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Cryo-pre-straining contributes to achieving high yield strength in high-entropy alloys Intermetallics (IF 4.4) Pub Date : 2024-03-15 Cheng Tao, Chao Chen, Jiarui Fan, Wei Luo, Hailong Yi
In this study, we propose an effective and feasible strategy to significantly improve the room-temperature yield strength of the CoCrFeMnNi HEA by 338%, from 281 MPa (as-recrystallized, before CR) to 1231 MPa (30% CR) through cryo-pre-strain-inducing defects such as dislocations, stacking-faults (SFs), nano-twins, Lomer-Cottrell (L-C) locks, and HCP martensite, while maintaining good ductility (16
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Creep deformation and damage behavior of an alumina-forming austenitic alloy strengthened by intermetallic compounds Intermetallics (IF 4.4) Pub Date : 2024-03-15 Ling Liu, Benjamin Giron-Palomares, Fuxiao Chen, Hongying Sun, Junqing Guo
Based on Fe–30Ni–15Cr, a new alumina-forming austenitic (AFA) alloy, free of carbon, was designed for potential use in ultra-supercritical generator set. The creep behavior of alloy has been investigated by analyzing the creep constitutive equation, creep damage tolerance factor (λ), microstructure images, and oxide layer structure under different stresses at 750 °C. The creep microstructure and oxide
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Exploring mechanical properties and diffusion paths in Al–Co–Ni diffusion multiples fabricated through spark plasma sintering Intermetallics (IF 4.4) Pub Date : 2024-03-14 Yang Zhou, Yanna Cui, Yihan Hu, Ming Li, Fei Zhou, Jiamiao Liang, Jun Wang
The diffusion multiple containing Ni–NiAl–Co alloys was fabricated using spark plasma sintering technique. The microstructure, mechanical properties and diffusion behavior were evaluated under annealing conditions of 1100 °C and 800 °C. The results suggest that spark plasma sintering proves to be an efficient processing approach in producing well-welded diffusion multiples in Al–Co–Ni based alloys
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Identifying low-cost, machinable, impact-resistant TiAl alloys suitable for last-stage turbine blades of jet engines Intermetallics (IF 4.4) Pub Date : 2024-03-13 Toshimitsu Tetsui
Existing TiAl alloys used for fabricating last-stage turbine blades of jet engines are relatively cost-prohibitive and unreliable, particularly for use in next-generation engines. The present study was conducted to address these issues by uncovering new TiAl alloy compositions with a focus on improving machinability and impact resistance. Ternary alloys integrated with V or Cr were examined and compared
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Effect of Re addition on microstructure, properties, and performance of AlMo0.5NbTa0.5TiZr refractory high entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-03-11 Milad Zohrevand, Mohammadreza Mokhtare, Amir Momeni, Saeed Sadeghpour, Mahesh Somani
The AlMoNbTaTiZr refractory high-entropy alloy (RHEA) is one of the prominent systems that has recently attracted significant attention mainly due to its significant high-temperature strength. In this study, the effect of Rhenium (Re) addition on microstructure, chemical composition, mechanical properties, corrosion behavior, and high-temperature oxidation characteristics of this alloy has been investigated
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Growth kinetics of intermetallic compounds in Cu–Ti diffusion couples Intermetallics (IF 4.4) Pub Date : 2024-03-10 Chao Liu, Zhiyi Song, Yonggang Fan, Vladimir Efimovich Rogalin, Cong Wang
Cu–Ti diffusion couples have been designed in the temperature range from 1013 K to 1163 K. Ensuing intermetallic compounds, including CuTi, CuTi, CuTi, and the elusive CuTi, have been identified in the diffusion zone. Growth kinetics and interdiffusion coefficients of involved Cu–Ti intermetallics have been quantified based on the measured compositional profiles using electro-probe microanalyzer. Moreover
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Polarity effect of interfacial intermetallic compounds of BGA structure Cu/Sn–52In/Cu solder joints during electromigration Intermetallics (IF 4.4) Pub Date : 2024-03-07 Jiaqiang Huang, Yunhui Zhu, Kunhong Pan, Xudong Wang, Zhaoling Huang, Dawei Xiao, Hongjie Jiang
Sn–52In eutectic solder has gradually attracted much attention due to the feature of low melting temperature in recent years. However, Sn–52In solder may occur melting due to the severe Joule heating and causes serious reliability problems. This study mainly investigated the interfacial reaction of ball grid array (BGA) structure Cu/Sn–52In/Cu solder joints during electromigration with current densities
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Microstructure and martensitic transformation in Ni25Ti25Hf25Cu25 medium entropy shape memory alloy Intermetallics (IF 4.4) Pub Date : 2024-03-06 Q.Z. Li, H.Y. Wang, A.V. Shuitcev, B.H. Wang, L. Li, Y.X. Tong
NiTiHfCu medium entropy shape memory alloy (MESMA) exhibit reversible B2↔B19′ martensitic transformation. Martensitic morphology is represented by (011) type I twins with low density of inner (001) compound twins. In a bending test, NiTiHfCu exhibits reversible strain of 2.4% under stress of 300 MPa.
