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Recent Progress in Metallurgical Bonding Mechanisms at the Liquid/Solid Interface of Dissimilar Metals Investigated via in situ X-ray Imaging Technologies Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-27 Zongye Ding, Naifang Zhang, Liao Yu, Wenquan Lu, Jianguo Li, Qiaodan Hu
The liquid/solid (L/S) interface of dissimilar metals is critical to the microstructure, mechanical strength, and structural integrity of interconnects in many important applications such as electronics, automotive, aeronautics, and astronautics, and therefore has drawn increasing research interests. To design preferential microstructure and optimize mechanical properties of the interconnects, it is
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Influences of Iridium and Palladium on Oxidation Resistance of PtAl Coating Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-24 Ling-Yi Qian, Jing Wang, Yun-Shan Guo, He Liu, Ze-Bin Bao
The overarching goal of present study is to investigate the effects of Ir and Pd additions on the oxidation behaviour of PtAl coatings. Prior to depositing standard PtAl coating, Ir layer was electroplated by IrBr3 aqueous solution while Pd layer was prepared using electroless deposition. Comparing with normal PtAl coating, cyclic oxidation tests were carried out on both the Ir- and Pd-modified aluminide
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Influences of the Texture Characteristic and Interdendritic LPSO Phase Distribution on the Tensile Properties of Mg–Gd–Y–Zn–Zr Sheets Through Hot Rolling Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-24 Bing Li, Ji Wu, Bugang Teng
The Mg–Gd–Y–Zn–Zr alloy sheets with different texture characteristics and distribution of the interdendritic long period-stacking ordered (LPSO) phases were fabricated through altering the final rolling reduction (FRR). The results showed that the texture characteristic was closely related to FRR and affected the tensile properties of the resulted sheets to some extent. The Schmid factor (SF) of the
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Effect of Interfacial Microstructure on Mechanical and Tribological Properties of Cu/WS 2 Self-lubricating Composites Sintered by Spark Plasma Sintering Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-23 Zhitao Yu, Minghui Chen, Qunchang Wang, Xiaolan Wang, Fuhui Wang
In this study, Cu/WS2 self-lubricating composites are fabricated by spark plasma sintering. Interfacial microstructure and its effect on mechanical and tribological properties are investigated. High sintering temperature at 850 °C promotes decomposition of WS2 and its following interfacial reaction with Cu to form Cu0.4W0.6 nanoparticles and Cu2S, enhancing mechanical properties as well as wear resistance
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Tribocorrosion Behavior and Degradation Mechanism of 316L Stainless Steel in Typical Corrosive Media Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-20 Liwen Tan, Zhongwei Wang, Yanlong Ma
The tribocorrosion behavior and degradation mechanism of 316L stainless steel, in four typically industrial corrosion media, under different potentials, were studied. The results indicated that they strongly depended on corrosion medium and electrode potential. When the potential increased from cathodic protection region to anodic region, corrosion was accelerated. It dramatically promoted mechanical
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Formation Mechanism of Nanoparticles in Fe–Cr–Al ODS Alloy Fabricated by Direct Oxidation Method Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-07 Fuzhao Yan, Jing Li, Yiyi Li, Liangyin Xiong, Shi Liu
This study presents the fabrication of 14Cr Fe–Cr–Al oxide dispersion strengthened (ODS) alloy by a direct oxidation process. In order to explain how oxide nanoparticles are formed in the consolidation process, the powders after oxidation are subjected to vacuum thermal treatment at high temperatures. Differential scanning calorimeter, X-ray photoelectron spectroscopy, scanning electron microscopy
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Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-07 Chongfeng Sun, Shengqi Xi, Xiaofeng Dang, Jianping Li, Yongchun Guo, Zhong Yang, Yaping Bai
In this paper, microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering processes. Corrosion resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further analyzed. During the mechanical alloying process, Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders
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Hydrothermal Preparation of Homogeneous Cobalt Oxide Nanomaterials as Stable Anodes for Superior Lithium Ion Batteries Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-07 Junke Ou, Shugen Wu, Hao Wang
In this study, uniform Co3O4 nanoparticles are prepared via a simple and facile hydrothermal synthesis without calcination treatment. When the Co3O4 nanomaterials are investigated as anodes for lithium ion batteries, a good electrochemical property is achieved. Particularly, the reversible capacity of the as-synthesized Co3O4 nanoparticle has a significant growth from 383 mAh g−1 of the initial cycle
