A transition from localized shear banding to homogeneous superplastic flow in nanoglass

被引：111

作者：

Adibi, Sara ^{[1
,2
]}

Sha, Zhen-Dong ^{[1
,3
]}

Branicio, Paulo S. ^{[1
]}

Joshi, Shailendra P. ^{[2
]}

Liu, Zi-Shun ^{[3
]}

Zhang, Yong-Wei ^{[1
]}

机构：

[1] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore

[2] Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore

[3] Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Int Ctr Appl Mech, Xian 710049, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 21期

基金：

中国国家自然科学基金;

关键词：

METALLIC GLASSES; MOLECULAR-DYNAMICS; TENSILE DUCTILITY; AMORPHOUS-ALLOYS; SIZE; DEFORMATION; PLASTICITY; STABILITY;

D O I：

10.1063/1.4833018

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A promising remedy to the failure of metallic glasses (MGs) by shear banding is the use of a dense network of glass-glass interfaces, i.e., a nanoglass (NG). Here we investigate the effect of grain size (d) on the failure of NG by performing molecular dynamics simulations of tensile-loading on Cu50Zr50 NG with d = to 15 nm. Our results reveal a drastic change in deformation mode from a single shear band (d similar to 15 to 10 nm), to cooperative shear failure (d similar to 10 to 5 nm), to homogeneous superplastic flow (d <= 5 nm). Our results suggest that grain size can be an effective design parameter to tune the mechanical properties of MGs. (C) 2013 AIP Publishing LLC.

引用

页数：5

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