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学者姓名：王晨
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Abstract ：
The tension-compression yield asymmetry caused by the strengthening of Mg-Zn-Gd-Zr alloy due to extrusion deformation is an important issue that must be addressed in its application. In this study, the effects of loading direction on the tensile and compressive mechanical behaviors of Mg-5Zn-2Gd-0.2Zr alloy were systematically investigated. As the loading angle (the angle between the loading direction and the extrusion direction) increases from 0 degrees to 30 degrees, 45 degrees, 60 degrees and 90 degrees, the tensile yield strength decreases more significantly than the compressive yield strength. Consequently, the tension-compression yield asymmetry is gradually improved. Additionally, the ultimate compressive strength decreases more markedly than the ultimate tensile strength with the increment of the loading angle. In tensile tests conducted at 0 degrees, 30 degrees and 45 degrees, two distinct stages of decreasing strain hardening rates are typically observed. For the 60 degrees and 90 degrees tensile tests, one unusual ascending stage of strain hardening rate is observed. For all compressive tests, three stages of strain hardening are consistently noted; however, the increment in strain hardening rate caused by {10-12} extension twinning decreases with the increasing loading angle. A model combining loading angle and Schmid factor distribution was established. The calculated results indicate that the dominant deformation modes during the yielding process also vary significantly with the loading conditions. This clarification highlights the differences in yield strength variations between tension and compression. Finally, an analysis of the plane trace and crack propagation direction near the fracture surface reveals the fracture mechanisms associated with tensile and compressive tests at different loading directions. This study promotes understanding of the mechanical behaviors of Mg-5Zn-2Gd-0.2Zr alloy under different loading directions, and helps to thoroughly elucidate the anisotropic effects of texture on the mechanical properties of magnesium alloys.
Keyword ：
fracture mechanism fracture mechanism heterogeneous grains heterogeneous grains magnesium alloy magnesium alloy strain hardening strain hardening tensile and compressive strength tensile and compressive strength
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| GB/T 7714 | Chen, Jieming , Xiao, Lei , Wang, Xuefang et al. Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains [J]. | CRYSTALS , 2024 , 14 (10) . |
| MLA | Chen, Jieming et al. "Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains" . | CRYSTALS 14 . 10 (2024) . |
| APA | Chen, Jieming , Xiao, Lei , Wang, Xuefang , Li, Zhuo , Wang, Chen , Wang, Bingshu et al. Effect of Loading Direction on Tensile-Compressive Mechanical Behaviors of Mg-5Zn-2Gd-0.2Zr Alloy with Heterogeneous Grains . | CRYSTALS , 2024 , 14 (10) . |
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To achieve high thermal efficiency, today's nuclear reactor structures are exposed to higher temperatures and pressures, which requires the use of high-strength steels with specific properties, such as ODS steels. There is a need to clarify the evolution of the microstructure and properties of steels at elevated temperatures. This study systematically investigates the evolution of microstructure, texture, and mechanical property variations of 12CrODS steels after hot-rolling and subsequent annealing at 1000 degrees C and 1200 degrees C. The investigation utilizes optical microscopy, electron backscatter diffraction technique, and mechanical property measurements. The microstructure of hot-rolled samples shows a layered alternating distribution, which is distinguished by a notable presence of the alpha-fiber texture. Following annealing at 1000 degrees C, the martensite grains are smaller with a reduced hardness, while maintaining a strong alpha-fiber texture. After annealing at 1200 degrees C, there is a rapid increase in the growth of martensite grains, a significant rise in hardness, a reduction in the alpha-fiber texture characteristics, and an improvement in the gamma-fiber texture characteristics. Moreover, the maximum intensity of the alpha-fiber texture diminishes as the annealing temperature increases. The mechanical properties of the samples deteriorated after annealing at 1200 degrees C, which can be attributed to the coarse martensite grains and the texture components containing the {001} cleavage plane dominating the occurrence of brittle cleavage fracture. The 0.1Y sample after annealing at 1000 degrees C exhibits an excellent combination of strength (1458 MPa) and ductility (20.3%), which is owing to the unique heterogeneous grain structure and the evolution of favorable texture.
