Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence

doi:10.1080/21663831.2018.1486337

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	Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence
	Wu, P 1; Ye, XL ; Liu, LZ ; Jin, HJ
刊名	MATERIALS RESEARCH LETTERS
	2018-01-23
卷号	6 期号:9 页码:508-514
关键词	Strength flow stress size-effect surface-effect nanoporous gold
ISSN号	2166-3831
DOI	10.1080/21663831.2018.1486337
英文摘要	Compression of nanoporous gold in situ under electrochemical control reveals that its flow stress can be enhanced by surface coverage of monolayer oxide. Here we present a study on the monolayer oxide induced changes in flow stress of an nanoporous gold, while the ligament size is varied by more than 2 orders of magnitude. The increase percentage of flow stress (of nanoporous gold and nano-ligaments) induced by surface monolayer oxide is negligible when the ligament size (L) exceeds similar to 2 mu m, increases with decreasing L for similar to 200nm < L < similar to 2 mu m, and then saturates at similar to 27% for L < similar to 200 nm. These results indicate a transition from bulk-like to surface-mediated deformation behavior of nano-ligaments as L decreases from similar to 2 mu m to similar to 200 nm. Our observation at L < similar to 200nm support the notion that the deformation is dominated by the surface-dislocationnucleation at this scale. [GRAPHICS] IMPACT STATEMENT This study shows that the surface-modification induced hardening in nanoporous Au doesn't increase monotonically with decreasing structure size as usually thought, providing new clues to the understandings of nano-crystal plasticity.
学科主题	Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000439589200005
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80241]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wu, P,Ye, XL,Liu, LZ,et al. Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence[J]. MATERIALS RESEARCH LETTERS,2018,6(9):508-514.
APA	Wu, P,Ye, XL,Liu, LZ,&Jin, HJ.(2018).Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence.MATERIALS RESEARCH LETTERS,6(9),508-514.
MLA	Wu, P,et al."Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence".MATERIALS RESEARCH LETTERS 6.9(2018):508-514.