Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue

被引：16

作者：

Wang, G. Y. ^{[1
]}

Liaw, P. K. ^{[1
]}

Yokoyama, Y. ^{[2
]}

Inoue, A. ^{[2
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Tohoku Univ, Inst Mat Res, Adv Res Ctr Metall Glasses, Sendai, Miyagi 9808577, Japan

来源：

INTERMETALLICS | 2012年 / 23卷

基金：

美国国家科学基金会;

关键词：

Fatigue resistance and crack growth; Glasses; metallic; Mechanical testing; CRACK-PROPAGATION; STRUCTURAL RELAXATION; AMORPHOUS-ALLOYS; BEHAVIOR; FRACTURE; MORPHOLOGY; COMPOSITE; STEELS;

D O I：

10.1016/j.intermet.2011.12.018

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：

Four-point-bend fatigue experiments are conducted on rectangular beam samples of a Zr50Cu37Al10Pd3 (in atomic percent) bulk metallic glass (BMG). In general, a fatigue crack initiates from the corner of the beam sample at the tensile stress surface and subsequently grows inside during cyclic loading. As a result, many shear bands form around the crack growth path due to the plastic deformation at the crack tip. Moreover, the size of the shear-band zone shows a good relationship with the stress intensity factor range, which is similar to the plastic zone in the crystalline alloys. Moreover, the shear-band spacing is consistent with the coarse fatigue striation spacing, which implies that the fatigue-crack growth in BMGs is related to the formation of shear bands. A reasonable mechanism is proposed to understand the fatigue-crack-growth behavior in BMGs. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：96 / 100

页数：5

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