期刊
ACTA MATERIALIA
卷 58, 期 4, 页码 1276-1292出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.10.032
关键词
Metallic glasses; Rolling; Shear bands; Tension test; In situ SEM
资金
- National Natural Science Foundation of China [50701038, 50601021, 6077 6014, 60876002, 10804096, 50890174, 10702062]
- China Postdoctoral Science Foundation project fund [20070421157, 200801451]
- Zhejiang University-Helmholtz cooperation fund
- Ministry of Education of China
- Department of Science and Technology of Zhejiang province and Zhejiang University
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.
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