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Unleashing the microstructural evolutions during hot deformation of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-03-06 J. Charkhchian, A. Zarei-Hanzaki, T.M. Schwarz, R. Lawitzki, G. Schmitz, N. Schell, Jiajia Shen, J.P. Oliveira, Daudi Waryoba, H.R. Abedi
Many applications with potential use of high entropy alloys (HEAs) involve thermo-mechanical processing. The principal aim of this study is to elucidate the deformation mechanisms of the as-cast AlCoCrFeNi eutectic high entropy alloy (EHEA) at elevated temperatures. This investigation involves considering the interplay between phase transformations affecting microstructural evolutions and restoration
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The growth behavior and kinetics of intermetallic compounds in Cu–Al interface at 600°C–800 °C Intermetallics (IF 4.4) Pub Date : 2024-03-05 Dandan Zhao, Weijia Guo, Zhichao Shang, Chengyi Xu, Xinran Gao, Xiaohong Wang
Due to the low production cost and light weight, copper-clad aluminum conductors show great potential value in the field of power transmission, while the phase structure and organizational changes at the Cu–Al interface in high-temperature environments have a great impact on the electrical and mechanical properties. In this paper, Cu–Al diffusion couples are prepared to study the diffusion process
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Effect of ball milling on the structure and electrochemical hydrogen storage properties of a RE-Mg-Ni alloy Intermetallics (IF 4.4) Pub Date : 2024-03-05 Guang Zeng, Tingting Zhai, Zeming Yuan, Pei Gao, Dianchen Feng
RE-Mg-Ni alloy is considered a highly promising anode material for the next generation of MH-Ni batteries. However, the low cycle life, fast performance, and high manufacturing cost of this ideal MH-Ni battery anode material have become obstacles to its optimization. In this work, an as-cast LaSmMgNiCo superlattice alloy was prepared by vacuum medium frequency induction melting. Then, LaSmMgNiCo +
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Phase equilibria and thermodynamics assessment of the Co–Fe–Nb ternary system Intermetallics (IF 4.4) Pub Date : 2024-03-04 Yohanes Hutabalian, Gita Novian Hermana, Andromeda Dwi Laksono, Sinn-wen Chen
The Co–Fe–Nb materials system is a crucial material for magnetic applications. Despite its importance, the phase equilibria and thermodynamic characteristics of this ternary system have not been explored in detail. This study employs the Calphad method to model the phase equilibria of the Co–Fe–Nb ternary system. To obtain the ternary interaction parameters, the experimental data on the isothermal
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Magnetic structure analysis of the L21-type austenite in Ni–Mn–In alloys Intermetallics (IF 4.4) Pub Date : 2024-03-04 J. López-García, D.L.R. Khanna, J.L. Sanchez Llamazares, P. Álvarez-Alonso, P. La Roca, V. Recarte, V. Sánchez-Alarcos, J.I. Pérez-Landazábal, J.A. Rodríguez-Velamazán
In general, the magnetocaloric (MC) materials undergoing a magneto-structural transition (first order) have a higher MC effect than purely magnetic transition (second-order). However, the first order transformation displays thermal and magnetic hysteresis and reversibility problems. In this work we present an alternative way to improve the MC effect in Ni–Mn–In alloys, controlling magnetism in second-order
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Influence of C14 Laves phase and Zr-rich phase interactions on the hydrogen storage properties of Ti32.5V27.5Zr7.5Nb32.5 high entropy hydrogen storage alloy Intermetallics (IF 4.4) Pub Date : 2024-03-03 Guanglong Li, Yue Li, Jian Liang, Zhen Wen, Tong Zhang, Xin Ding, Yingdong Qu
TiVZrNb high entropy alloys possesses excellent hydrogen storage properties as hydrogen storage materials. This is due to the fact that all four elements are composed of hydrogen-absorbing elements with large differences in atomic size. In this study, the effects of C14 Laves phase content and Zr element distribution on the hydrogen storage properties of TiVZrNb alloy with different heat treatment
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Low cycle fatigue performances of Al0.3CoCrFeNi high entropy alloys: In situ neutron diffraction studies on the precipitation effects Intermetallics (IF 4.4) Pub Date : 2024-03-02 Zongyang Lyu, Chuhao Liu, Di Xie, Rui Feng, Dunji Yu, Yan Chen, Ke An, Yanfei Gao, Huamiao Wang, Peter K. Liaw
Fatigue properties are essential for structural materials in industrial applications. High-entropy alloys are promising fatigue-resistant alloys with high strengths and good ductilities. In this study, the B2 precipitate significantly increased the yield strength of the AlCoCrFeNi high-entropy alloy but at the same time decreased the low-cycle fatigue life. A detailed investigation of the underlying
