Effect of pre-existing shear bands on the tensile mechanical properties of a bulk metallic glass

被引：126

作者：

Cao, Q. P. ^{[1
,2
]}

Liu, J. W. ^{[1
,2
]}

Yang, K. J. ^{[3
]}

Xu, F. ^{[1
,2
]}

Yao, Z. Q. ^{[3
]}

Minkow, A. ^{[3
]}

Fecht, H. J. ^{[3
,4
]}

Ivanisenko, J. ^{[4
]}

Chen, L. Y. ^{[1
,2
]}

Wang, X. D. ^{[1
,2
]}

Qu, S. X. ^{[1
,5
]}

Jiang, J. Z. ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Int Ctr New Struct Mat ICNSM, Hangzhou 310027, Zhejiang, Peoples R China

[2] Zhejiang Univ, Dept Mat Sci & Engn, Lab New Struct Mat, Hangzhou 310027, Zhejiang, Peoples R China

[3] Univ Ulm, Inst Micro & Nanomat, D-89091 Ulm, Germany

[4] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[5] Zhejiang Univ, Inst Appl Mech, Sch Aeronaut & Astronaut, Hangzhou 310027, Zhejiang, Peoples R China

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 04期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Metallic glasses; Rolling; Shear bands; Tension test; In situ SEM; SUPERCOOLED LIQUID; DEFORMATION; BEHAVIOR; MICROSTRUCTURE; INITIATION; CRITERION; STRENGTH; ALLOY;

D O I：

10.1016/j.actamat.2009.10.032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Bulk Zr64.13Cu15.75Ni10.12Al10 metallic glass has been rolled at room temperature in two different directions, and the dependences of microstructure and tensile mechanical property on the degree of deformation and rolling directions have been investigated. No deformation-induced crystallization occurs except for shear bands. Shear band formation in conjugated directions is achieved in the specimen rolled in two directions, while rolling in one direction induces shear band formation only in a single direction. Pre-existing properly spaced soft inhomogeneities can stabilize shear bands and lead to tensile plastic strain, and the efficient intersection of shear bands in conjugated directions results in work-hardening behavior, which is further confirmed by in situ tensile scanning electron microscopic observation. Based on the experimental results obtained in two different specimen geometries and finite element analysis, it is deduced that a normal-stress-modified maximum shear stress criterion rather than a shear plane criterion can describe the conditions for the formation of shear bands in uniaxial tension. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1276 / 1292

页数：17

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