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Dislocation Source and Pile-up in a Twinning-induced Plasticity Steel at High-Cycle Fatigue Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-04 Rendong Liu, Zhiyuan Liang, Li Lin, Mingxin Huang
Dislocation behaviour of a twinning-induced plasticity (TWIP) steel subjected to high-cycle fatigue tests is investigated in the present study. Grain boundaries are the important sources of dislocation generation during fatigue tests, contributing to the increase in dislocation density. Continuous emission of dislocations from grain boundaries is observed in many grains. Inclusions can sustain large
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Development of High Strength and Toughness Non-Heated Al–Mg–Si Alloys for High-Pressure Die-Casting Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-04 Ling-Yang Yuan, Pan-Wen Han, Ghulam Asghar, Bao-Liang Liu, Jin-Ping Li, Bin Hu, Peng-Huai Fu, Li-Ming Peng
Based on the 3 factors and 3 levels orthogonal experiment method, compositional effects of Mg, Si, and Ti addition on the microstructures, tensile properties, and fracture behaviors of the high-pressure die-casting Al-xMg-ySi-zTi alloys have been investigated. The analysis of variance shows that both Mg and Si apparently influence the tensile properties of the alloys, while Ti does not. The tensile
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Effect of Bimodal Grain Size Distribution on the Strain Hardening Behavior of a Medium-Entropy Alloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-03 Ibrahim Ondicho, Bernard Alunda, Fredrick Madaraka, Melody Chepkoech
The evolution of strain hardening behavior of the Fe50(CoCrMnNi)50 medium-entropy alloy as a function of the fraction of recrystallized microstructure and the grain size was studied using the Hollomon and Ludwigson equations. The specimens under study were partially recrystallized, fully recrystallized with ultrafine-grained microstructure, and fully recrystallized with coarse grains. The yield strength
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Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-03 Xiaosheng Zhou, Hao Chen, Chenxi Liu, Yongchang Liu
By tailoring the reverse austenite transformation behavior of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steels, the residual ferrite in ODS steels can be controlled. The reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite transformation. For the spark plasma sintered steels, both the amount and size
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High-Temperature Creep Behavior and Microstructural Evolution of a Cu-Nb Co-Alloyed Ferritic Heat-Resistant Stainless Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-03 Ying Han, Jiaqi Sun, Jiapeng Sun, Guoqing Zu, Weiwei Zhu, Xu Ran
The creep behavior of Fe–17Cr–1.2Cu–0.5Nb–0.01C ferritic heat-resistant stainless steel was investigated at temperatures ranging from 973 to 1123 K and stresses from 15 to 90 MPa. The evolution of precipitates after creep deformation was analyzed by scanning electron microscopy, energy dispersion spectrum, and transmission electron microscopy. The minimum creep rate decreased with the decrease in the
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Ductility Anisotropy Induced by Ferrite in Direct Laser Deposited 17-4 PH Steel: Combined Microstructure and Dislocation Density Simulation Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-02 Chuanfeng Wu, Junmei Chen, Zhiyuan Yu, Hao Lu, Chun Yu, Jijin Xu
The anisotropic ductility of a direct laser deposited 17-4 PH cubic part was investigated. Anisotropic elongations in the specimens from varied surfaces of the part were obtained: ~ 6.2%, ~ 1.5%, and ~ 4.5% in XY, YZ, and XZ samples, respectively. Furthermore, various orientations of ferrite were found in different specimens, taking the loading direction as reference. A finite element analysis depending
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Tensile Behavior of SiC Fiber-Reinforced γ -TiAl Composites Prepared by Suction Casting Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2021-01-02 Yingying Shen, Qing Jia, Xu Zhang, Ronghua Liu, Yumin Wang, Yuyou Cui, Rui Yang
The process of preparing SiC fiber-reinforced γ-TiAl composites by the conventional methods is difficult and complicated due to the high reactivity, high melting point and poor deformability of γ-TiAl alloys. In this work, suction casting, a promising method for preparing SiCf/TiAl composite, had been attempted. In the process, γ-TiAl alloy melt was introduced rapidly into a mold within pre-arranged
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Correction to: Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-12-01 Hua‑Zhen Jiang, Zheng‑Yang Li, Tao Feng, Peng‑Yue Wu, Qi‑Sheng Chen, Yun‑Long Feng, Long‑Fei Chen, Jing‑Yu Hou, He‑Jian Xu
Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting.
