Shear banding behavior and fracture mechanisms of Zr55Al10Ni5Cu30 bulk metallic glass in uniaxial compression analyzed using a digital image correlation method

被引：31

作者：

Joo, Soo-Hyun ^{[1
]}

Kato, Hidemi ^{[2
]}

Gangwar, Kapil ^{[1
]}

Lee, Sunghak ^{[3
]}

Kim, Hyoung Seop ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Pohang Univ Sci & Technol, Ctr Aerosp Mat, Pohang 790784, South Korea

来源：

INTERMETALLICS | 2013年 / 32卷

基金：

新加坡国家研究基金会;

关键词：

Glasses; metallic; Mechanical properties at ambient temperature; Plastic deformation mechanisms; Mechanical testing; STRAIN; DEFORMATION; ALLOYS; FLOW; TEMPERATURE; STRENGTH;

D O I：

10.1016/j.intermet.2012.08.013

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：

The shear banding behavior and fracture mechanisms of a Zr55Al10Ni5Cu30 bulk metallic glass (BMG) were investigated using uniaxial compression tests equipped with a digital image correlation (DIC) method system. The DIC results captured the shear bands correctly, and the Zr-based BMG exhibited two deformation modes depending on the strain rate. In the fast mode under a strain rate of 1.0 x 10(-2) s(-1), multiple shear banding was observed. The effects of shear band interactions were observed in the DIC results, and the results were analyzed in terms of the serrated plastic flow. The stair shaped fracture pattern and slipped vein pattern found on the fracture surface were strong evidence of the shear band interactions. However, the plastic deformation was confined to a few shear bands without shear band interactions in the slow mode under a strain rate of 1.0 x 10(-4) s(-1). From quantitative analyses, it was found that the shear bands propagated progressively rather than simultaneously at the beginning of the shear band formation. Then, the propagation became simultaneous after the shear band formation was completed through the entire shear planes. This progressive propagation behavior caused strain heterogeneity, which increased after each reactivation event. Also, two shear bands propagated simultaneously without interactions in the direct observations, which represented a load drop in serrated flow. Furthermore, it was revealed that there were different fracture mechanisms depending on the strain rate and deformation mode. This comprehensive quantitative analysis of the shear banding behavior and fracture mechanisms of BMGs enables better understanding and design of superior BMGs. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：21 / 29

页数：9

共 36 条

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