Evolution of shear bands into cracks in metallic glasses

被引：21
作者：
Zhao, Yuan-Yun [1 ,2 ]
Zhang, Guangliang [3 ]
Estevez, Diana [1 ,2 ]
Chang, Chuntao [1 ,2 ]
Wang, Xinmin [1 ,2 ]
Li, Run-Wei [1 ,2 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Ningbo 315201, Zhejiang, Peoples R China
[3] Taizhou Univ, Sch Mech Engn, Taizhou 318000, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 621卷
关键词：
Metallic glasses; Crack propagation; Shear band; Mechanical properties; BULK AMORPHOUS-ALLOYS; PLASTICITY; FRACTURE; FLOW; DEFORMATION; BRITTLENESS; COMPRESSION; TEMPERATURE; MECHANISM; STRENGTH;
D O I：
10.1016/j.jallcom.2014.09.205
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In the present work, the cracks formation and propagation behavior of a ductile Zr-based bulk metallic glass with single dominant shear band deformation was investigated. From the ideal compressive load-displacement curve of the sample with single shear band deformation, the instant at which the shear band turns into cracks and the total area of cracked-regions prior to failure were analyzed. Further investigations revealed that the micro-cracks might have originated from the local planar faults or defects within the shear plane along the shear direction. The existence of such planar faults (steps) was consistent with the observations of the surfaces of unfractured and fractured samples. Based on these results, a new interpretation of how shear bands evolve into the present micro-cracks was proposed. These novel results provide a new perspective to understand the deformation behavior of metallic glasses. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：238 / 243
页数：6
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