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Preparation and Photoelectric Properties of Patterned Ag Nanoparticles on FTO/Glass Substrate by Laser Etching and Driving Layer Strategy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-28 Li-Jing Huang, Gao-Ming Zhang, Yao Zhang, Bao-Jia Li, Nai-Fei Ren, Lei Zhao, Yi-Lun Wang
An effective method based on laser etching and driving layer strategy was proposed to prepare patterned Ag nanoparticles (Ag NPs) on fluorine-doped tin oxide (FTO)/glass substrate and thus to enhance the photoelectric properties. This method successively included depositing an aluminum-doped zinc oxide (AZO) driving layer, laser etching, depositing an Ag layer, furnace annealing and laser removal.
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Corrosion Resistance and Durability of Superhydrophobic Coating on AZ31 Mg Alloy via One-Step Electrodeposition Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-28 Zheng-Zheng Yin, Zhao-Qi Zhang, Xiu-Juan Tian, Zhen-Lin Wang, Rong-Chang Zeng
To enhance durability and adhesion of superhydrophobic surface, an integrated superhydrophobic calcium myristate (Ca[CH3(CH2)12COO]2) coating with excellent corrosion resistance was fabricated on AZ31 magnesium (Mg) alloy via one-step electrodeposition process. Field-emission scanning electron microscopy, Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy as well as X-ray
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Oxidation, Mechanical and Tribological Behaviors of the Ni/cBN Abrasive Coating-Coated Titanium Alloys Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-23 Y. D. Liu, J. H. Liu, W. S. Gu, H. L. Li, W. H. Li, Z. L. Pei, J. Gong, C. Sun
In order to improve the oxidation and wear resistance of blades tip of titanium alloys as well as the sealing performance of the gas turbine engine, a Ni/cBN abrasive coating was prepared on titanium alloys through composite electroplating. Oxidation, mechanical and tribological properties of the abrasive coating were investigated. Furthermore, the effect of the oxidation on the mechanical and tribological
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Dislocation-Induced Precipitation and Its Strengthening of Al–Cu–Li–Mg Alloys with High Mg Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-23 Xiangpeng Gong, Shifang Luo, Shiyong Li, Cuilan Wu
Generally, the good combination of pre-deformation and aging can improve the mechanical strength of the Al–Cu–Li–Mg alloys. However, the effects of pre-deformation on competitive precipitation relationship and precipitation strengthening have not been clarified in detail in Al–Cu–Li–Mg alloys with high Mg. In the present study, the effects of pre-deformation level on the microstructure and mechanical
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On the Microstructural Strengthening and Toughening of Heat-Affected Zone in a Low-Carbon High-Strength Cu-Bearing Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-23 Xiaohui Xi, Jinliang Wang, Liqing Chen, Zhaodong Wang
In this article, the influence of simulated thermal cycles for the heat-affected zone (HAZ) on the microstructural evolution and mechanical properties in a low-carbon high-strength Cu-bearing steel was investigated by microstructural characterization and mechanical tests. The results showed that the microstructure of the coarse-grained heat-affected zone (CGHAZ) and the fine-grained heat-affected zone
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Probing into the Yield Plateau Phenomenon in Commercially Pure Titanium During Tensile Tests Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-20 Xiaohui Shi, Zuhan Cao, Zhiyuan Fan, Ruipeng Guo, Junwei Qiao
To explain the intrinsic mechanism of the yield plateau phenomenon in commercially pure titanium, the tensile behaviors of commercially pure titanium specimens after 91.6% cryorolling and subsequent annealing at 280 °C, 335 °C, 450 °C and 600 °C have been studied. The results show that the yield plateau phenomenon is a result of dislocation behaviors controlled by grain size and thus only exists within
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Simultaneously Improving Mechanical Properties and Stress Corrosion Cracking Resistance of High-Strength Low-Alloy Steel via Finish Rolling within Non-recrystallization Temperature Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-13 Hongchi Ma, Baijie Zhao, Yi Fan, Kui Xiao, Jinbin Zhao, Xuequn Cheng, Xiaogang Li
The effect of hot rolling process on microstructure evolution, mechanical properties and stress corrosion cracking (SCC) resistance of high-strength low-alloy (HSLA) steels was investigated by varying the finish rolling temperature (FRT) and total rolling reduction. The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of 60% with the FRT of 950 °C
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Effect of Rare Earth and Cooling Process on Microstructure and Mechanical Properties of an Ultra-Cleaned X80 Pipeline Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-13 He Duan, Yi-Yin Shan, Ke Yang, Xian-Bo Shi, Wei Yan, Yi Ren