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Effects of molybdenum content and heat treatment on hydrogen evolution reaction properties and microstructure of FeCoCrNiMox high entropy alloys Intermetallics (IF 4.4) Pub Date : 2024-03-02 Qiankun Zhang, Mengmeng Du, Yifeng Xiao, Liang Wu, Jinwen Qian, Can Zhang, Yuehui He
The preparation of efficient and long-lasting electrocatalysts with low cost is crucial for hydrogen production by water electrolysis. Here, a series of high-entropy alloys (HEAs) of FeCoCrNiMo (x = 0, 0.5, 1, 1.5, and 2) were created by arc melting method and enhanced by heat treatment according to various schedules. The microstructure transitioned from the FCC phase to the FCC + σ phase and finally
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Intermetallic eutectics with gigapascal strength and enhanced ductility Intermetallics (IF 4.4) Pub Date : 2024-03-01 Vilas Gunjal, Chandra Sekhar Tiwary, Kamanio Chattopadhyay, Dipankar Banerjee
The Ni–Al–Zr system offers a variety of intermetallic eutectic combinations. Here, we demonstrate complex eutectic microstructures consisting of intermetallic i.e. NiAl–NiZr, NiAl–NiZr, and NiAl–NiAl–NiZr. We also developed alloys with different fractions of two eutectics i.e. NiAl–NiZr, NiAl–NiZr. These microstructures result in attractive combinations of ultra-high tensile strength of more than 1
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Hot deformation behavior analysis of as-cast CoCrFeNi high entropy alloy using Arrhenius-type and artificial neural network models Intermetallics (IF 4.4) Pub Date : 2024-02-29 M. Karimzadeh, M. Malekan, H. Mirzadeh, N. Saini, L. Li
An as-cast equiatomic CoCrFeNi high entropy alloy was investigated through hot compression tests conducted at various temperatures ranging from 700 to 1000 °C and different strain rates ranging from 0.001 to 0.1 s. The flow stress curves were analyzed and modelled using both Arrhenius-type hyperbolic-sine relationship and artificial neural network (ANN) modeling. While the Arrhenius-type modeling yielded
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A novel mechanochemical synthesis of ferromagnetic Fe3Al nanoparticles and preparation of its polyaniline nanocomposite Intermetallics (IF 4.4) Pub Date : 2024-02-29 M. Mohammadi, S.A. Kahani
Iron aluminide FeAl nanostructures were synthesized by chemical reduction of iron(II) chloride via aluminum nanoparticles in the solid state. Aluminum nanoparticles (AlNPs) were prepared by a novel wire drawing method in the presence of lubricating oil. Chemical reduction of iron(II) salts in aqueous solution by metallic aluminum has a many mechanistic considerations. These mechanistic aspects were
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Mechanical properties and deformation mechanisms of C-doped interstitial high-entropy alloy CrMnFeCoNi: Effects of strain rate and C content Intermetallics (IF 4.4) Pub Date : 2024-02-28 Q. Liu, B. Li, C.H. Yi, C.H. Mi, J.Y. Hua, J.C. Yuan, X.J. Zhao, L. Lu, N.B. Zhang
The effects of strain rate on mechanical properties, microstructural evolution and underlying deformation mechanisms of two kinds of interstitial CrMnFeCoNi high entropy alloys (HEAs), (CrMnFeCoNi)C and (CrMnFeCoNi)C, are investigated under quasi-static and dynamic tension. Dynamic loading is carried out via a split Hopkinson tension bar system. The pre- and post-deformation microstructures are characterized
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Multistage strain hardening facilitated by in-situ TiO(C) nanoparticles in CoCrFeMnNi high entropy nanocomposite subjected to high strain rate compression Intermetallics (IF 4.4) Pub Date : 2024-02-26 Zhen Zhang, Yuehuang Xie, Jiamiao Liang, Yang Zhou, Sammy Lap Ip Chan, Jun Wang
Second phase nanoparticles have been notable reinforcements to enhance strength of high entropy alloys based on Orowan mechanism, but their contributions to improving strain hardening ability through facilitating deformation behaviors are still unclear. In this study, an in-situ TiO(C) nanoparticles reinforced CoCrFeMnNi high entropy nanocomposite was fabricated through powder metallurgy routes. The
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Effect of Mn addition on microstructure and corrosion behavior of AlCoCrFeNi high-entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-02-23 Dandan Zhang, Qiang Li, Rongze Sun, Chuntao Chang, Bin Liu, Xu Ma
