Deformation crossover in nanocrystalline Zr micropillars: The strongest external size

被引：21
|
作者：
Zhang, J. Y. [1 ]
Cui, J. C. [1 ]
Liu, G. [1 ]
Sun, J. [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源：
SCRIPTA MATERIALIA | 2013年 / 68卷 / 08期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Nanocrystalline Zr micropillar; Plastic deformation; Strength; Size effect; MECHANICAL-BEHAVIOR; PLASTICITY;
D O I：
10.1016/j.scriptamat.2012.12.024
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
For small-scale metallic single crystals, systematic studies have established that external sample size (phi) has an obvious influence on the apparent strength, following a "smaller is stronger" fashion. In the present nanocrystalline (NC) Zr micropillars, deformation crossover leads to the strongest external size emerging at a critical phi approximate to 400 nm, similar to that of bulk-scaled NC metals. Above the critical external size the NC Zr pillars failed via highly inhomogeneous single-shear offset, below which they deformed via relative homogeneous shear. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：639 / 642
页数：4
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