In order to explore the effect of a small amount of rare earth addition in ultra-cleaned pipeline steel and the influence of the cooling process on the tensile and impact properties, three API X80 pipeline steels were fabricated by varying RE addition and the cooling process at the same time. Three microstructures with different features for a low C high Nb microalloyed high-strength pipeline steel
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Orientation Dependence of the Micro-Pillar Compression Strength in an Electron Beam Melted Ti–6Al–4V Alloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-11 Jinsen Tian, Jiang Ma, Ming Yan, Zhuo Chen, Jun Shen, Jing Wu
An α/β two-phase Ti–6Al–4V alloy was fabricated by electron beam melting to obtain a basketweave structure. The orientation dependence of the mechanical properties of Ti–6Al–4V alloy was studied by micro-pillar compression and post-mortem transmission electron microscopy analysis. The results indicate that different grains have different mechanical responses, and the possible attributions were discussed
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Cytotoxicity of Ti–6Al–4V–5Cu Alloy to MC3T3-E1 Cells Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-11 Ji Zhang, Ling Ren, Ke Yang
The aim of this work was to study the cytotoxicity of Ti–6Al–4V–5Cu (TC4–Cu) alloy for dental applications and evaluate the cell viability of different fabricated TC4–Cu alloys in contact with MC3T3-E1 cells in vitro. Ti–6Al–4V (TC4) alloy was used as a negative control to evaluate the cytotoxicity level of TC4–Cu alloy so as to provide basic support for the dental clinical application. Control group
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Effect of Zener–Hollomon Parameter on High-Temperature Deformation Behaviors of Mg–6Zn–1.5Y–0.5Ce–0.4Zr Alloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-11 Bo Wu, Jianbo Li, Lizi Liu, Xianhua Chen, Jun Tan, Jiangfeng Song, Muhammad Rashad, Fusheng Pan
High-temperature compressive deformation behaviors of Mg–6Zn–1.5Y–0.5Ce–0.4Zr alloy were investigated at temperatures and strain rates ranging from 523 to 673 K and from 0.001 to 1 s−1, respectively. The studied alloy was mainly composed of α-Mg, Mg3Zn6Y (I phase), Mg–Zn–Ce and Mg3Zn3Y2 (W phase). The constitutive equation of Mg alloy was obtained, and the apparent activation energy (Q) was determined
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Microstructural Evolution and Biodegradation Response of Mg–2Zn–0.5Nd Alloy During Tensile and Compressive Deformation Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-10 Iniobong P. Etim, Wen Zhang, Yi Zhang, Lili Tan, Ke Yang
The effect of deformation behavior on the in vitro corrosion rate of Mg–2Zn–0.5Nd alloy was investigated experimentally after uniaxial tensile and compressive stress. The microstructure and texture were characterized using electron backscattered diffraction and X-ray diffraction, while potentiodynamic polarization and immersion tests were used to investigate the corrosion response after deformation
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Prediction of Primary Dendrite Arm Spacing in Pulsed Laser Surface Melted Single Crystal Superalloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-03 Shiwei Ci, Jingjing Liang, Jinguo Li, Haiwei Wang, Yizhou Zhou, Xiaofeng Sun, Hongwei Zhang, Yutian Ding, Xin Zhou
Primary dendritic arm spacing (PDAS) is an important microstructure feature of the nickel-base single crystal superalloys. In this paper, a numerical model predicting the PDAS evolution with additive manufacturing parameters using pulsed laser is established, which combines the theoretical PDAS models with the temperature field calculation model during pulsed laser process. Based on this model, processing
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A Review of Al Alloy Anodes for Al–Air Batteries in Neutral and Alkaline Aqueous Electrolytes Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-02 Pengfei Wu, Shengan Wu, Dan Sun, Yougen Tang, Haiyan Wang
Aluminum–air (Al–air) batteries are promising candidates for energy storage applications because of their high theoretical energy density and low cost. Nevertheless, their developments have been severely hindered by multiple obstacles, among which the activation and self-corrosion inhibition of Al anode have been considered to be significant challenges. In neutral electrolytes, the main problem is
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In-situ Synthesis of Coral-Like Molybdenum Phosphide (MoP) Microspheres for Lithium-Ion Battery Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-11-02 Xinlong Liu, Wei Yang, Zhiting Liu, Haosen Fan, Wenzhi Zheng
Molybdenum phosphide (MoP) has attracted extensive attention as promising anode candidates for lithium-ion batteries owing to its high specific capacity, low potential range and low polarization. However, severe volume changes and intrinsic low conductivity are major challenges for further application of MoP electrode materials. In this work, a coral-like MoP microsphere encapsulated by N-doped carbon
