics exhibit an anomalously high electromechanical response called giant electrostriction. This feature has been linked to the polarization and reorganization of ionic defects, i.e., , under an electric field. However, the exact mechanism and how it is related to intrinsic/extrinsic characteristics of doped ceria remains unclear. The present work investigates how alkaline-earth
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Twin experiments and detailed investigation of data assimilation system for columnar dendrite growth in thin film Acta Mater. (IF 8.3) Pub Date : 2024-09-01 Ayano Yamamura, Shinji Sakane, Munekazu Ohno, Hideyuki Yasuda, Tomohiro Takaki
Accurately predicting dendrite growth during alloy solidification is crucial for enhancing the quality of metallic products. Recently, data assimilation has emerged as a promising tool for integrating two cutting-edge methods for studying dendritic growth, viz. in situ X-ray observation experiments and phase-field (PF) simulations, to elucidate important parameter(s) of the simulation and produce a
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Deformation-induced martensitic transformation kinetics in TRIP-assisted steels and high-entropy alloys Acta Mater. (IF 8.3) Pub Date : 2024-09-01 Mohammad Javad Sohrabi, Mohammad Sajad Mehranpour, Ali Heydarinia, Alireza Kalhor, Jae Heung Lee, Hamed Mirzadeh, Reza Mahmudi, Mohammad Habibi Parsa, Kinga Rodak, Hyoung Seop Kim
In this study, the sigmoidal kinetics of deformation-induced martensitic transformation (DIMT) in the transformation-induced plasticity (TRIP)-assisted alloys, including metastable high-entropy alloys (HEAs), austenitic stainless steels, and advanced high-strength steels (AHSSs) such as low-alloyed TRIP steels, medium-Mn steels, and quenching and partitioning steels, were studied using various models
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High oxygen vacancy concentration and improved electrical conductivity in tetragonal LaNbO4 stabilized by Ga and Mo Co-doping on the Nb site Acta Mater. (IF 8.3) Pub Date : 2024-08-31 Xiaoxu Duan, Shuangfeng Wu, Jiazheng Hao, Lunhua He, Chenjie Lou, Mingxue Tang, Xia Deng, Jiasheng Lv, Jing Fang, Laijun Liu, Jungu Xu
The LaNbO-based materials were well documented to be good ionic conductors with the charge carriers of protons or interstitial oxygen ions. Herein, for the first time, we reported that the high oxide ion conduction, e.g. 3 × 10 S cm at 900 °C, mediated by oxygen vacancies was achieved in LaNbO via equimolar Ga and Mo co-doping on the Nb site. Such a co-doping effectively stabilize the high temperature
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Competition between microstructural factors affecting growth of abnormally large grains in thin Cu foils Acta Mater. (IF 8.3) Pub Date : 2024-08-30 Jing Guo, Chunlei Zhang, Dana Zöllner, Xin Li, Guilin Wu, Tianlin Huang, Wolfgang Pantleon, Xiaoxu Huang, Dorte Juul Jensen
Grain boundary types and local boundary curvatures are generally considered to be important microstructural factors controlling grain boundary migration during grain growth. In this work, grain growth in thin copper foils is studied during annealing at a temperature of 1040 °C near the melting point by ex-situ experiments and Monte Carlo simulations. Few grains, stimulated by slight deformation at
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Influence of surface roughness on the deformation of gold nanoparticles under compression Acta Mater. (IF 8.3) Pub Date : 2024-08-30 Hugo Iteney, Thomas W. Cornelius, Olivier Thomas, Jonathan Amodeo
The influence of surface roughness on the mechanics of faceted gold nanoparticles under compression is investigated using molecular dynamics simulations. Results show an increasing impact of the surface roughness on the mechanical response while decreasing the roughness parameters with critical strength variations up to 90% of the one computed in case of flat-surface nanoparticles. Surface ledges act
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In-situ electron channeling contrast imaging of local deformation behavior of lath martensite in low-carbon-steel Acta Mater. (IF 8.3) Pub Date : 2024-08-30 Shuang Gong, Meng Zhang, Junya Inoue