In this study, the effects of Mn content on the microstructure and corrosion resistance of AlCoCrFeNiMn (x = 0, 0.25, 0.5, 0.75, and 1) high-entropy alloys were investigated. The results indicate that with increasing Mn content, the HEAs consistently comprise nanophase BCC geometry with different shapes embedded in the ordered B2-phase matrix, and the morphology of the microstructure changes from a
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Study on properties of MnAlC magnetic powder and bulk Intermetallics (IF 4.4) Pub Date : 2024-02-21 Xiangpeng Chang, Chao Shi, Lunjia Du, Lin Luo, Donglin Guo, Yilong Ma, Chunhong Li
The magnetic properties of MnAl are improved by doping C to stabilize the magnetic phase. In this work, a method to prepare high performance MnAlC magnetic powder and bulk is presented. This enhances the potential of MnAl to replace rare earth permanent magnet material. The phase composition, microstructure and magnetic properties of the samples were measured and studied. After annealing and tempering
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Manufacture and characterization of RE2Co (RE=Gd, Ho) amorphous alloys with excellent magnetic entropy change Intermetallics (IF 4.4) Pub Date : 2024-02-21 J.B. Jia, Y.S. Du, G. Fu, X.F. Wu, J.Q. Deng, G. Cheng, J. Wang, J.T. Zhao, G.H. Rao
The structure, low-temperature magnetic transition behaviors, and magnetocaloric properties of rare-earth-based binary RECo (RE = Gd, Ho) amorphous alloys were studied. With the increase of temperature, the amorphous alloys undergo a phase transition from the ferromagnetic state to the paramagnetic state. In the paramagnetic region, the reciprocal magnetic susceptibilities of GdCo obey the Curie-Weiss
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Microstructure evolution and characteristics of laser cladding with pre-placed powder lightweight refractory NbxMo0.5Ti1.5Ta0.2Cr high-entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-02-20 C.Y. Cui, H.H. Xu, F.Y. Ye, J. Yang, X.G. Cui
Lightweight refractory high-entropy alloy coatings (RHEAcs) of NbMoTiTaCr (where x = 1, 1.3, 1.5, and 2) were fabricated on the surface of 316L stainless steel using pre-placed powder laser cladding (LC) technology. A comprehensive study was conducted to elucidate the effect of Nb content on the microstructure, microhardness and wear resistance of NbMoTiTaCr RHEAcs before and after annealing at 900 °C
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Thermoelectric properties of iso-valent Bi substituted n-type Ti2NiCoSnSb high entropy alloys Intermetallics (IF 4.4) Pub Date : 2024-02-20 B.S. Subathra, Madhuvathani Saminathan, Prince Wesley, Lokeshwaran Ravi, Manjusha Battabyal, Debattam Sarkar, Suresh Perumal, Ravikirana
High entropy alloys have captivated so much attention in the field of thermoelectric due to their superior electrical, thermal, and mechanical properties. In this work, we report improved thermoelectric properties of TiNiCoSnSbBi high entropy alloy, synthesized by vacuum arc melting followed by ball milling and induction hot-press. Powder X-ray diffraction pattern confirmed the C1 structure and solubility
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Regulation of phase partition and wear resistance for FeCoCrV high entropy alloy by heat treatment Intermetallics (IF 4.4) Pub Date : 2024-02-17 Jiahui Shen, Jing Hu, Xulong An
In this research, FeCoCrV high entropy alloy was prepared by casting and cold rolling, and heat treatment was used to control the phase partition of FeCoCrV alloy. Meanwhile, the wear resistance of FeCoCrV alloy under different phase partition was investigated. Metallographic microscope, X-ray diffractometer, Vickers microhardness tester and friction and wear testing machine were used to analyze the
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Effect of low-energy mechanical activation (LEMA) on the morphology of 3Ni/Al powder and the synthesis of Ni3Al intermetallic compound Intermetallics (IF 4.4) Pub Date : 2024-02-14 Oleg V. Lapshin, Evgeny N. Boyangin
The effect of low-energy mechanical activation (LEMA) of 3Ni/Al powder on the explosive synthesis of NiAl intermetallic compound was studied experimentally. LEMA time was varied between 0 and 50 h. Mechanical forces were found to be essential in the deformation-induced reorganization of the powder's morphological structure. An anomalous decrease of the critical ignition temperature in the mixture up
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Ni2NbSn Heusler ferromagnetic superconductor: Magneto-structural and transport characterisation Intermetallics (IF 4.4) Pub Date : 2024-02-14 Samuel Nalevanko, Jozef Kačmarčík, Ladislav Galdun, Andrea Džubinská, Michal Varga, Gabriel Sučík, Pavel Diko, Marián Reiffers, Rastislav Varga