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PVdF-HFP-Based Gel Polymer Electrolyte with Semi-Interpenetrating Networks For Dendrite-Free Lithium Metal Battery Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-16 Lu Liu, Xiaodong Wang, Chenhui Yang, Peng Han, Lei Zhang, Li Gao, Zirui Wu, Bingxin Liu, Ruiping Liu
The safety issues and lower energy density of the lithium metal batteries are the two main challenges that hinder their applications in the fields of electric vehicles and portable devices. In this work, the semi-interpenetrated polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP)-based gel polymer electrolyte was synthesized through UV-curing method by employing the ethoxylated trimethylolpropane
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Microstructure and Mechanical Behavior of FeNiCoCr and FeNiCoCrMn High-Entropy Alloys Fabricated by Powder Metallurgy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-15 Chenliang Chu, Weiping Chen, Zhen Chen, Zhenfei Jiang, Hao Wang, Zhiqiang Fu
The present work reports a systematic investigation on phase evolution, microstructure and microstructure–property relationship of two typical face-centered cubic (FCC) structured high-entropy alloys (HEAs), FeNiCoCr and FeNiCoCrMn, prepared via mechanical alloying (MA) followed by spark plasma sintering (SPS). Following 50 h of MA, the two HEAs consisted of a mixture of FCC and body-centered cubic
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Phase Characterization and Formation Behavior in 6 wt% Si High-silicon Austenitic Stainless Steel during Isothermal Aging Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-14 Sihan Chen, Tian Liang, Yangtao Zhou, Weiwei Xing, Chengwu Zheng, Yingche Ma, JinMing Wu, Guobin Li, Kui Liu
The precipitation behavior of different phases in a high-silicon stainless steel (6 wt% Si) during aging at 600–1050 °C for 24 h was investigated. The morphology, crystal structure and composition of various precipitates were detailly characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. Four phases were mainly identified: χ-phase, M6C carbides,
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Performance of Nb 0.8 Zr 0.2 Layer-Modified AISI430 Stainless Steel as Bipolar Plates for Direct Formic Acid Fuel Cells Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-13 Yuanyuan Liu, Zhongmin Lang, Jinlong Cui, Shengli An
To improve the interfacial conductivity and corrosion resistance of AISI430 stainless steel (430SS) as bipolar plates for direct formic acid fuel cells (DFAFCs), a Nb0.8Zr0.2 layer has been successfully synthesized via the pulsed laser deposition (PLD) technique on the surface of 430SS. This Nb0.8Zr0.2 layer is smooth, uniform, and comparatively compact without any surface flaw and micropore. Investigation
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Effect of Orientation on Stress-Rupture Property and Related Deformation Microstructure of a Ni-Base Re-containing Single-Crystal Superalloy at 900 °C Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-13 Guang-Lei Wang, Jin-Lai Liu, Ji-De Liu, Yi-Zhou Zhou, Xu-Dong Sun, Hai-Feng Zhang, Xiao-Feng Sun
Stress-rupture properties of a Ni-base Re-containing single-crystal superalloy with three orientations have been tested under 900 °C/445 MPa. An obvious anisotropy of stress-rupture property is attributed to orientation reliant deformation microstructure. The good strength in [001] orientation is attributed to the rapid multiplication of dislocations active in horizontal channels and later γ’ cutting
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Effect of Process Parameters on Defects, Melt Pool Shape, Microstructure, and Tensile Behavior of 316L Stainless Steel Produced by Selective Laser Melting Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-13 Hua-Zhen Jiang, Zheng-Yang Li, Tao Feng, Peng-Yue Wu, Qi-Sheng Chen, Yun-Long Feng, Long-Fei Chen, Jing-Yu Hou, He-Jian Xu
Previous studies have revealed that laser power and energy density are significant factors affecting the quality of parts manufactured by selective laser melting (SLM). The normalized equivalent density E0* and dimensionless laser power q*, which can be regarded as a progress on the understanding of the corresponding dimensional quantities, are adopted in this study to examine the defects, melt pool
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Correlation Between Phase Stability and Tensile Properties of the Ni-Based Superalloy MAR-M247 Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-12 Linxu Li, Xiufang Gong, Changshuai Wang, Yunsheng Wu, Hongyao Yu, Haijun Su, Lanzhang Zhou
Phase stability and its effect on tensile properties of MAR-M247 alloy have been investigated during thermal exposure at 800–900 °C for up to 10,000 h. Detailed investigations reveal that the larger secondary γ′ phase has no obvious growth, but the smaller tertiary γ′ phase obviously coarsens and the coalescence occurs during thermal exposure at 850 °C and below. γ′ coarsening behavior is consistent