In-situ tensile Electron Channeling Contrast Imaging (ECCI) observations were performed on low-carbon steel lath martensite to elucidate its plastic deformation mechanisms under tensile loading. Two key deformation processes were identified through the direct observation of dislocation activity: intra-lath crystallographic slip and boundary sliding. The initial dislocation movement signifies the onset
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Rational triple optimizations boost near-room-temperature thermoelectric performance of BiSe Acta Mater. (IF 8.3) Pub Date : 2024-08-30 Hui Liu, Xiao-Lei Shi, Lin Pan, Yuanqing Mao, Meng Li, Lijun Wang, Wei-Di Liu, Qingfeng Liu, Yifeng Wang, Zhi-Gang Chen
As a Te-free alternative to BiTe, BiSe exhibits attractive near-room-temperature thermoelectric potential as an n-type material, yet its excessive electrical conductivity limits practical applications. To enhance the overall thermoelectric performance, we devise a rational triple optimization process to boost the figure of merit, , of polycrystalline BiSe up to 0.84 at 475 K, a current record-high
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Excellent mechanical and damping properties simultaneously achieved in partially recrystallized Fe-Mn-Nb alloy Acta Mater. (IF 8.3) Pub Date : 2024-08-30 Ru Ge, Yu Wang, Bin Hu, Caijun Zhang, Haiwen Luo
We propose a novel approach to tackle the intrinsic trade-off between the mechanical and damping properties of a cold-rolled Fe-17Mn-Nb alloy by tailoring the fraction, size and spatial distribution of recrystallized (Rexed) grains, the latter results from the initial micro-segregation of Mn during solidification because higher Mn content in the interdendritic region can promote more NbC particles
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Process optimization on kesterite-based ceramics for enhancing their thermoelectric performances assisted by active machine learning approach: A tool for metal-sulfide ceramics development Acta Mater. (IF 8.3) Pub Date : 2024-08-29 Cédric Bourgès, Guillaume Lambard, Naoki Sato, Makoto Tachibana, Satoshi Ishii, Takao Mori
The thermal process parameters are crucial in metal-sulfides ceramics as they affect significantly the resulting physico-chemical properties. In the present work, we investigated the sintering effect in the kesterite CuZnSnS on its structural, microstructural, and thermoelectric (TE) properties to highlight the non-negligible contribution of the thermal process often ignored in metal-sulfide ceramics
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Strong pinning effect on domains in piezoelectrics Acta Mater. (IF 8.3) Pub Date : 2024-08-29 Shuo Tian, Jianpeng Xin, Yi Cheng, Lixiang Lai, Bin Li, Yejing Dai
In high-power applications, since mechanical losses in piezoelectric devices always result in considerable heat generation, the temperature stability of the mechanical quality factor () is particularly crucial and should be considered in real piezoelectric applications. Here, we propose a poling-aging-repoling strategy to make the defect dipoles aligned with the poling direction as much as possible
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Shape memory and superelasticity in polycrystalline ceria-stabilized zirconia honeycombs Acta Mater. (IF 8.3) Pub Date : 2024-08-28 Laura K. Quinn, Remelisa Esteves, Perla Latorre-Suárez, George R. Rossman, Seetha Raghavan, Katherine T. Faber
Shape-memory and superelastic materials undergo a reversible martensitic transformation that allows them to return to their original state after deformation, either on the application of heat or the removal of stress. While zirconia-based ceramics can undergo this martensitic transformation, the volume expansion that accompanies the transformation can cause mismatched stresses at grain boundaries in
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Effect of grain morphology and interface on the toughness of nacre-like aluminas Acta Mater. (IF 8.3) Pub Date : 2024-08-28 Victoria Vilchez, Shelley Rawson, Shitong Zhou, Jamie McGregor, Matthew Lawson, Alexander Rack, Yunhui Chen, Philip J. Withers, Florian Bouville
Ceramic composites that are both tough and strong are needed for extreme environments, ranging from aerospace and nuclear, to medical applications. Bioinspired ceramic composites tackle this challenge by mimicking tough natural structures. Nacre-like aluminas (NLAs) are ceramics processed using advanced colloidal techniques to obtain a microstructure resembling the brick-and-mortar structure of nacre