This work presents the preparation and characterisation of the multifunctional Heusler alloy. The alloy was prepared using arc melting in the form of an ingot showing an Heusler structure. The resistance measurements confirmed the superconductive character of the alloy with the critical temperature of = 3.00 K and the upper critical magnetic field of μ = 0.69 T. Magnetic measurements confirmed strong
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Comparison of microstructure, mechanical properties and biocompatibility of CoCrFeNiMn high-entropy alloy with 316L stainless steel Intermetallics (IF 4.4) Pub Date : 2024-02-14 Hamed Shahmir, Nebras Kamel Falih Al-Asadi, Zuhair Jabbar Abdul Amir Bani-Asad
The present investigation was conducted to compare CoCrFeNiMn high-entropy alloy as a new class of material with conventional 316L stainless steel. The alloys were processed by cold rolling followed by short-term annealing to achieve a single-phase microstructure with fine grains and represent high strength and ductility with an ultimate tensile stress more than 600 MPa and an elongation to failure
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L12-phase nano-structures and their stabilities in dilute Al–Zr–Y alloys: A first-principles study Intermetallics (IF 4.4) Pub Date : 2024-02-13 Shijia Wang, Jiangang Yao, David Dawei Jiang, Xuan Xie, Yiren Wang, Yong Jiang
We present an interface-level first principles study on the formation of L1-phase nano-structures in dilute Al-Zr-Y alloys. All energetics, relevant to bulk substitution, interface formation, interfacial coherent strain and segregation, were calculated and used to evaluate the nucleation and relative stabilities of various possible L1 nano-structures. The following new insights were obtained. Only
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The rheological behavior and constitutive model of Zr35Ti30Be27·5Cu7.5 metallic glass under high strain rate tensile conditions within the supercooled liquid region Intermetallics (IF 4.4) Pub Date : 2024-02-09 Mingda Si, Pan Gong, Hu Huang, Jianhua Mo, Xinyun Wang
Tensile rheological behavior of the ZrTiBeCu metallic glass under conditions of high strain rates (strain rates ranging from 0.05 s to 0.5 s) within the supercooled liquid region was studied. The stress-strain curve reveals that this metallic glass demonstrates non-Newtonian flow characteristics under these circumstances. The peak stress associated with stress overshoot increases as temperature decreases
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High uniformity of the mechanical properties of arc-melted WNbMoTaZr refractory high entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-02-03 Chong Li, Shunhua Chen, Xin Chen, Xiaokang Yue, Jiaqin Liu, Junsheng Zhang, Yucheng Wu
Elucidation of the variations of microstructure and mechanical properties of arc-melted refractory high entropy alloys (RHEAs) is important before their widespread practical applications. In this work, the uniformity of the mechanical properties of arc-melted WNbMoTaZr RHEA was investigated based on Weibull statistics under varying conditions. The results indicated that despite the significant variations
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Fast cooling rate enhances impact toughness in tungsten fiber-reinforced metallic glass composites Intermetallics (IF 4.4) Pub Date : 2024-02-03 Y.Z. Wu, C.B. Jin, M.Y. Tan, F.C. Wang, Y.H. Gao, J. Xu, Z.W. Shao, Z. Ren, Y. Zhang, J.Q. Wang, J.T. Huo, M. Gao
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Precipitation hardening characterization and stress prediction model in electrically-assisted Ti2AlNb uniaxial tension Intermetallics (IF 4.4) Pub Date : 2024-02-03 Xudong Cao, Dayong An, Qing Liu, Guoqing Chen, Xifeng Li
In this study, we reported the ultrafast precipitations of O phase in TiAlNb alloy caused by pulse current in the range of 450°C–750 °C, which results in an abnormal increase of strength with increasing temperature in electrically-assisted uniaxial tension. The morphology of precipitate phase is controlled by the increase in thermal and non-thermal free energy with increasing pulse current. The elongated
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Explainable Machine Learning based approach for the design of new refractory high entropy alloys Intermetallics (IF 4.4) Pub Date : 2024-02-02 Saswati Swateelagna, Manish Singh, M.R. Rahul
The design and development of Refractory High Entropy Alloys can be expedited using Machine Learning (ML) approach. The current study uses a RHEA database to train the different Machine Learning models, namely, Decision Tree (DT), Random Forest (RF), Support Vector Machine (SVM), K-nearest neighbor (KNN) and Artificial Neural Network (ANN). The trained models show an average testing accuracy of more