Keyword ：
Annealing Annealing Mechanical properties Mechanical properties Microstructure characteristics Microstructure characteristics ODS steel ODS steel Texture Texture
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| GB/T 7714 | Li, Jiajie , Chen, Jingxian , You, Zhangjing et al. Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 : 4800-4812 . |
| MLA | Li, Jiajie et al. "Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 30 (2024) : 4800-4812 . |
| APA | Li, Jiajie , Chen, Jingxian , You, Zhangjing , Deng, Liping , Wang, Chen , Chen, Junfeng et al. Effect of annealing temperature on the evolution of microstructure, texture, and mechanical properties of hot-rolled 12Cr-ODS steel . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 30 , 4800-4812 . |
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In this paper, the effects of Hf addition on the mechanical properties, electrical conductivity and microstructure of Cu-Sn-P alloy were investigated. The results show that the Hf addition can enhance the mechanical properties and electrical conductivity of Cu-Sn-P alloy. The alloy with 0.05 wt% Hf exhibits the best comprehensive performance with yield strength of 625 MPa, tensile strength of 661 MPa and electrical conductivity of 16.8 %IACS. Compared with the Cu-Sn-P alloy without Hf addition, the yield strength and tensile strength are increased by 8.4% and 7.8%, and the electrical conductivity is increased by 24.4%. The increase in the strength of Hf-added alloy can be attributed to the synergistic effect of multiple strengthening mechanisms, including fine grain strengthening, twin strengthening, dislocation strengthening, precipitation strengthening and Σ3n (n = 1, 2, 3) grain boundary strengthening. Moreover, the Hf-P precipitates can be observed in the Hf-added alloy. According to the amount of Hf addition, these precipitates can manifest as the fine HfP2 phase and the coarse HfP phase. The formation of Hf-P precipitates contributes to the precipitation strengthening and the purification of Cu matrix, thus contributing to the improvement of strength and conductivity. © 2024 The Authors
Keyword ：
Copper alloys Copper alloys Electric conductivity Electric conductivity Hafnium alloys Hafnium alloys Lead alloys Lead alloys Tensile strength Tensile strength Tin alloys Tin alloys Yield stress Yield stress
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| GB/T 7714 | Wei, Biao , Yang, Haoren , Wang, Chen et al. Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy [J]. | Journal of Materials Research and Technology , 2024 , 33 : 2981-2988 . |
| MLA | Wei, Biao et al. "Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy" . | Journal of Materials Research and Technology 33 (2024) : 2981-2988 . |
| APA | Wei, Biao , Yang, Haoren , Wang, Chen , Zhou, Jianhui , Xiao, Lei , Ma, Tianyu et al. Effects of Hf addition on the microstructure and properties of Cu-Sn-P alloy . | Journal of Materials Research and Technology , 2024 , 33 , 2981-2988 . |
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Despite the high theoretical energy product and low material cost of Fe -rich 2:17 -type Sm-Co-Fe-CuZr magnets, it is still a big challenge to simultaneously achieve high energy product and high coercivity due to damaged cellular nanostructure, i.e. insufficient cell boundary precipitates. In this work, both high energy product ( -30.29 MGOe) and high coercivity ( -26.24 kOe) have been achieved in Fe -rich Sm 24.8 Co bal Fe 20.5 Cu 5.2 Zr x ( x wt%) magnets through optimizing Zr content. It reveals that raising Zr content from 1.5 wt% to 2.5 wt% can effectively refine the cellular nanostructure, which corresponds to an increased