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Challenges in developing materials for microreactors: A case-study of yttrium dihydride in extreme conditions Acta Mater. (IF 8.3) Pub Date : 2024-08-27 M.A. Tunes, D. Parkison, Y. Huang, M.R. Chancey, S.C. Vogel, V.K. Mehta, M.A. Torrez, E.P. Luther, J.A. Valdez, Y. Wang, J. Yu, M.N. Cinbiz, A.P. Shivprasad, C.A. Kohnert
The development of microreactor technology presents an efficient solution for providing portable electricity, catering to both human space exploration needs within our solar system and supplying power to remote Earth-bound areas. The miniaturization of nuclear reactors poses immediate new challenges for materials science with respect to the capability for controlling nuclear reactions via thermalization
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Integrated experimental and computational study on the effect of hydrogen in mechanical responses of pure tungsten Acta Mater. (IF 8.3) Pub Date : 2024-08-27 Yeonju Oh, Simoon Sung, Jae-il Jang, Won-Seok Ko, Heung Nam Han
Hydrogen irradiation profoundly changes the microstructure and morphological characteristics of tungsten, ultimately resulting in the modifications to its mechanical properties. Unfortunately, the specific mechanisms through which hydrogen irradiation influences the mechanical behavior of tungsten have not been clearly elucidated. Therefore, this study aims to further improve the understanding of the
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Structural size effect-, aging time-, and pressure-dependent functional properties of Mn-containing perovskite nanoparticles Acta Mater. (IF 8.3) Pub Date : 2024-08-26 Danyang Su, N.A. Liedienov, V.M. Kalita, I.V. Fesych, Wei Xu, A.V. Bodnaruk, Yu.I. Dzhezherya, Quanjun Li, Bingbing Liu, G.G. Levchenko
Nanoparticles’ properties are determined by their size and structure. When exposed to external pressure , their structural properties change. The improvement or degradation of samples’ properties depending on time is particularly interesting. The knowledge of the influence of structural-size effect, aging time, and pressure on compounds’ behavior is essential for fundamental and applied purposes. Therefore
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Hydrogen-enhanced microbanding in an austenitic FeMnAlC low-density steel: Effect on hydrogen embrittlement resistance Acta Mater. (IF 8.3) Pub Date : 2024-08-26 Ivan Gutierrez-Urrutia, Yuhei Ogawa, Akinobu Shibata
We have investigated the influence of 101 mass ppm hydrogen content on the room temperature deformation structure and mechanical behavior of an austenitic Fe30Mn6.5Al0.3C (wt.%) low-density steel by several electron microscopy techniques, such as electron channeling contrast imaging (ECCI), electron backscatter diffraction (EBSD), and scanning transmission electron microscopy (STEM). The steel exhibits
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Disconnection units of twinning in body-centered-cubic metals Acta Mater. (IF 8.3) Pub Date : 2024-08-25 Gaobing Wei, Hongxian Xie, Jun-Ping Du, Tingting He, Guanghong Lu, Shigenobu Ogata
Twin boundary (TB) migration, facilitated by the motion of disconnections, plays a pivotal role in the deformation of body-centered cubic (BCC) crystals. Comprehending the migration rules of twinning disconnections (TDs) under shear stress is significant in elucidating the role of twin migration in BCC plasticity. Nevertheless, our understanding of the atomic structure and migration mechanics of TDs
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3D in situ observation of the capillary infiltration of molten silicon in a SiC/SiC composite by X-ray tomography Acta Mater. (IF 8.3) Pub Date : 2024-08-24 H. Carpentier, G. Couégnat, O. Caty, A. King, Y. Le Petitcorps, E. Maire, A. Marchais, N. Eberling-Fux
The Liquid Silicon Infiltration (LSI) process is used to decrease residual porosity of SiC/SiC composite materials. However, it is not fully mastered since the mechanisms involved at 1500 °C under high vacuum are complex to analyze, especially without direct observation. Previous work had demonstrated the feasibility of using X-ray radiography to observe the front rise of silicon in a SiC/SiC composite
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Emergence of critical thickness and multifaceted role of stacking faults in high misfit hexagonal ferrites films Acta Mater. (IF 8.3) Pub Date : 2024-08-24 Xiangfei Li, Zonglin Lv, Ying Meng, Luyao Wang, Haoyu Zhuang, Qinwen Guo, Xiaohui Yu, Xi Shen, Jun Miao, Richeng Yu
