Fatigue-cracking characteristics of a copper bicrystal when slip bands transfer through the grain boundary

IMR OpenIR

	Fatigue-cracking characteristics of a copper bicrystal when slip bands transfer through the grain boundary
	Z. F. Zhang; Z. G. Wang
	2003
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	343 期号:1-2 页码:308-313
摘要	We reported the fatigue cracking characteristics of a special copper bicrystal with a tilt Sigma 19b grain boundary (GB) and a coplanar primary slip system between the two grains. It is found that the primary slip bands of the two adjacent grains have a good continuation across the GB on the four surfaces of the bicrystal specimen in the axial plastic strain range of 1.5 x 10(-4)-2.13 x 10(-3). It indicates that the surface slip bands had transferred through the GB during cyclic deformation. When cyclic plastic strain was continued to be applied on the bicrystal specimens, fatigue cracks always initiated and propagated along the GB at all the applied strain amplitudes. By using electron channeling contrast (ECC) technique in scanning electron microscopy (SEM), the dislocation patterns near the GB of the bicrystal were observed. The ladder-like persistent slip bands (PSBs) did not transfer through the GB continuously, no matter what the surface or the common primary slip plane of the bicrystal. Instead, a dislocation affected zone (DAZ) or piling-up of dislocations near the GB was observed. Based on the results above, the fatigue cracking mechanism of the bicrystal was discussed and the GB cracking was attributed to the difference in the slip directions of the two adjacent grains. (C) 2002 Elsevier Science B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ifw dresden, inst met mat, d-01171 dresden, germany.;zhang, zf (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Copper Bicrystal Grain Boundary Persistent Slip Bands (Psbs) Fatigue Cracking Piling-up Of Dislocations Electron Channeling Contrast Cyclic Deformation Strain Localization Single-crystals Initiation Behavior Polycrystals Propagation Fracture
URL	查看原文
WOS记录号	WOS:000179899400038
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36193
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. F. Zhang,Z. G. Wang. Fatigue-cracking characteristics of a copper bicrystal when slip bands transfer through the grain boundary[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2003,343(1-2):308-313.
APA	Z. F. Zhang,&Z. G. Wang.(2003).Fatigue-cracking characteristics of a copper bicrystal when slip bands transfer through the grain boundary.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,343(1-2),308-313.
MLA	Z. F. Zhang,et al."Fatigue-cracking characteristics of a copper bicrystal when slip bands transfer through the grain boundary".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 343.1-2(2003):308-313.