Comparison of fatigue cracking possibility along large- and low-angle grain boundaries

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	Comparison of fatigue cracking possibility along large- and low-angle grain boundaries
	Z. F. Zhang; Z. G. Wang
	2000
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	284 期号:1-2 页码:285-291
摘要	In this paper, intergranular fatigue cracking possibility along large- and low-angle grain boundaries (GBs) was compared by using a copper bicrystal with embedded grains. It was found that secondary slip lines were always activated near the large-angle GB segment owing to the plastic strain incompatibility and those slip bands couldn't pass through the GB. However, the slip bands showed a good one-to-one correlation across the low-angle GB segment without the operation of secondary slip. If the cyclic number was high enough, fatigue cracks firstly initiated along the large-angle GB segment, but no fatigue crack could be observed along the low-angle GB segment. With the help of the electron channelling contrast (ECC) technique in SEM, the fatigued dislocation patterns near the GBs were observed. Those observations provided a direct evidence on the interactions of persistent slip bands (PSBs) with GBs. Based on the experimental results, the dependence of intergranular fatigue cracking on the interaction modes of PSBs with different kinds of GBs is discussed. A defect model (including dislocations and vacancies) leading to intergranular fatigue cracking is proposed. Because the defects carried by PSBs beside a large-angle GB are often piled-up, i.e. 'piling-up of defects', and make a contribution to fatigue cracking along the large-angle GB segment. On the contrary, the defects carried by PSBs call pass through the low-angle GBs and be moved into the adjacent grain. This process is defined as 'passing-through of defects' and cannot lead to the fatigue cracking along the low-angle GB. (C) 2000 Elsevier Science S.A. All rights reserved.
部门归属	acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;zhang, zf (reprint author), acad sinica, inst met res, state key lab fatigue & fracture mat, 72 wenhua rd, shenyang 110015, peoples r china
关键词	Cyclic Deformation Large-angle Grain Boundary Low-angle Grain Boundary Fatigue Cracking Electron Channeling Contrast Copper Single-crystals Metals Fracture Model
URL	查看原文
WOS记录号	WOS:000086906500033
引用统计	被引频次：75[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/321006/37262
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. Comparison of fatigue cracking possibility along large- and low-angle grain boundaries[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2000,284(1-2):285-291.
APA	Z. F. Zhang,&Z. G. Wang.(2000).Comparison of fatigue cracking possibility along large- and low-angle grain boundaries.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,284(1-2),285-291.
MLA	Z. F. Zhang,et al."Comparison of fatigue cracking possibility along large- and low-angle grain boundaries".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 284.1-2(2000):285-291.