Size effects in strength and plasticity of single-crystalline titanium micropillars with prismatic slip orientation

被引：85

作者：

Sun, Qiaoyan ^{[1
,2
]}

Guo, Qiang ^{[2
]}

Yao, Xi ^{[1
]}

Xiao, Lin ^{[1
]}

Greer, Julia R. ^{[2
]}

Sun, Jun ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China

[2] CALTECH, Dept Appl Phys & Mat Sci, Pasadena, CA 91125 USA

来源：

SCRIPTA MATERIALIA | 2011年 / 65卷 / 06期

关键词：

Titanium; Size effects; Prismatic slip; Dislocations; Mechanical properties; SCALE; MICROCOMPRESSION; DEFORMATION; MOLYBDENUM; BEHAVIOR; TENSILE;

D O I：

10.1016/j.scriptamat.2011.05.033

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present results of uniaxial compression experiments on rectangular prismatic titanium micropillars loaded along [11 (2) over bar0]. We find that flow stress increases significantly with decreasing pillar size down to 300 nm, with a slope of -0.5 on the log-log scale. The strength of 300 nm pillars is 1040 MPa, reaching 16% of the theoretical strength of titanium. We observe wavy lines for samples with diameters greater than 1 mu m. The critical resolved shear stress is inversely proportional to the sample size, consistent with dislocation source nucleation-controlled plasticity. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：473 / 476

页数：4

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