Low temperature uniform plastic deformation of metallic glasses during elastic iteration

被引：30
|
作者：
Fujita, Takeshi [1 ]
Wang, Zheng [2 ]
Liu, Yanhui [1 ]
Sheng, Howard [3 ]
Wang, Weihua [2 ]
Chen, Mingwei [1 ,4 ]
机构：
[1] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] George Mason Univ, Sch Phys Astron & Computat Sci, Fairfax, VA 22030 USA
[4] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China
来源：
ACTA MATERIALIA | 2012年 / 60卷 / 09期
关键词：
Metallic glasses; Simulation; Plastic deformation; MECHANICAL-BEHAVIOR; SHEAR BANDS; STATE; FLOW;
D O I：
10.1016/j.actamat.2012.03.032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Molecular dynamics simulations and dynamic mechanical analysis experiments were employed to investigate the mechanical behavior of metallic glasses subjected to iteration deformation in a nominally elastic region. It was found that cyclic deformation leads to the formation of irreversible shear transformation zones (STZs) and a permanent uniform strain. The initiation of STZs is directly correlated with the atomic heterogeneity of the metallic glass and the accumulated permanent strain has a linear relation with the number of STZs. This study reveals a new deformation mode and offers insights into the atomic mechanisms of STZ formation and low temperature uniform plastic deformation of metallic glasses. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3741 / 3747
页数：7
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