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Varying tensile fracture mechanisms of Cu and Cu-Zn alloys with reduced grain size: From necking to shearing instability
P. Zhang; S. Qu; M. X. Yang; G. Yang; S. D. Wu; S. X. Li; Z. F. Zhang
2014
Source PublicationMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
Volume594Pages:309-320
AbstractIn ultrafine-grained (UFG) or nanocrystalline (NC) materials, achieving high strength often induces loss of ductility due to the formation of shear fracture without obvious necking feature. To investigate mechanical properties and fracture mechanism with reduced grain size, the macroscopic tensile fracture behaviors of UFG or NC Cu and Cu-Zn alloys were systematically investigated. It is found that the tensile strength and uniform elongation of UFG or NC Cu and Cu-Zn alloys display simultaneously increasing trend. The limitation of ductility can be attributed to the occurrence of shear bands in these materials; their main characteristic, the shear fracture angle, decreases with decreasing grain size as well as the degree of necking. The macroscopic fracture mechanisms are explained using an Ellipse criterion in terms of modification of the stress state in the fracture zone. It is suggested that the reduction of necking degree results from the geometrical hardening effect due to the change of the stress state. As the degree of necking decreases with decreasing grain size, the tensile shear fracture angle decreases too in the UFG/NC materials. Thus improving the geometrical hardening ability may effectively inhibit the formation of shear fracture, as the nucleation of shear bands becomes difficult. (C) 2013 Elsevier B.V. All rights reserved.
description.department[zhang, p. ; qu, s. ; wu, s. d. ; li, s. x. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [yang, m. x. ; yang, g.] cent iron & steel res inst, beijing 100081, peoples r china. ; zhang, zf (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhfzhang@imr.ac.cn
KeywordCu-zn Alloy Equal-channel Angular Pressing (Ecap) Strength Fracture Mechanism Necking Shear Fracture Stacking-fault Energy High-pressure Torsion Severe Plastic-deformation Al Alloys Microstructural Evolution Nanocrystalline Materials Single-crystal Ductility Strength Orientation
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72601
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
P. Zhang,S. Qu,M. X. Yang,et al. Varying tensile fracture mechanisms of Cu and Cu-Zn alloys with reduced grain size: From necking to shearing instability[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2014,594:309-320.
APA P. Zhang.,S. Qu.,M. X. Yang.,G. Yang.,S. D. Wu.,...&Z. F. Zhang.(2014).Varying tensile fracture mechanisms of Cu and Cu-Zn alloys with reduced grain size: From necking to shearing instability.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,594,309-320.
MLA P. Zhang,et al."Varying tensile fracture mechanisms of Cu and Cu-Zn alloys with reduced grain size: From necking to shearing instability".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 594(2014):309-320.
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