Polarization in improper ferroelectrics is believed to be robust against the depolarizing field. However, this characteristic appears to be disrupted in hexagonal ferrite and manganite, leading to a controversial debate regarding the origin of the critical thickness. In this study, we design hexagonal TbFeO (-TFO) films which exhibits a critical thickness exceeding 5 nm at room temperature and an exceptionally
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A mechanical TiAl/TiAlN multinanolayer coating model based on microstructural analysis and nanoindentation Acta Mater. (IF 8.3) Pub Date : 2024-08-23 S. Giljean, Y. Gaillard, C. Rousselot, C. Bouillet, M. Lenertz, F. Richard, M.-J. Pac
A finite element model reproducing the mechanical behaviour during nanoindentation tests on TiAl/TiAlN multilayer coatings was developed. Coatings with two different nanoperiods (10 and 50 nm) were deposited by radio-frequency magnetron sputtering from a single sintered titanium/aluminium target using the reactive gas pulsing process. X-ray diffraction and transmission electron microscopy confirmed
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Precipitation kinetics of ferritic / martensitic oxide dispersion strengthened steels: Influence of the matrix phase transformation Acta Mater. (IF 8.3) Pub Date : 2024-08-23 Gabriel Spartacus, Joël Malaplate, Frédéric De Geuser, Isabelle Mouton, Denis Sornin, Raphaëlle Guillou, Alexis Deschamps
ODS steels are candidate materials for the future generation of nuclear power plants. Ferritic / Martensitic (F/M) ODS steels display better formability thanks to high temperature austenitic transformation. The precipitation kinetics of a F/M Fe‑9Cr ODS steel during powder consolidation up to 1100 °C has been characterized by Small Angle X-ray Scattering (SAXS). The influence of the matrix phase transformation
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Microstructure effects on high velocity microparticle impacts of copper Acta Mater. (IF 8.3) Pub Date : 2024-08-23 Tyler J. Lucas, Alison M. Saunders, Christopher A. Schuh
Constitutive models can fail to predict high-rate deformation behavior due to their inability to account for microstructural effects. In part, this is because of a dearth of experimental benchmarking data in the high strain-rate, low pressure regime, since many high-rate experiments also probe a region of strong shockwaves, at which point microstructure effects no longer play a primary role. This work
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Influence of surface pre-deformation on the Portevin-Le Chatelier effect and the related multiscale complexity of plastic flow in an Al-Mg alloy Acta Mater. (IF 8.3) Pub Date : 2024-08-23 Hafsa Jaber, Benoît Beausir, Denis Entemeyer, Tatiana Lebedkina, Marc Novelli, Mikhail Lebyodkin
The influence of the surface pre-deformation on jerky flow caused by the Portevin-Le Chatelier (PLC) effect was investigated using flat tensile specimens of an Al-Mg alloy. Although jerky flow represents a macroscopic plastic instability, the underlying mechanisms stem from self-organization of dislocations, which pertains to deformation processes at mesoscopic scales. To provide a comprehensive approach
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Red-to-ultraviolet light chargeable Sm2+-activated deep-red persistent phosphor for simultaneous bioimaging and bio-temperature sensing Acta Mater. (IF 8.3) Pub Date : 2024-08-23 Chuan Liao, Feng Liu, Hao Wu, Huajun Wu, Liangliang Zhang, Guo-hui Pan, Zhendong Hao, Xiao-jun Wang, Jiahua Zhang
Persistent phosphor-based bio-applications do not need real-time photo-excitation and do not suffer from disturbance of stray excitation light, auto-fluorescence of the measured substance and heat produced by excitation. However, the persistent phosphors that well match the optical biological windows are deficient. Here, we report for the first-time divalent samarium (Sm) activated persistent phosphor
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Hierarchical nanolayered structures-enabled record-high fracture resistant zircaloy Acta Mater. (IF 8.3) Pub Date : 2024-08-23 Xiao-Wei Zou, Irene J. Beyerlein, Wei-Zhong Han
