Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals

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	Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals
	J. Xu; G. P. Zhang
	2014
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	590 页码:194-198
摘要	Grain size and initial dislocation density introduced by different mechanical processing methods may have a strong influence on fatigue behavior of polycrystalline metals. Using the reaction-diffusion model developed by Walgraef and Aifantis, we examined the ability of fatigue dislocation patterning and the evolution of dislocation density in the materials with different grain sizes (100 nm-10 mu m) and initial immobile dislocation densities (IIDD, 1 x 10(12) m(-2)-1.58 x 10(15) m(-2)). The results show that there is a clear relation among the necessary length scale for dislocation patterning, the grain size and the IIDD. Furthermore, the nominal life for fatigue damage initiation of these materials was evaluated based on the evolution of dislocation density and the ability of the dislocation patterning, showing good consistency with the experimental findings. (C) 2013 Elsevier B.V. All rights reserved.
部门归属	[xu, j. ; zhang, g. p.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; zhang, gp (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; gpzhang@imr.ac.cn
关键词	Grain Size Dislocation Density Fatigue Simulation Severe Plastic-deformation Copper Single-crystals Surface-morphology Strain Amplitude Length-scale Films Microstructure Patterns
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72350
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Xu,G. P. Zhang. Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2014,590:194-198.
APA	J. Xu,&G. P. Zhang.(2014).Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,590,194-198.
MLA	J. Xu,et al."Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 590(2014):194-198.