Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading

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	Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading
	Zhou, Xin; Li, Xiuyan; Lu, K.
	2019-03-28
Source Publication	PHYSICAL REVIEW LETTERS
ISSN	0031-9007
Volume	122 Issue:12
Abstract	The greatly increased grain boundary (GB) mobility in nanograined metals under mechanical loading is distinguished from that in their coarse-grained counterparts. The feature leads to softening of nanograined materials and deviation of strength from the classical Hall-Petch relationship. In this Letter, grain size dependences of GB migration in nanograined Ag, Cu, and Ni under tension were investigated quantitatively in a wide size range. As grain size decreases from submicron, GB migration intensifies and then diminishes below a critical grain size. The GB migration peaks at about 80, 75, and 38 nm in Ag, Cu, and Ni, respectively. The suppression of GB migration below a critical size can be attributed to GB relaxation during sample processing or by postthermal annealing. With relaxed GBs the governing deformation mechanism of nanograins shifts from GB migration to formation of through-grain twins or stacking faults. GB relaxation, analogous to GB segregation, offers a novel approach to stabilizing nanograined materials under mechanical loading.
Indexed By	SCI
Language	英语
WOS ID	WOS:000462936100007
Publisher	AMER PHYSICAL SOC
Citation statistics	Cited Times:2[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.imr.ac.cn/handle/321006/81264
Collection	中国科学院金属研究所
Recommended Citation GB/T 7714	Zhou, Xin,Li, Xiuyan,Lu, K.. Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading[J]. PHYSICAL REVIEW LETTERS,2019,122(12).
APA	Zhou, Xin,Li, Xiuyan,&Lu, K..(2019).Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading.PHYSICAL REVIEW LETTERS,122(12).
MLA	Zhou, Xin,et al."Size Dependence of Grain Boundary Migration in Metals under Mechanical Loading".PHYSICAL REVIEW LETTERS 122.12(2019).

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