As a widely used nuclear structural material, zirconium (Zr) alloys are susceptible to brittle hydride-induced cracking. The intrinsic inability to arrest this cracking tendency in Zr poses a significant threat to the service safety of Zr cladding tubes. Here, we propose a microstructural design strategy, by introducing a hierarchical nanolayered duplex-phase structure in the Zr-2.5Nb alloy, to effectively
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Hydrogen-enhanced deformation in pearlite Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Ranming Niu, Hanyu Li, Pang-Yu Liu, Patrick Burr, Yi Feng, Hung-Wei Yen, Chao Huang, Yi-Hsuan Sun, Mingtu Ma, Aimin Guo, Hongzhou Lu, Yi-Sheng Chen, Julie M. Cairney
Hydrogen-induced degradation of pipeline steels is a serious safety challenge for the transport of hydrogen. Steel pipes contain a large proportion of the pearlite phase, which consists of lamellar cementite in ferrite. How hydrogen interacts with pearlite and degrades the mechanical properties remains unclear. Here we have studied the deformation behavior of pearlite in the presence of hydrogen. In-situ
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From irregular to regular eutectic growth in the Al-Al3Ni system: In situ observations during directional solidification Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Paul Chao, Shanmukha Kiran Aramanda, Xianghui Xiao, Sabine Bottin-Rousseau, Silvère Akamatsu, Ashwin J. Shahani
We investigate the irregular eutectic growth dynamics of the Al-AlNi alloy, in which one of the solid phases (AlNi) grows faceted from the liquid. Leveraging in situ optical microscopy and synchrotron transmission x-ray microscopy, we address the question of the degree of coupling between Al and AlNi at the growth front and that of the shape of the microstructures left behind in the bulk solid during
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Stability of the B2 phase among refractory metals Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Junxin Wang, Ali Barooni, Maryam Ghazisaeidi
Energy efficiency demands finding new materials for applications at elevated temperatures. Refractory multicomponent alloys with a BCC/B2 microstructure promise to serve as alternatives to the current state-of-the-art, Ni-based superalloys for applications at higher temperatures. With the vast compositional space of these alloys, the first fundamental question is whether the B2 phase can form among
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Effects of surface anisotropy on the surface morphological response of plasma-facing tungsten Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Omeet N. Patel, Dwaipayan Dasgupta, Asanka Weerasinghe, Brian D. Wirth, Dimitrios Maroudas
Surface free energy has been hypothesized as the cause behind the experimental evidence (Parish et al., 2014) of a strong correlation between crystallographic orientation and surface morphology changes in helium ion-irradiated tungsten at the early stages of ‘fuzz’ growth in fusion plasma-facing tungsten. Here, this hypothesis is tested through self-consistent dynamical simulation based on an atomistically
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Near-bulk resistivity of sub-10nm Au films by breaking free from thickness downscaling effects Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Eunwook Jeong, Sang-Geul Lee, Seung Min Yu, Seung Zeon Han, Gun-Hwan Lee, Yoshifumi Ikoma, Eun-Ae Choi, Jungheum Yun
The miniaturization of electronic devices requires thin films with electrical conductivities that are comparable to those of bulk metals. However, ultrathin coinage metal films inevitably suffer from increased electrical resistivity compared with bulk metals, hindering their performance in miniaturized electronics. This study presents a novel approach to achieve near-bulk resistivity in sub-10-nm-thick
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Perpendicular magnetic anisotropy in multilayers arising from the interplay of thermal strains and diffusion-driven plastic deformation Acta Mater. (IF 8.3) Pub Date : 2024-08-22 A. Hromov, M. Panjan, M. Tadić, A. Zorko, M. Pregelj
Magnetic films with perpendicular magnetic anisotropy (PMA) are the basis for efficient memory-storage and future spintronic devices. PMA predominantly stems from surface effects, e.g., symmetry reduction, at the magnetic-layer interface and quickly decays with increasing layer thickness. Strong PMA is thus typically observed in sub-nanometer multilayers with alternating magnetic and noble metals.
