Orientation dependence of dislocation structure in surface grain of pure copper deformed in tension
Orientation dependence of dislocation structure in surface grain of pure copper deformed in tension
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DOI：
10.1016/j.actamat.2020.11.016
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发表时间：
2021-01
期刊：
影响因子：
9.4
通讯作者：
Qingqing Sun;Y. Ni;Shuai Wang
中科院分区：
文献类型：
--
作者：
Qingqing Sun;Y. Ni;Shuai Wang
研究了拉伸变形纯铜表面晶粒中位错结构的取向依赖性，并与块体晶粒中的位错结构进行了比较。在给定应变下，位错单元结构在[100]-[100]表面晶粒中占主导地位，其遵循与块体对应物相同的规则。对于[110]-[110]和[110]-[111]，应变范围内的块体晶粒主要由位错单元块结构主导，而具有相同晶格旋转历史的表面晶粒可以发展成单元块结构或位错单元/缠结结构，具体取决于晶粒几何形状和应变水平。由于表面的像力，位错结构的演化在表面晶粒中被推迟。结果表明，纯铜表面晶粒的位错演化不仅与取向相关，而且与晶粒几何形状密切相关。
Orientation dependence of dislocation structure in surface grain of pure copper deformed in tension was investigated and compared with that in bulk grain. Dislocation cell structure is dominated in [100]-[100] surface grain at a given strain, which follows the same rule with its bulk counterpart. For [110]-[110] and [110]-[111], bulk grains in a strain range are dominated by dislocation cell block structures, while surface grains with the same lattice rotation history can develop into either a cell block structure or dislocation cell/tangle structure, depending on the grain geometry and strain level. Dislocation structure evolution is postponed in surface grains due to the image force of the surface. The results indicate that dislocation evolution in surface grain of pure copper is not only orientation-dependent, but also strongly related with grain geometry.