Stress-induced structural transformation and shear banding during simulated nanoindentation of a metallic glass

被引：131
|
作者：
Shi, Yunfeng [1 ]
Falk, Michael L. [1 ]
机构：
[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 13期
基金：
美国国家科学基金会;
关键词：
molecular dynamics; nanoindentation; metallic glasses; shear bands; incipient plasticity;
D O I：
10.1016/j.actamat.2007.03.029
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Simulated nanoindentation tests on a three-dimensional model of a binary metallic glass-forming alloy reveal how the stress field and material structure interact to control deformation beneath the indenter. Initially, the stress field follows the Hertzian solution with fluctuations due to heterogeneities. Homogeneous or localized plastic deformation arises, depending on the processing history of the material. In the case of localized deformation, the first shear band initiates sub-surface, relaxing the local shear stress. The subsequent shear band morphology is observed to be rate-dependent. Deformation induced changes in material structure are characterized in terms of short-range ordering and free volume, with the former providing significantly greater signal-to-noise. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4317 / 4324
页数：8
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