Effect of external disturbances on the strain-rate dependent plastic deformation behavior of a bulk metallic glass

被引：11
作者：
Chen, S. H. [1 ]
Yue, T. M. [1 ]
Tsui, C. P. [1 ]
Chan, K. C. [1 ]
机构：
[1] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Adv Mfg Technol Res Ctr, Kowloon, Hong Kong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 669卷
关键词：
Bulk metallic glass; Plastic deformation; Geometric confinement; Stress gradient; Shear bands; ROOM-TEMPERATURE; STRESS GRADIENT; SHEAR BANDS; ENHANCEMENT; COMPRESSION; SIZE; FLOW;
D O I：
10.1016/j.msea.2016.05.090
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this work, the effect of external disturbances on the strain-rate dependent plastic deformation behavior of a Zr57Cu20Al10Ni8Ti5 bulk metallic glass (BMG) has been examined by tailoring the geometric confinement, stress gradient, and sample size. With the external disturbances, the fracture strains of the BMG specimens become less dependence on the strain rates, and it is found that the confinement of the propagation of shear bands is the dominant deformation mechanism. This is different from previous findings in that multiplication of the shear bands also plays a critical role in accommodating the plastic deformation of BMGs with external disturbances. The present findings not only shed more light on the deformation mechanisms of BMGs under external disturbances, but also suggest that the use of external disturbances can reduce the dependence of the plastic deformation behavior of BMGs on the strain rates. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：103 / 109
页数：7
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