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Strain-hardening and failure mechanisms of metallic glasses under triaxial stress Intermetallics (IF 4.4) Pub Date : 2024-01-31 Rutong Wan, Zhilin Long, Yuxuan Cui
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Study of Re strengthening mechanisms in nickel-based superalloy Intermetallics (IF 4.4) Pub Date : 2024-01-31 Xiaowei Li, Minsheng Huang, Lv Zhao, Shuang Liang, Yaxin Zhu, Zhenhuan Li
Re doping is an essential way to improve the high temperature mechanical properties of nickel-based single crystal superalloy (NBSCS). However, how the doped Re affects the mechanical properties of NBSCS is still unclear, and a quantitative description is lacking. This paper attempts to study the influence of Re doping on plastic deformation mechanisms of NBSCS at atomic scale. First, the grand-canonical
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Ductile Fe-based amorphous alloy with excellent soft magnetic properties induced by low-temperature stress annealing Intermetallics (IF 4.4) Pub Date : 2024-01-30 X.S. Li, F.C. Su, J. Zhou, Y.C. Mao, J.M. Yang, Z.Y. Xue, H.B. Ke, B.A. Sun, W.H. Wang, H.Y. Bai
The soft magnetic properties of Fe-based amorphous alloys can be greatly improved by stress relief annealing below its crystallization temperature. However, the structural relaxation during annealing results in the decrease of free volume, which leads to the tough-brittle transition of the alloy. In this work, we successfully reducing the coercivity and brittleness simultaneously by designing a stress
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Effect of transition-metals (Fe, Co and Ni) on the L12-phase strengthening in the Al0.3CrFeCoNi high-entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-01-24 Shiyu Xu, Lin Hong, Siyi Wu, Yuan Qin, Sen Yang, Ming Huang
L12-strengthened high-entropy alloys have become research of interest for their great potential to achieve a superb balance between ductility and strength. While much attention has been paid to strong L12-phase forming elements, little discussion has focused on the role of transition-metals. The concentration of Fe, Co, and Cr in the Al0.3CrFeCoNi alloy was decreased to investigate how transition-metals
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Roles of Cu in Fe-based soft magnetic nanocrystalline alloys with high Fe content Intermetallics (IF 4.4) Pub Date : 2024-01-24 Lingxiang Shi, Yang Shao, Jili Jia, Chenyu Lu, Kefu Yao
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Hot deformation behavior and processing map of novel quasi-network Ti5Si3/TiAl composites Intermetallics (IF 4.4) Pub Date : 2024-01-24 Naonao Gao, Xiping Cui, Jiawei Luo, Xiangxin Zhai, Taiquan Zhang, Zhiqi Wang, Yuanyuan Zhang, Hao Ding, Junfeng Chen, Lin Geng, Lujun Huang
The in-house fabricated quasi-network Ti5Si3/TiAl composites showed an excellent combination between light weight and superior high temperature tensile properties in our previous work. However, the deformability was another key factor which determined the Ti5Si3/TiAl composites’ potential for high temperature applications in aeronautics and aerospace. Therefore, in this paper the hot deformation behaviors
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XGBoost algorithm-assisted prediction of amorphous formability of Fe-based nanocrystalline precursor Intermetallics (IF 4.4) Pub Date : 2024-01-25 Yu Han, Gan Zhang, Fuyao Yang, Yaqiang Dong, Aina He, Jianfei Cao
The completely amorphous structure in the precursor is a significantly important prerequisite for obtaining the perfect amorphous-nanocrystalline duplex structure and the excellent soft magnetic properties of Fe-based nanocrystalline alloy ribbons (FNR). However, the correlation between the amorphous formability (AFA) and the key parameters of FNR precursors is not clear. Herein, a data-preprocessed
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Hot corrosion of Fe-Cr-Ni multi-principal element alloys in Na2SO4+25%NaCl mixture salts at 700–900°C Intermetallics (IF 4.4) Pub Date : 2024-01-22 Haofei Sun, Jing Liu
This study investigates the hot corrosion of two multi-principal element alloys (MPEAs) and two commercial alloys when exposed to Na2SO4+25%NaCl at high temperatures ranging from 700 to 900 °C in ambient air. Above 800 °C, FeCrNi and FeCrNiCoMn exhibit superior corrosion resistance compared to 310S and Inconel 625. High concentrations of Fe and Ni in commercial alloys prove detrimental to hot corrosion
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Investigating the structural properties of a novel soft magnetic Fe-based amorphous alloy by dynamic mechanical relaxation Intermetallics (IF 4.4) Pub Date : 2024-01-23 Parisa Rezaei-Shahreza, Saeed Hasani, Amir Seifoddini, Marcin Nabiałek, Pawel Czaja, Agata Śliwa
