Critical dimension for the dislocation structure in deformed copper micropillars

被引:16
作者
Zhao, X. X. [1 ]
Wu, J. [1 ]
Chiu, Y. L. [1 ]
Jones, I. P. [1 ]
Gu, R. [2 ]
Ngan, A. H. W. [3 ]
机构
[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
[2] Southern Univ Sci & Technol, Mat Characterizat & Preparat Ctr, 1088 Xueyuan Rd, Shenzhen, Guangdong, Peoples R China
[3] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China
关键词
Copper; Micropillar; Dislocation cell; Fractal; Focussed ion beam (FIB); STOCHASTIC NATURE; SIZE DEPENDENCE; YIELD STRENGTH; DEFORMATION; PLASTICITY; INSIGHTS; SCALE; LAW;
D O I
10.1016/j.scriptamat.2019.01.020
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than similar to 1 mu m, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 mu m, 3 mu m and 5 mu m. Dislocation cells formed in a fractal geometry in the 3 mu m and 5 mu m pillars, while dislocations were not retained in the 1 mu m pillars. The effects of strain and strain rate on cell formation were also investigated. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:137 / 141
页数:5
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