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Fabrication of highly heterogeneous precipitate microstructure in an α/β titanium alloy Acta Mater. (IF 8.3) Pub Date : 2024-08-22 Yandi Jia, Huhu Su, Shuo Cao, Rongpei Shi, Yingjie Ma, Qian Wang, Sensen Huang, Ruixue Zhang, Qingmiao Hu, Yufeng Zheng, Shijian Zheng, Jiafeng Lei, Rui Yang
To obtain a synergistic combination of high strength and high ductility in titanium alloys, design and creation of heterogenous precipitate microstructure have attracted increasing attention. Herein, using Ti-3Al-5Mo-4.5V (wt.%, an titanium alloy) as a model alloy, we demonstrated that a highly heterogenous -phase precipitate microstructures with well-controlled length scale of spatial heterogeneity
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Treelike PS-PVD coating: Hierarchical branching by shading and sintering Acta Mater. (IF 8.3) Pub Date : 2024-08-21 Lu Huang, Mei-Jun Liu, Guan-Jun Yang, Chang-Jiu Li
A structure zone model (SZM) with columnar structures for conventional physical vapor deposition (PVD) has been assigned to plasma spray-physical vapor deposition (PS-PVD) coatings. However, many different comprehensive properties between PS-PVD and conventional PVD coatings reveal the essential different microstructures. In this work, an impact-diffusion model was established based on the impact and
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Atomistic Modelling of [formula omitted]-Fe2C Formation During Low-Temperature Tempering of Martensitic Carbon Steel Acta Mater. (IF 8.3) Pub Date : 2024-08-20 Felix K. Schwab, Mykola Lavrskyi, Renaud Patte, Helena Zapolsky
The control of carbide formation is crucial for the development of advanced steels. One of the more stable carbides occurring at room temperature ageing of martensite is -FeC. In this work, we study structural transformations which occur during low-temperature ageing in Fe-C martensite using computer modelling based on the atomic density field method. It is shown that homogeneous bct solid solution
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In situ observation of ferroelectric domain evolution of (K,Na)NbO3 single crystals during heating Acta Mater. (IF 8.3) Pub Date : 2024-08-19 Qinwen Guo, Chengpeng Hu, Xiangfei Li, Ying Meng, Luyao Wang, Haoyu Zhuang, Xi Shen, Hao Tian, Zhongxiang Zhou, Richeng Yu
Since the spontaneous polarization and domain switching is closely related with the physical properties of ferroelectric materials, significant research efforts have been carried out to understand domain switching under external fields. However, investigations on the evolution of ferroelectric domains under thermal fields have comparatively been limited. To elucidate the thermal stability of strain
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Strong interfaces: the key to high strength in nano metallic laminates Acta Mater. (IF 8.3) Pub Date : 2024-08-18 Yifan Zhang, Thomas J. Nizolek, Laurent Capolungo, Nan Li, John S. Carpenter, Rodney J. McCabe
Excellent mechanical properties of nanomaterials are usually attributed to their nanoscale feature size and high-density interfaces. This work explores the effects of intrinsic interface properties on mechanical properties of nano metallic laminates (NMLs). We show that the interface strength significantly affects the mechanical properties of NMLs. Via mechanical testing and characterization, we investigate
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Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension Acta Mater. (IF 8.3) Pub Date : 2024-08-18 Punit Kumar, Xueqian Gou, David H. Cook, Madelyn I. Payne, Nathaniel J. Morrison, Wenqing Wang, Mingwei Zhang, Mark Asta, Andrew M. Minor, Ruqing Cao, Yi Li, Robert O. Ritchie
The mechanical properties of the refractory high-entropy alloy (RHEA) NbMoTaW with columnar and equiaxed microstructures and a nanoscale metal oxide layer on the grain boundaries are investigated at ambient temperatures (RT) to 1200 °C. Under compression, the alloy shows a yield strength, , of ⁓1390 ± 20 MPa at RT and retains a high yield strength, , of ⁓301.5 MPa at 1200 °C. However, in tension, the
