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

来源：

SCRIPTA MATERIALIA | 2019年 / 163卷

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

页码：137 / 141

页数：5

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