Cyclic softening behaviors of ultra-fine grained Cu-Zn alloys

被引：29
|
作者：
Zhang, Z. J. [1 ]
Zhang, P. [1 ]
Zhang, Z. F. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
ACTA MATERIALIA | 2016年 / 121卷
基金：
中国国家自然科学基金;
关键词：
Cu-Zn alloy; Ultra-fine grain; Low-cycle fatigue; Shear bands; Dislocation slip mode; SEVERE PLASTIC-DEFORMATION; STACKING-FAULT ENERGY; FATIGUE PROPERTIES; MICROSTRUCTURAL EVOLUTION; NANOCRYSTALLINE METALS; MECHANICAL-PROPERTIES; PLANAR-SLIP; SHEAR BANDS; AL ALLOYS; COPPER;
D O I：
10.1016/j.actamat.2016.09.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Low-cycle fatigue tests were carried out on ultra-fine grained (UFG) Cu and Cu-Zn alloys to reveal the mechanisms of cyclic softening and the effects of dislocation slip mode. Based on careful examinations of the grain coarsening (GC), shear band (SB) evolutions and surface hardness change during cyclic deformation, the microscopic mechanisms of the cyclic softening process and the correlations between GC and SBs were deeply revealed. Besides, a general and coincident relationship was found between the softening velocities and the fatigue lives for UFG Cu and Cu alloys. Finally, it is approved that through alloying to increase the slip planarity, the cyclic softening caused by GC and SBs can be largely restrained such that the fatigue life may be improved effectively. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：331 / 342
页数：12
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