volume fraction of cell boundary precipitates. However, excess Zr content (e.g. above 2.5 wt%) leads to the formation of micron -sized Zr-rich Zr 6 Co 23 soft magnetic particles, weakening the hard magnetic performance. In particular, the high Zr-content (3.5 wt%) magnet exhibits strongly inhomogeneous chemistry as well as cellular nanostructure in the vicinity of micron -sized Zr 6 Co 23 particles (i.e. heterogeneous distribution of cell boundary precipitates), deteriorating both squareness factor and coercivity. As a result, the optimum magnetic property combination is achieved at an intermediate Zr concentration by balancing the contradictive effects between cell refinement and soft magnetic impurities. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
Keyword ：
Magnetic properties Magnetic properties Microstructure Microstructure Permanent magnets Permanent magnets
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| GB/T 7714 | Li, Jian , Fang, Minxia , Liu, Yao et al. Enhanced magnetic performance of Fe-rich Sm 2 Co 17-type magnets by optimizing Zr content [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 193 : 178-186 . |
| MLA | Li, Jian et al. "Enhanced magnetic performance of Fe-rich Sm 2 Co 17-type magnets by optimizing Zr content" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 193 (2024) : 178-186 . |
| APA | Li, Jian , Fang, Minxia , Liu, Yao , Song, Xin , Jia, Wentao , Gou, Junming et al. Enhanced magnetic performance of Fe-rich Sm 2 Co 17-type magnets by optimizing Zr content . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2024 , 193 , 178-186 . |
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Evident tension-compression yield asymmetry limited the potential use of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy as a structural material. Pre-torsion deformation (free-end torsion) was conducted on the extruded alloy and its effects on microstructure and tensile-compressive mechanical properties were investigated in this study. It was found that the as-extruded alloy exhibited homogenous microstructure and <100> - <110 > double-peak fiber texture. Gradient structures along the radial direction were formed after pre-torsion, which contained gradient distribution of dislocations, grain size, {102} extension twin lamellas and texture components. <100> - <110 > double-peak fiber texture was gradually weakened with the torsional angle increasing from 90 degrees to 135 degrees and 180 degrees, and it was related with the re-orientation of extension twinning and dislocation movement. Moreover, extension twinning was more easily to be activated in grains with <110> fiber texture component, and this phenomenon was revealed by calculating the global Schmid factor of extension twinning under pure shear stress state. Tensile and compressive yield strength increased monotonically with the increasing torsional angle. Meanwhile, ductility almost remained unchanged. Tension-compression yield asymmetry was gradually reduced, and it was eliminated after 180. pre-torsion, which was attributed to the texture weakening. The studying provided a promising and cost-effective method to enhance yield strength and reduce tension-compression yield asymmetry while also keep ductility for extruded Mg alloys.
Keyword ：
Extruded Mg alloys Extruded Mg alloys Gradient structures Gradient structures Pre -torsion deformation Pre -torsion deformation Tension -compression yield asymmetry Tension -compression yield asymmetry
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| GB/T 7714 | Xiao, Lei , Yang, Guangyu , Wang, Chen et al. Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2023 , 883 . |
