Dislocation arrangements within slip bands during fatigue cracking

被引：31

作者：

Li, Linlin ^{[1
]}

Zhang, Zhenjun ^{[1
]}

Zhang, Peng ^{[1
]}

Li, Cuihong ^{[1
]}

Zhang, Zhefeng ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2018年 / 145卷

基金：

中国国家自然科学基金;

关键词：

Cu and Cu alloys; Slip band; Dislocations; Fatigue cracking; Strain localization; Lattice rotation; ELECTRON BACKSCATTER DIFFRACTION; COPPER SINGLE-CRYSTALS; CYCLIC DEFORMATION; STRAIN LOCALIZATION; GRAIN-BOUNDARIES; BEHAVIOR; CU; INITIATION; MICROSTRUCTURE; PROPAGATION;

D O I：

10.1016/j.matchar.2018.08.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructures and dislocations associated with the slip band (SB) fatigue cracks were investigated in Cu single crystal and bicrystal. It is found that there are high strain localizations with abundant dislocation cells around the cracked SBs. Due to the high local strain and slip irreversibility, the lattice rotates severely leading to large misorientation and hence low- or high- angle grain boundaries could form between the neighboring cells. Moreover, the dislocation walls can serve as preferential sites for nucleation and propagation of fatigue cracks with high density of dislocations, vacancies and high strain incompatibility.

引用

页码：96 / 100

页数：5

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