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Stress induced martensitic transformation in NiTi at elevated temperatures: Martensite variant microstructures, recoverable strains and plastic strains Acta Mater. (IF 8.3) Pub Date : 2024-08-18 O. Tyc, E. Iaparova, O. Molnárová, L. Heller, P. Šittner
To shed light on the origin of the loss of functional properties of NiTi with temperature increasing above 100 °C, we have investigated stress induced martensitic transformations in nanocrystalline NiTi shape memory wire by thermomechanical tensile testing supplemented with post-mortem reconstruction of martensite variant microstructures in grains by nanoscale orientation mapping in TEM. The stress
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A full-field approach for precipitation in metallic alloys. Comparison with a mean-field model Acta Mater. (IF 8.3) Pub Date : 2024-08-17 Mathilde Eymann, Michel Perez, Thibaut Chaise, Thomas Elguedj, Pierre-Antoine Geslin
Modeling precipitation in metallic alloys is a topic of great importance in physical metallurgy as the resulting strengthening strongly depends on the precipitate microstructure. We propose here a numerical full-field model for precipitation that describes precipitates with shape functions, thereby allowing to bridge scales between phase-field approaches - that accurately describe the precipitate evolution
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Bilayer period and ratio dependent structure and mechanical properties of TiN/MoN superlattices Acta Mater. (IF 8.3) Pub Date : 2024-08-17 Z. Gao, J. Buchinger, R. Hahn, Z. Chen, Z.L. Zhang, N. Koutná, P.H. Mayrhofer
Transition metal nitrides are widely used in the hard materials and protective coatings industry, but are limited by their low fracture toughness. Encouraged by previous studies on remarkable simultaneous improvements in strength and ductility through superlattice (SL) architectures, various TiN/MoN SL thin films were developed on MgO (100) substrates. By varying their bilayer periods (Λ) between 2
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Local charge distortion due to Cr in Ni-based concentrated alloys Acta Mater. (IF 8.3) Pub Date : 2024-08-17 Jacob Fischer, Dilpuneet S. Aidhy
Due to the presence of multiple elements consisting of a range of atomic radii, local lattice distortion (LLD) is commonly observed in concentrated (and high entropy) alloys. However, since these elements also have diverse electronegativities, recent works show that atoms can have a range of atomic charges. In this work, using density functional theory (DFT), we investigate electronic charge distribution
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Thermo-kinetic insights into deformation mechanism in the phase-transforming nanostructured Fe alloy Acta Mater. (IF 8.3) Pub Date : 2024-08-17 L.K. Huang, X. Liu, K. Niu, K.X. Song, F. Liu
Solid-state phase transformations (SSPTs) being the most widely versatile routes to tailor microstructures are less utilized in the design of nanostructured (NS) alloys, resulting in a lack of understanding of the significance of SSPTs in tuning mechanical properties. Here, we combine nanostructuring with reverse austenite transformation to make a phase-transforming NS Fe alloy consisting of ultrafine
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Investigating interfacial segregation of [formula omitted]/Al in Al–Cu alloys: A comprehensive study using density functional theory and machine learning Acta Mater. (IF 8.3) Pub Date : 2024-08-17 Yu Liu, Yin Zhang, Namin Xiao, Xingwu Li, Fu-Zhi Dai, Mohan Chen
Solute segregation at the interface between the aluminum (Al) matrix and the () phase decreases the interfacial energy, impedes the coarsening of precipitates, and enhances the thermal stability of such precipitates. In this study, we employ density functional theory to systematically calculate solute segregation energies of 42 solute elements at the coherent and semi-coherent interfaces between the