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Optimized Tension for AZ31B Thin Sheets Rolled with On-Line Heating Rolling Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-12 Biquan Xiao, Jiangfeng Song, Hua Zhao, Aitao Tang, Qiang Liu, Bin Jiang, Shitao Dou, Fusheng Pan
On-line heating rolling mill which could efficiently preheat sheet and apply tensile force on both ends of the sheet along rolling direction (RD) was used to investigate the effect of tension on mechanical behavior and shape quality of magnesium sheets. For revealing the influence mechanism, many analysis techniques including optical microscope, electron backscattered diffraction, macrotexture and
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Enhancing Mechanical Properties of Mg–6Zn Alloy by Deformation-Induced Nanoprecipitation Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-12 Kai Yan, Huan Liu, Xiaowei Xue, Jing Bai, Honghui Chen, Shuangquan Fang, Jingjing Liu
We presented the solution of deformation-induced precipitation after homogenization to enhance the mechanical properties of Mg–6Zn alloys. The results show that the improved strategy exhibits more effective strengthening role than grain refinement methods based on low-temperature severe plastic deformation under the same strain. The low-temperature deformation with larger extrusion ratio results in
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Conductivity and Oxidation Behavior of Fe-16Cr Alloy as Solid Oxide Fuel Cell Interconnect Under Long-Stability and Thermal Cycles Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-12 Jianwu Zhou, Qiangfeng Chen, Junkang Sang, Rongmin Wu, Zhuobin Li, Wanbing Guan
Conductivity and oxidation behavior of Fe-16Cr alloy were investigated under long-term stability operation at 750 °C and thermal cycles from room temperature to 750 °C. The results showed that the area specific resistance (ASR) of Fe-16Cr alloy increased over time and reached about 56.29 mΩ cm2 after 40,000 h of long-term stability operation at 750 °C by theoretical calculation. The ASR of Fe-16Cr
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Dispersion and Damage of Carbon Nanotubes in Carbon Nanotube/7055Al Composites During High-Energy Ball Milling Process Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-10-09 S. Bi, B. L. Xiao, Z. H. Ji, B. S. Liu, Z. Y. Liu, Z. Y. Ma
High-energy ball milling (HEBM) combined with powder metallurgy route was used to fabricate carbon nanotube (CNT) reinforced 7055Al composites. Two powder morphology evolution processes (HEBM-1 and HEBM-2) were designed to investigate the dispersion and damage of CNTs during HEBM process. HEBM-1 evolution process involved powder flattening, cold-welding and fracture, while HEBM-2 evolution process
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Microstructure and Mechanical Properties of Low-Carbon Q235 Steel Welded Using Friction Stir Welding Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Hongduo Wang, Kuaishe Wang, Wen Wang, Yongxin Lu, Pai Peng, Peng Han, Ke Qiao, Zhihao Liu, Lei Wang
This study focuses on the microstructure and mechanical properties of the joints of Q235 mild steel, which was formed by the friction stir welding (FSW). The results indicated that, after the FSW, the heat-affected zone (HAZ) of the retreating side (HAZRS) and the HAZ of the advancing side (HAZAS) recovered under the influence of the heating cycle. The transformation of the phases in the thermo-mechanically
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Quasi-Situ Characterization of Deformation in Low-Carbon Steel with Equiaxed and Lamellar Microstructure Treated by the Quenching and Partitioning Process Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-15 Pengfei Gao, Weijian Chen, Feng Li, Beijia Ning, Zhengzhi Zhao
The relationship between microstructure morphology and mechanical properties of the low-carbon steel (Fe-0.20C-2.59Mn-2.13Si) treated by different intercritical annealed quenching and partitioning (Q&P) processes was investigated through interrupted tensile tests plus quasi-situ electron backscatter diffraction measurements. Results show that size and distribution of retained austenite (RA) directly
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A Comparative Study on the Microstructure and Properties of ITO Targets and Thin Films Prepared from Two Different Powders Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-11 Fangsheng Mei, Tiechui Yuan, Ruidi Li, Jingwei Huang
With the rapid development of indium tin oxide (ITO) in the electronic display industry, choosing which raw powders to prepare high-quality ITO targets has always been a controversial topic. In the work, in order to clearly understand the effect of the raw powders on the microstructure and properties of ITO targets and thin films, tin-doped indium oxide (dITO) and In2O3-SnO2 mixed (mITO) powders were