| MLA | Xiao, Lei et al. "Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 883 (2023) . |
| APA | Xiao, Lei , Yang, Guangyu , Wang, Chen , Chen, Junfeng , Jie, Wanqi . Formation of gradient microstructure and elimination of tension-compression yield asymmetry of the extruded Mg-4.58Zn-2.6Gd-0.18Zr alloy via free-end torsion . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2023 , 883 . |
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材料力学实验是材料学科的核心专业基础实验，其实验教学尤其重要。然而传统的线下集中式实验教学模式已经不适合新工科建设背景下对工程实践创新人才的培养需求。在深入分析传统线下集中式实验教学模式存在问题的基础上，采用线上幕课、虚拟仿真实验系统和线下实验教学相结合的线上线下混合式教学模式对材料力学实验进行实验教学改革和探索，取得了良好的教学成效。该实验教学改革的实践和探索，对提高学生学习积极性、解决实验学时不足、提升实验教学质量和培养学生的工程实践创新能力等方面具有一定的借鉴意义。
Keyword ：
实验教学改革 实验教学改革 材料力学实验 材料力学实验 混合式教学 混合式教学 线上线下 线上线下
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| GB/T 7714 | 林鹏 , 王晨 , 李凌云 . 基于线上线下混合式教学模式的材料力学实验教学改革研究 [J]. | 长春工程学院学报(社会科学版) , 2023 , 24 (03) : 141-145 . |
| MLA | 林鹏 et al. "基于线上线下混合式教学模式的材料力学实验教学改革研究" . | 长春工程学院学报(社会科学版) 24 . 03 (2023) : 141-145 . |
| APA | 林鹏 , 王晨 , 李凌云 . 基于线上线下混合式教学模式的材料力学实验教学改革研究 . | 长春工程学院学报(社会科学版) , 2023 , 24 (03) , 141-145 . |
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通过固溶-冷轧-时效工艺制备Cu-1.0Cr-0.1Zr合金带材,研究时效工艺对合金导电率、力学性能和微观结构的影响,并进行析出动力学分析.结果表明,Cu-1.0Cr-0.1Zr合金在430℃时效180 min后获得最佳综合性能,导电率为85.86%IACS,硬度为HV 176.54,抗拉强度为552 MPa.对于在430℃时效的样品,当时效时间从30 min增加到180 min时,细小的fcc-Cr和Cu8Zr3析出相的尺寸从～5 nm长大到～8 nm,且析出相与铜基体的关系由共格转变为半共格.同时,还观察到bcc-Cr相的棒状和球状粗大颗粒(≥300 nm).此外,建立合金在不同时效温度下的析出动力学方程,绘制等温转变TTT曲线,通过计算获得合金的析出激活能为65 kJ/mol.
Keyword ：
Cu-Cr-Zr合金 Cu-Cr-Zr合金 力学性能 力学性能 导电率 导电率 析出动力学 析出动力学 析出相 析出相
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| GB/T 7714 | 杨海特 , 王文委教 , 王晨 et al. 时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响 [J]. | 中国有色金属学报（英文版） , 2023 , 33 (8) : 2439-2448 . |
| MLA | 杨海特 et al. "时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响" . | 中国有色金属学报（英文版） 33 . 8 (2023) : 2439-2448 . |
| APA | 杨海特 , 王文委教 , 王晨 , 王健 , 周建辉 , 童长青 et al. 时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响 . | 中国有色金属学报（英文版） , 2023 , 33 (8) , 2439-2448 . |
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通过固溶-冷轧-时效工艺制备Cu-1.0Cr-0.1Zr合金带材，研究时效工艺对合金导电率、力学性能和微观结构的影响，并进行析出动力学分析。结果表明，Cu-1.0Cr-0.1Zr合金在430℃时效180 min后获得最佳综合性能，导电率为85.86%IACS，硬度为HV 176.54，抗拉强度为552 MPa。对于在430℃时效的样品，当时效时间从30 min增加到180 min时，细小的fcc-Cr和Cu8Zr3析出相的尺寸从～5 nm长大到～8 nm，且析出相与铜基体的关系由共格转变为半共格。同时，还观察到bcc-Cr相的棒状和球状粗大颗粒(≥300 nm)。此外，建立合金在不同时效温度下的析出动力学方程，绘制等温转变TTT曲线，通过计算获得合金的析出激活能为65 k J/mol。
Keyword ：
Cu-Cr-Zr合金 Cu-Cr-Zr合金 力学性能 力学性能 导电率 导电率 析出动力学 析出动力学 析出相 析出相
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| GB/T 7714 | 杨海特 , 王文委教 , 王晨 et al. 时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响（英文） [J]. | Transactions of Nonferrous Metals Society of China , 2023 , 33 (08) : 2439-2448 . |
| MLA | 杨海特 et al. "时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响（英文）" . | Transactions of Nonferrous Metals Society of China 33 . 08 (2023) : 2439-2448 . |
| APA | 杨海特 , 王文委教 , 王晨 , 王健 , 周建辉 , 童长青 et al. 时效工艺对Cu-Cr-Zr合金带材性能和析出动力学的影响（英文） . | Transactions of Nonferrous Metals Society of China , 2023 , 33 (08) , 2439-2448 . |
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The Cu-1.1 wt% Hf-0.1 wt% Si alloy containing various precipitates is studied as a novel precipitation-strengthened alloy with high strength and high electrical conductivity. The Cu-Hf-Si alloy prepared by solution, cold rolling, and aging processes exhibits a hardness of 238.92 HV, a tensile strength of 691.01 MPa, a breaking elongation of 15.09%, and an electrical conductivity of 62.34% International Annealed Copper Standard. The optimal peak aging parameter for Cu-Hf-Si alloy is 430 & DEG;C for 90 min. The precipitation of Hf and Si atoms from the