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| 纯金剪切变形后的加工硬化 |
| Work hardening of pure gold after shear deformation |
| 投稿时间：2021-11-24 |
| DOI： |
| 中文关键词: 金属材料 纯金 剧烈塑性变形 晶粒细化 加工硬化 |
| 英文关键词: metal materials pure gold severe plastic deformation grain refinement work hardening |
| 基金项目:国家自然科学基金面上项目(52074160) |
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| 摘要点击次数: 774 |
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| 中文摘要: |
| 采用一种能够提供大应变量的剪切变形方法，对质量分数为99.99%的高纯金施加剪切变形，采用电子背散射衍射技术(EBSD)和维氏显微硬度计对其显微组织和力学性能进行表征。剪切变形后，纯金样品的平均晶粒尺寸细化两个数量级，由退火态的56±4 μm细化至526±30 nm，组织均匀，并且表现出弱织构，大量的退火孪晶在变形过程中消失；显微硬度(HV0.05)由退火态的30±3提升至72±4。 |
| 英文摘要: |
| A shear deformation method that can provide a large amount of strain was used to apply shear deformation to high purity gold with a mass fraction of 99.99%. Its microstructure and mechanical properties were characterized by electron backscatter diffraction (EBSD) and Vickers microhardness tester. After shear deformation, the average grain size of the pure gold sample is refined by two orders of magnitude, from 56±4 μm to 526±30 nm. Its microstructure is uniform and shows weak texture, and a large number of annealing twins disappear during deformation. Its microhardness (HV0.05) increases from 30±3 to 72±4. |
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