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Influence of γ′ precipitate on impact toughness and tensile properties of a new Fe–Ni-based superalloy Intermetallics (IF 4.4) Pub Date : 2024-01-22 Yeshun Huang, Rui Zhang, Zijian Zhou, Peng Zhang, Jingbo Yan, Yong Yuan, Yuefeng Gu, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun
The influence of γ′ precipitate on tensile properties and impact toughness of a new Fe–Ni-based alloy HT700P applied in 700 °C advanced ultra-supercritical power plants was investigated via different heat treatments. The yield strength increased first and then decreased gradually with increasing fraction and diameter of γ′ particles, while elongation and toughness exhibited an inverse relationship
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Effect of Nb addition and annealing treatment on structural and magnetic properties of Fe–Si–B–P–Cu alloy ribbons Intermetallics (IF 4.4) Pub Date : 2024-01-18 Hyunkyung Lee, Hyunsol Son, Haein Choi-Yim
Thermal and magnetic properties of Fe85-xSi2B8P4Cu1Nbx (0 ≤ x ≤ 4) alloy ribbons of different microstructures were systematically investigated. Increase in Nb content raised the first crystallization onset temperature from 646 to 701 K suggesting improved thermal stability. XRD results on the as-spun ribbons also suggested the role of Nb increasing the thermal stability and glass-forming ability by
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Tailoring the non-coherent interfacial precipitation to overcome the trade-off between strength-ductility and impact energy release in Ti–Zr–Hf–Nb–Ta high entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-01-17 Guanglin Liu, Dong Xu, Haoyan Yang, Fuxin Liu, Benpeng Wang, Liang Wang, Xun Guo, Mingbin Sui, Lu Wang, Yunfei Xue
The energetic high-entropy alloys have brought a new idea for the development of new energetic structural materials (ESMs) with high energy density and excellent mechanical properties. However, the energetic high-entropy alloys exhibit a significant trade-off between strength-ductility and impact energy release efficiency. Here, we develop a new strategy to introduce non-coherent interfacial nanoprecipitates
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Enhancement of strength-plasticity synergy in a graphene metallic glass composite Intermetallics (IF 4.4) Pub Date : 2024-01-17 Yiliang Liu, Dongmei Li, Qixin Chen, Benzhen Tang, Lei Xia, Ding Ding, Peng Yu
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Improved LBE corrosion resistance of the FeCrAl coating by the addition of trace Si element Intermetallics (IF 4.4) Pub Date : 2024-01-19 Wei Zhang, Mingyang Zhou, Jiuguo Deng, Yilong Zhong, Huifang Yue, Danmin Peng, Yi Zhou, Ning Liu, Jijun Yang
Three kinds of FeCrAlSi coatings with different Si contents were prepared by the magnetron sputtering method, and the LBE corrosion resistance was investigated at 500 °C, 550 °C, and 600 °C for 1000 h. The results showed that the corroded coatings present a shiny surface (circle morphology). The increase of Si content promotes the thinning of the total oxide scale and thickening of the Al2O3 layer
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Effect of non-metallic carbon content on the microstructure and corrosion behavior of AlCoCrFeNi high-entropy alloys Intermetallics (IF 4.4) Pub Date : 2024-01-15 Yi Wang, Guanglong Li, Hao Qi, Wei Zhang, Ruirun Chen, Ruiming Su, Bo Yu, Yingdong Qu
The addition of carbon has been reported to improve the corrosion resistance of various alloys. However, few studies have investigated the effect of non-metallic elements on the corrosion behaviour of AlCoCrFeNi high-entropy alloys (HEAs), which are among the most extensively developed alloys and potential alternatives to structural materials. Therefore, herein the microstructure and corrosion behaviour
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Effect of hydrogen on thermal deformation behavior and microstructure evolution of MoNbHfZrTi refractory high-entropy alloy Intermetallics (IF 4.4) Pub Date : 2024-01-12 Xiangyang Shen, Feng Liu, Jinyuan Guan, Fuyu Dong, Yue Zhang, Zihe Guo, Ye Yuan, Binbin Wang, Liangshun Luo, Yanqing Su, Jun Cheng, Xiaoguang Yuan, Peter K. Liaw
The study examined the thermal-deformation behavior of an MoNbHfZrTi refractory high-entropy alloy (RHEA), which were hydrogenated using a liquid hydrogenation method and then subjected to high-temperature uniaxial compression in the deformation temperature range of 1100–1250 °C and strain rate range of 0.5–10−3 s−1. Test results showed that: (1) When the deformation temperature was between 1100 and
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Microstructure evolution and its effect on corrosion behavior during cold rolling of Ti–Nb–Ni sheet as bipolar plates substrate for PEMFC Intermetallics (IF 4.4) Pub Date : 2024-01-11 Haifeng Zhu, Xiaopeng Wang, Wei Meng, Pingwen Ming, Fei Yang, Fantao Kong