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Obtaining Ultra-High Strength and Ductility in a Mg–Gd–Er–Zn–Zr Alloy via Extrusion, Pre-deformation and Two-Stage Aging Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-05 Lin-Yue Jia, Wen-Bo Du, Jin-Long Fu, Zhao-Hui Wang, Ke Liu, Shu-Bo Li, Xian Du
The Mg–12Gd–1Er–1Zn–0.9Zr (wt%) alloy with ultra-high strength and ductility was developed via hot extrusion combined with pre-deformation and two-stage aging treatment. The age-hardening behavior and microstructure evolution were investigated. Pre-deformation introduced a large number of dislocations, resulting in strain hardening and higher precipitation strengthening in the subsequent two-stage
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Corrosion Behavior of 316L Stainless Steels Exposed to Salt Lake Atmosphere of Western China for 8 years Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-04 Mingxiao Guo, Junrong Tang, Tianzhen Gu, Can Peng, Qiaoxia Li, Chen Pan, Zhenyao Wang
The evolution of corrosion behavior of 316L stainless steels exposed to salt lake atmosphere for 8 years was investigated. The results showed that the stainless steel in salt lake atmosphere had a greater corrosion rate during the initial exposure time and relatively lower corrosion rate during the subsequent exposure time. Dust depositions accumulated on the downward surface caused severe local corrosion
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Mechanical Property Evaluation of a SLMed Martensitic Stainless Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-04 Yun Shi, Xiaojing Xiong, Zhengwu Liu, Yi Yang, Juan Hou, Songquan Wu, Jeremy H. Rao, Kai Zhang, Aijun Huang
A martensitic stainless steel AISI420 fabricated by selective laser melting (SLM) and post-processed by austenitizing and tempering heat treatment was investigated in this study. The as-fabricated SLMed AISI420 showed a strong mechanical property anisotropy and low ductility in the longitudinal direction. Detailed microstructural characterization revealed the presence of austenite and a relatively
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Anisotropic Electroplastic Effects on the Mechanical Properties of a Nano-Lamellar Austenitic Stainless Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-04 Y. R. Ma, H. J. Yang, D. D. Ben, X. H. Shao, Y. Z. Tian, Q. Wang, Z. F. Zhang
Effects of electropulsing treatment (EPT) on the microstructural evolution and mechanical properties of a cold-rolled 316L austenitic stainless steel with nano-lamellar structure were investigated. The EPT experiments were carried out with the electric current direction along the rolling direction (RD) and the transverse direction (TD) of the samples, respectively. Significant anisotropic electroplastic
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Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-09-01 Ji-Jin Xu, Shuai Wang, Ze Chai, Chun Yu, Jun-Mei Chen, Hao Lu
The stress corrosion cracking (SCC) behaviour of AISI 304 pipe girth welds which were welded by a single-pass laser beam welding (LBW) and a multi-pass tungsten inert gas welding (TIG), respectively, was studied by the slow strain rate tests combined with the electrochemical corrosion tests. The results show that fracture of both the TIG joint and LBW joint occurs in the heat-affected zone (HAZ). According
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Nucleation Analysis of Variant Transformed from Austenite with Σ 3 Boundary in High-Strength Low-Alloy Steel Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-31 Bin-Bin Wu, Zhi-Quan Wang, Cheng-Jia Shang, Yi-Shuang Yu, Devesh Misra
We elucidate here the effects of annealing twins on phase transformation products based on electron back-scatter diffraction analysis and corresponding microstructure visualization and quantification methods. Martensite and bainite were obtained by rapid continuous cooling and isothermal processing at different temperatures, respectively, which were designed to study variants formed in austenite with
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Corrosion Behavior and Mechanism of Irradiated 304 Nuclear Grade Stainless Steel in High-Temperature Water Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-18 Ping Deng, En-Hou Han, Qunjia Peng, Chen Sun
Corrosion behavior and mechanism of irradiated 304 nuclear grade stainless steel were studied in simulated pressurized water reactor primary water. The microstructure of the oxide formed on the steel irradiated to different doses over an exposure period range of 25–1500 h was analyzed and compared. It was found that the general and intergranular corrosion rates of the steel were increased with irradiation
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Microstructure Evolution of Primary γ ′ Phase in Ni 3 Al-Based Superalloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-16 Xin He, Jianbo Zhang, Yuanyi Peng, Jingan Li, Jian Ding, Chang Liu, Xingchuan Xia, Xueguang Chen, Yongchang Liu
