DETWINNING BEHAVIOR INDUCED BY LOCAL SHEAR STRAIN IN NANOTWINNED Cu

IMR OpenIR

	DETWINNING BEHAVIOR INDUCED BY LOCAL SHEAR STRAIN IN NANOTWINNED Cu
	Bai Jingsheng; Lu Qiuhong; Lu Lei
通讯作者	Lu Lei(llu@imr.ac.cn)
	2016-04-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	52 期号:4 页码:491-496
摘要	Nanotwinned materials have attracted widespread attention due to their superior mechanical properties, such as high strength, good ductility and work hardening. Experimental and molecular dynamics (MD) simulation results had indicated that there are three distinctly different dislocation-mediated deformation mechanisms in nanotwinned metals, namely dislocation pile-up against and slip transfer across twin boundaries (TBs), Shockley partials gliding on twin boundaries leading to twin boundary migration, and threading dislocations slip confined by neighboring twin boundaries. However, most of the previous studies are focused on the homogenous plastic deformation under tension and compression tests, the non-homogenous deformation and its deformation mechanism, especially under low strain and complex stress condition/confined condition, of nanotwinned metals are still not explored so far. In this study, the electrodeposited bulk Cu samples with preferentially oriented nanotwins were cold rolled with the normal of the rolling plane parallel to the growth direction (ND//GD) to strain of 15% at room temperature. The microstructure features of as-rolled Cu were investigated by SEM and TEM. Microstructure evolution indicates that many detwinning bands appeared in the direction about 30 degrees similar to 45 degrees with respect to the rolling direction, which is the direction with the largest shearing stress. The twin lamellae in the detwinning bands coarsened obviously. Based on calculation of the local shear strain and strain gradient of TBs in a selected detwinning band, it indicates that the maximum shear strain occurs in the middle of the deformation bands, and its detwinning mechanism is directly related the localized shear strains (gamma). The twin lamellae in the detwinning bands were coarsened obviously. When 0.3
关键词	Cu nanoscale twin cold rolling detwinning shear strain
资助者	National Basic Research Program of China ; National Natural Science Foundation of China
收录类别	SCI
语种	英语
资助项目	National Basic Research Program of China[2012CB932202] ; National Natural Science Foundation of China[51420105001] ; National Natural Science Foundation of China[51371171] ; National Natural Science Foundation of China[51471172]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000374809600013
出版者	SCIENCE PRESS
引用统计	被引频次：4[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/321006/122068
专题	中国科学院金属研究所
通讯作者	Lu Lei
作者单位	Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Bai Jingsheng,Lu Qiuhong,Lu Lei. DETWINNING BEHAVIOR INDUCED BY LOCAL SHEAR STRAIN IN NANOTWINNED Cu[J]. ACTA METALLURGICA SINICA,2016,52(4):491-496.
APA	Bai Jingsheng,Lu Qiuhong,&Lu Lei.(2016).DETWINNING BEHAVIOR INDUCED BY LOCAL SHEAR STRAIN IN NANOTWINNED Cu.ACTA METALLURGICA SINICA,52(4),491-496.
MLA	Bai Jingsheng,et al."DETWINNING BEHAVIOR INDUCED BY LOCAL SHEAR STRAIN IN NANOTWINNED Cu".ACTA METALLURGICA SINICA 52.4(2016):491-496.