Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper

IMR OpenIR

	Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper
	Lu, N.; Du, K.; Lu, L.; Ye, H. Q.; kuidu@imr.ac.cn
	2015
发表期刊	NATURE COMMUNICATIONS
ISSN	2041-1723
卷号	6 页码:-
摘要	Metals with a high density of nanometre-scale twins have demonstrated simultaneous high strength and good ductility, attributed to the interaction between lattice dislocations and twin boundaries. Maximum strength was observed at a critical twin lamella spacing (similar to 15 nm) by mechanical testing; hence, an explanation of how twin lamella spacing influences dislocation behaviours is desired. Here, we report a transition of dislocation nucleation from steps on the twin boundaries to twin boundary/grain boundary junctions at a critical twin lamella spacing (12-37 nm), observed with in situ transmission electron microscopy. The local stress concentrations vary significantly with twin lamella spacing, thus resulting in a critical twin lamella spacing (similar to 18 nm) for the transition of dislocation nucleation. This agrees quantitatively with the mechanical test. These results demonstrate that by quantitatively analysing local stress concentrations, a direct relationship can be resolved between the microscopic dislocation activities and macroscopic mechanical properties of nanotwinned metals.
部门归属	[lu, n. ; du, k. ; lu, l. ; ye, h. q.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
资助者	National Natural Science Foundation of China [51221264, 51390473, 51420105001, 51371171]; Special Funds for the Major State Basic Research Projects of China [2012CB619503]; National Basic Research Program of China [2012CB932202]
收录类别	sci
语种	英语
WOS记录号	WOS:000358857800022
引用统计	被引频次：141[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/321006/75222
专题	中国科学院金属研究所
通讯作者	kuidu@imr.ac.cn
推荐引用方式 GB/T 7714	Lu, N.,Du, K.,Lu, L.,et al. Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper[J]. NATURE COMMUNICATIONS,2015,6:-.
APA	Lu, N.,Du, K.,Lu, L.,Ye, H. Q.,&kuidu@imr.ac.cn.(2015).Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper.NATURE COMMUNICATIONS,6,-.
MLA	Lu, N.,et al."Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper".NATURE COMMUNICATIONS 6(2015):-.