Cyclic deformation features of a copper bicrystal with an embedded grain and surrounding grain boundary

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	Cyclic deformation features of a copper bicrystal with an embedded grain and surrounding grain boundary
	Zhang, ZF; Wang, ZG
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	1999-11-01
卷号	271 期号:1-2 页码:449-457
关键词	copper bicrystal embedded grain grain boundary (GB) cyclic stress-strain (CSS) curve slip morphology dislocation pattern
ISSN号	0921-5093
通讯作者	Zhang, ZF()
英文摘要	Cyclic stress-strain response, surface slip morphology and saturation dislocation patterns in a copper bicrystal with an embedded grain G(E) and a surrounding grain boundary (GB) were investigated and compared with those of its matrix monocrystal by multi-step cyclic straining at room temperature in air. The experimental results showed that the cyclic stress-strain (CSS) curve of the matrix monocrystal exhibited a plateau region with the saturation resolved shear stresses of 28.8-29.4 MPa in the plastic resolved shear strain range of 4.7 x 10(-4)-3.18 x 10(-3). However, the copper bicrystal displayed relatively higher saturation stresses of 32.2-36.0 MPa, if modified by the orientation factor of the matrix grain, indicating no apparent plateau region in its CSS curve. Surface observations revealed that the primary slip system was dominant in both grains G(M) and G(E) except near the surrounding GB. By the electron channeling contrast (ECC) technique in scanning electron microscopy (SEM), the dislocation patterns of the bicrystal and the matrix monocrystal were observed. It was found that the two-phase structure of persistent slip bands (PSBs) and dislocation veins can nucleate in both grains G(M) and G(E) after cyclic deformation of the bicrystal. Based on the experimental results above, the effects of the surrounding GB and the embedded grain G(E) on the cyclic stress-strain response of the bicrystal were discussed. Those results might provide an experimental evidence for understanding the difference in CSS curves between copper single- and poly-crystals. (C) 1999 Elsevier Science S.A. All rights reserved.
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000083647800058
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/108987]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, ZF
作者单位	Chinese Acad Sci, Met Res Inst, State Key Lab Fatigue & Fracture Mat, Shenyang 110015, Peoples R China
推荐引用方式 GB/T 7714	Zhang, ZF,Wang, ZG. Cyclic deformation features of a copper bicrystal with an embedded grain and surrounding grain boundary[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,1999,271(1-2):449-457.
APA	Zhang, ZF,&Wang, ZG.(1999).Cyclic deformation features of a copper bicrystal with an embedded grain and surrounding grain boundary.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,271(1-2),449-457.
MLA	Zhang, ZF,et al."Cyclic deformation features of a copper bicrystal with an embedded grain and surrounding grain boundary".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 271.1-2(1999):449-457.