Low cycle fatigue of a copper bicrystal under constant plastic strain control

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	Low cycle fatigue of a copper bicrystal under constant plastic strain control
	Y. M. Hu ; Z. G. Wang
刊名	International Journal of Fatigue
	1997
卷号	19 期号:1 页码:59-65
关键词	fatigue copper bicrystal cyclic deformation cracking single-crystals polycrystalline copper dislocation-structures grain-boundaries amplitude slip behavior deformation stress morphology
ISSN号	0142-1123
中文摘要	Symmetrical tension-compression fatigue tests in an axial plastic strain range of 0.12x10(-3) to 2.75x10(-3) were performed on a copper bicrystal containing two highly misoriented component crystals one of which is oriented for single slip and another is oriented very closely for double slip. The grain boundary (GB) is roughly perpendicular to stress axis. Experimental results showed that this bicrystal exhibited a very high saturation stress and did not exhibit an apparent plateau in the cyclic stress-strain (CSS) curve. It seems that no persistent slip bands formed under higher strain amplitudes according to the analysis of the change of fatigue loop shape. Surface observation showed that at least three slip systems operated in both of the components of the bicrystal due to constraints of GB. The occurrence of multiple slip, which may result in very strong dislocation interaction, is considered to be responsible for the features of the CSS curve of the bicrystal. Intergranular microcracks and relatively large intergranular macro-cracks were frequently observed on the specimen surfaces even though small cumulative strains were applied. Apparently, the GB plays the most important role in the fatigue failure of the bicrystal to be studied. Copyright (C) 1997 Elsevier Science Limited.
原文出处	://WOS:A1997WG40100007
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37976]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. M. Hu,Z. G. Wang. Low cycle fatigue of a copper bicrystal under constant plastic strain control[J]. International Journal of Fatigue,1997,19(1):59-65.
APA	Y. M. Hu,&Z. G. Wang.(1997).Low cycle fatigue of a copper bicrystal under constant plastic strain control.International Journal of Fatigue,19(1),59-65.
MLA	Y. M. Hu,et al."Low cycle fatigue of a copper bicrystal under constant plastic strain control".International Journal of Fatigue 19.1(1997):59-65.