In this work, hot rolled Ti–Nb–Ni sheet with thickness of 1.8 mm was subjected to cold rolling with different reductions (20 %, 40 %, 60 %, 75 % and 85 %). Microstructure evolution and corrosion resistance of sheets with and without being cold rolled were investigated. Mechanical twins are generated for 20 % and 40 % cold rolled sheets, while dislocation slip becomes dominant for reductions larger
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Enhanced mechanical properties of high pressure solidified CoCrFeNiMo0.3 high entropy alloy via nano-precipitated phase Intermetallics (IF 4.4) Pub Date : 2024-01-11 Duo Dong, Wentao Jiang, Xiaohong Wang, Tengfei Ma, Dongdong Zhu, Ye Wang, Juntao Huo
CoCrFeNiMo0.3 high entropy alloy was prepared by vacuum arc melting. The effects of different solidification pressures on the microstructure and mechanical properties of CoCrFeNiMo0.3 high entropy alloy were investigated. All ambient pressure (0.1 MPa) Mo0.3, 4 GPa Mo0.3 and 7 GPa Mo0.3 alloys exhibit two kinds of structures. The FCC structure is the solid solution matrix, and the precipitated phase
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Tailoring the solidification microstructure and properties of Cu–12Sn-xBi-2Ni alloys by varying Bi content Intermetallics (IF 4.4) Pub Date : 2024-01-12 Jia Sun, Mingfei Wang, Bo Peng, Jinchuan Jie, Bowen Dong, Guoliang Li, Tingju Li
A novel self-lubricating Cu–12Sn-xBi-2Ni alloy was developed and the effect of Bi on microstructure and properties of Cu–12Sn-xBi-2Ni was investigated. The formation reason of the solidification microstructure was analyzed by CALPHAD method and verified by water quenching experiment. The mechanical properties and the friction properties of alloys were tested by the pin-on-disc wear tester and electronic
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“Tailoring thermal stability and in-plane magnetic anisotropy of CoFeB alloy thin films via growth conditions engineering” Intermetallics (IF 4.4) Pub Date : 2024-01-12 Neha Gupta, Mukul Gupta, D. Kumar, Sanjay Rai, Pooja Gupta
The present work investigates the influence of growth conditions on the magneto-structural properties of magnetron-sputtered CoFeB alloy thin films. Films grown at room temperature (RT) are soft magnetic (coercivity <9 Oe), show amorphous microstructure, and possess a distinct uniaxial magnetic anisotropy (UMA) in the film plane. The amorphous microstructure and UMA persist up to a growth temperature
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Magnetic properties of an Fe-based amorphous soft magnetic composite prepared via in-situ steam oxidation Intermetallics (IF 4.4) Pub Date : 2024-01-13 Yidong Wu, Zhao Dong, Ningning Shen, Yuluo Li, Suo Zhang, Fushan Li, Yaqiang Dong, Xidong Hui
Reducing the core losses of motors and transformers is an important way to address the global environment and energy resource problems. Soft magnetic composites (SMCs) comprising of electrically insulated ferromagnetic powder has shown vast potential for applications at low to high applied frequencies. In this work, in-situ steam oxidation was used to coat the surface of amorphous Fe75.5Si4B6P8C6Mo0
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Unraveling influence of entropy on thermal stability and glass-forming ability of (Fe, Co)–(Ta)–B amorphous alloys: Insights from local atomic structure simulated by ab initio molecular dynamics Intermetallics (IF 4.4) Pub Date : 2024-01-07 Liliang Pan, Yanhui Li, Mao Cheng, Shuang Ma, Xinyu Duan, Takeshi Wada, Hidemi Kato, Wei Zhang
The thermal stability, glass-forming ability (GFA), and local atomic structure of (Fe, Co)–(Ta)–B amorphous alloys with different entropy values were investigated by experiments and ab initio molecular dynamics simulations, and the effects of entropy were elaborated from the perspective of the local atomic structure. The experimental results show that crystallization temperature, activation energy
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Machine-learning assisted design of as-cast NiCoFeCrAlTi multi-principal element alloys with tensile yield strength over 1.35 GPa Intermetallics (IF 4.4) Pub Date : 2024-01-09 Y. Shi, X.W. Liu, S.N. Lan, N. Gao, S.M. Yin, W. Guo, Z.T. Fan, K. Wang
As-cast alloys have the advantage of short forming processes, but there is currently a lack of research on systematic design alloys with better mechanical properties. Herein, combining a machine-learning with random forest model algorithm, a high-throughput alloy design framework under multidimensional constraints was used to discover new NiCoFeCrAlTi multi-principal element alloys (MPEAs) for superior