Cu matrix is helpful to enhance the electrical conductivity. The precipitation of Hf can produce fibrous Guinier Preston zone and & gamma;' precipitate, as well as spherical Cu10Hf7 phases. In addition, the coprecipitation of Si and Hf can also produce Hf3(Cu2Si)2 and HfCuSi phases. The high strength of Cu-Hf-Si alloy is mainly due to the multiprecipitates synergistic strengthening. A novel precipitation-strengthened Cu-1.1 wt% Hf-0.1 wt% Si alloy with high strength and high electrical conductivity is prepared by solution, cold-rolling, and aging processes. The precipitation of Hf and Si atoms from the matrix is helpful to enhance the electrical conductivity. The high strength of Cu-Hf-Si alloy is mainly due to the multiprecipitates synergistic strengthening.image & COPY; 2023 WILEY-VCH GmbH
Keyword ：
aging aging Cu-Hf-Si alloys Cu-Hf-Si alloys electrical conductivity electrical conductivity mechanical properties mechanical properties precipitates precipitates
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| GB/T 7714 | Shi, Bingbing , Hong, Du , Wang, Wenweijiao et al. A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy [J]. | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (21) . |
| MLA | Shi, Bingbing et al. "A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy" . | ADVANCED ENGINEERING MATERIALS 25 . 21 (2023) . |
| APA | Shi, Bingbing , Hong, Du , Wang, Wenweijiao , Su, Longshui , Wang, Chen , Xiao, Lei et al. A Novel Precipitation-Strengthened Conductive Copper Alloy: Cu-Hf-Si Alloy . | ADVANCED ENGINEERING MATERIALS , 2023 , 25 (21) . |
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Cu-1.0Cr-0.1Zr alloy strips were prepared by solution, cold rolling and aging processes. The effects of aging process on the conductivity, mechanical properties and microstructure of the alloy were studied, and the precipitation kinetics was analyzed. The results showed that the Cu-1.0Cr-0.1Zr alloy exhibited the best comprehensive properties after aging at 430 degrees C for 180 min, with an electrical conductivity of 85.86% IACS, a hardness of HV 176.54, and a tensile strength of 552 MPa. For the samples aged at 430 degrees C from 30 to 180 min, the fcc-Cr and Cu8Zr3 phases grew from-5 to-8 nm, and the relationship between the precipitates and matrix changed from coherent to semi-coherent. In addition, the rod-like and spherical coarse particles (>= 300 nm) of bcc-Cr phase were observed. The precipitation kinetics equations at different aging temperatures were established, the time-temperature-transformation (TTT) curve was plotted, and the precipitation activation energy was obtained as 65 kJ/mol.
Keyword ：
conductivity conductivity Cu-Cr-Zr alloy Cu-Cr-Zr alloy mechanical properties mechanical properties precipitates precipitates precipitation kinetics precipitation kinetics
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| GB/T 7714 | Yang, Hai-te , Wang, Wen-wei-jiao , Wang, Chen et al. Effects of aging process on properties and precipitation kinetics of Cu-Cr-Zr alloy strips [J]. | TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA , 2023 , 33 (8) : 2439-2448 . |
| MLA | Yang, Hai-te et al. "Effects of aging process on properties and precipitation kinetics of Cu-Cr-Zr alloy strips" . | TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 33 . 8 (2023) : 2439-2448 . |
| APA | Yang, Hai-te , Wang, Wen-wei-jiao , Wang, Chen , Wang, Jian , Zhou, Jian-hui , Tong, Chang-qing et al. Effects of aging process on properties and precipitation kinetics of Cu-Cr-Zr alloy strips . | TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA , 2023 , 33 (8) , 2439-2448 . |
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