Microcrack initiation and dislocation structures in an aluminium bicrystal under cyclic loading

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	Microcrack initiation and dislocation structures in an aluminium bicrystal under cyclic loading
	S. X. Li; R. Q. Chu; J. Y. Hou; Z. G. Wang
	1998
发表期刊	Philosophical Magazine a-Physics of Condensed Matter Structure Defects and Mechanical Properties
ISSN	0141-8610
卷号	77 期号:4 页码:1081-1092
摘要	Tension-tension cyclic deformation of a [(1) over bar 23]-[(4) over bar 55] aluminium bicrystal with the stress axis parallel to the grain boundary (GB) was performed under load control at room temperature. At a lower stress amplitude, in the early stage of fatigue the dislocation configuration in both component crystals was characterized by an irregular cell-like structure. After 2 x 10(6) cycles, at the same lower stress amplitude, the dislocation density in some ceilings or floors of irregular cell-like structure increased, and these dislocations lined up in straight lines that corresponded to the persistent slip lines on the surfaces of the two component crystals. At an intermediate stress amplitude the irregular cell-like structure changed to a regular cell-like structure in the single-slip component [(1) over bar 23], while the irregular cell-like structure still remained in the double-slip component [(4) over bar 55]. At a higher stress amplitude the regular cell-like structure turned to a]adder-like structure in the single slip component. The microcracks were approximately parallel to the GB, and they were 3-5 mu m apart from the GB and emerged preferentially in the single slip component. A possible mechanism of microcrack initiation by voiding was suggested.
部门归属	acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china.;li, sx (reprint author), acad sinica, inst met res, state key lab fatigue & fracture mat, shenyang 110015, peoples r china
关键词	Copper Single-crystals Strain Amplitudes Crack Initiation Fatigued Copper Growth Deformation Microstructures Polycrystals Vector Damage
URL	查看原文
WOS记录号	WOS:000072730700017
引用统计	被引频次：11[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/321006/37706
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. X. Li,R. Q. Chu,J. Y. Hou,et al. Microcrack initiation and dislocation structures in an aluminium bicrystal under cyclic loading[J]. Philosophical Magazine a-Physics of Condensed Matter Structure Defects and Mechanical Properties,1998,77(4):1081-1092.
APA	S. X. Li,R. Q. Chu,J. Y. Hou,&Z. G. Wang.(1998).Microcrack initiation and dislocation structures in an aluminium bicrystal under cyclic loading.Philosophical Magazine a-Physics of Condensed Matter Structure Defects and Mechanical Properties,77(4),1081-1092.
MLA	S. X. Li,et al."Microcrack initiation and dislocation structures in an aluminium bicrystal under cyclic loading".Philosophical Magazine a-Physics of Condensed Matter Structure Defects and Mechanical Properties 77.4(1998):1081-1092.