From size-dependent strengthening to softening in nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars

被引：3
|
作者：
Wang, Y. Q. [1 ]
Liang, X. Q. [1 ]
Wu, K. [1 ]
Zhang, J. Y. [1 ]
Liu, G. [1 ]
Sun, J. [1 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 732卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Crystalline/amorphous nanolaminates; Micropillars; Flow stress; Size effect; Deformation behavior; SHEAR BANDS; DEFORMATION; PLASTICITY; MECHANISMS; TRANSITION; BEHAVIOR;
D O I：
10.1016/j.msea.2018.06.079
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Microcompressive tests were performed to investigate the intrinsic modulation effect and extrinsic diameter effect on strength and deformation behaviors of nanolaminated Cu/Cu-Zr crystalline/amorphous micropillars within a diameter D range from 300 to 1500 nm as well as a modulation ratio eta range from 0.1 to 3.0. Experimental results revealed a transition of D-dependent deformation mode from homogeneous-like to shear localization at large eta, while D-independent homogeneous extrusion of Cu at small eta. Furthermore, the flow strength increased with raising D at small eta, but decreased at large eta, exhibiting a D-insensitive strength at a critical eta* similar to 0.5. These unusual results were rationalized in terms of a coupling effect of dislocation actions and shear transformation zone mediated operations.
引用
收藏
页码：29 / 34
页数：6
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