In this work, water cooling, air cooling (AC) and furnace cooling (FC) were applied to investigate the effect of cooling rate on microstructure evolution of primary γ′ in a newly designed Ni3Al-based alloy. The results showed that nucleation rate of primary γ′ increased with increasing cooling rate. In addition, higher cooling rate shortened growth period of primary γ′, which made its morphology close
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Copper-Coated Graphene Nanoplatelets-Reinforced Al–Si Alloy Matrix Composites Fabricated by Stir Casting Method Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-15 Xiaoqi Han, Lizhuang Yang, Naiqin Zhao, Chunnian He
In this study, Cu nanoparticles-coated graphene nanoplatelets (Cu-NPs@GNPs) were synthesized by a simple in situ method with the assistance of NaCl templates and used for reinforcing Al–10Si composites through stir casting process. The experimental results showed that the coating of Cu-NPs on the GNPs could compromise the density mismatch between GNPs and metal matrix and effectively hinder the float
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Facile Synthesis of Yolk–Shell Bi@C Nanospheres with Superior Li-ion Storage Performances Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Xijun Xu, Dechao Zhang, Zhuosen Wang, Shiyong Zuo, Jiadong Shen, Zhengbo Liu, Jun Liu
Recently, exploring appropriate anode materials for current commercial lithium-ion batteries (LIBs) with suitable operating potential and long cycle life has attracted extensive attention. Herein, a novel anode of Bi nanoparticles fully encapsulated in carbon nanosphere framework with uniform yolk–shell nanostructure was prepared via a facile hydrothermal method. Due to the special structure design
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Effect of CaCl 2 and NaHCO 3 in Physiological Saline Solution on the Corrosion Behavior of an As-Extruded Mg–Zn–Y–Nd alloy Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Baojie Wang, Daokui Xu, Tianyu Zhao, Liyuan Sheng
In this study, the corrosion behaviors of an as-extruded Mg–4%Zn–2%Y–1.8%Nd (in wt.%) alloy in different physiological saline solutions were investigated and compared. The results indicated that the alloy in the 9 g/L NaCl had the higher corrosion resistance than that containing with CaCl2 and NaHCO3. Moreover, it demonstrated that the corrosion behaviors of the alloy in two types of solutions were
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Influence of Twinning Texture on the Corrosion Fatigue Behavior of Extruded Magnesium Alloys Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Jiaqi Hu, Qite Li, Hong Gao
Bio-magnesium alloys have received great attention due to their degradability and biocompatibility. Corrosion fatigue failure is a huge challenge in vivo for bio-magnesium alloy implants. Understanding the effects of twinning textures on the corrosion fatigue of magnesium alloys is meaningful for the applications. In the current study, pre-compression strains of 2% and 4% were carried out on extruded
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Typical Microstructural Characteristics of Ti–5Al–5Mo–5V–3Cr–1Fe Metastable β Ti Alloy Forged in α + β Region Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Zhiying Zheng, Linjiang Chai, Kang Xiang, Weijiu Huang, Yongfeng Wang, Liangliang Liu, Lin Tian
In this study, typical microstructural characteristics of a metastable β Ti alloy (Ti–5Al–5Mo–5V–3Cr–1Fe) forged in a dual-phase region (strain of 54% at 820 °C) were investigated in detail by the combined use of X-ray diffraction, energy dispersive spectroscopy, electron channeling contrast imaging and electron backscatter diffraction techniques. Results show that the microstructure of the forged
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Evolution of Quasicrystals and Long-Period Stacking Ordered Structures During Severe Plastic Deformation and Mixing of Dissimilar Mg Alloys Upon Friction Stir Welding Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Meichen Liang, Hao Zhang, Lifeng Zhang, Peng Xue, Dingrui Ni, Weizhen Wang, Zongyi Ma, Hengqiang Ye, Zhiqing Yang
Microstructural evolution during severe plastic deformation and mixing of Mg95.8Zn3.6Gd0.6 and Mg97Cu1Y2 (at%) alloys upon friction stir welding was studied. A laminated onion-ring structure composed of alternative distribution of layers with significantly refined microstructures from different alloys was formed in the stirred zone. Coarse quasicrystals were broken up and dispersed with most of them
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Prediction on Phase Stabilities of the Zr–H System from the First-Principles Acta Metall. Sin. (Engl. Lett.) (IF 2.09) Pub Date : 2020-08-14 Miao Chen, Wu Qin, Yixuan Hu, Yiren Wang, Yong Jiang, Xiaosong Zhou, Shuming Peng, Yibei Fu
Basic fundamentals governing the hydrogenation of Zr and its alloys have both theoretical and practical importance. In this work, first-principles calculations have been performed to evaluate the relative stabilities of various possible phases in ZrHx (x = 1–2) under different temperatures and pressures. It was predicted that fct-γ and ε phases with various different H-atom configurations can be energetically