期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 12, 页码 4259-4267出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.12.080
关键词
Cu-Zn alloy; Stacking fault energy (SFE); Equal channeling angular pressing (ECAP); Strengthen; Ductility
类别
资金
- National Natural Science Foundation of China (NSFC) [50625103, 50890173, 50931005]
- National Basic Research Program of China [2010CB631006]
Ultrafine-grained (UFG) Cu and Cu-Zn alloy were prepared using equal-channel angular pressing (ECAP) to investigate the effects of stacking fault energy (SFE) on microstructure evolution and mechanical properties. Combining with the previous researches, the grain refinement process of ECAP is divided into three stages based on the variation of tensile strength and plasticity. According to the influences of defects on strength and ductility during plastic deformation, the three stages are discussed in detail by considering the dislocation density, grain and twin boundaries. Besides, the impact of SFE on the strength and ductility of the UFG Cu-Zn alloys are evaluated, indicating that these two mechanical properties can be improved simultaneously in the whole ECAP process either through slightly or widely adjusting the SFE. This significant effect of SFE reflects in two aspects, one is in the microstructure evolution during ECAP processing and the other is in the subsequent tensile plastic deformation, both of which can be achieved through regulating the dislocation motion via changing the SFE. (C) 2011 Elsevier B.V. All rights reserved.
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