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Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence
Wu, Peng1,2; Ye, Xing-Long1; Liu, Ling-Zhi1; Jin, Hai-Jun1
Corresponding AuthorJin, Hai-Jun(hjjin@imr.ac.cn)
2018
Source PublicationMATERIALS RESEARCH LETTERS
ISSN2166-3831
Volume6Issue:9Pages:508-514
AbstractCompression 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.
KeywordStrength flow stress size-effect surface-effect nanoporous gold
Funding OrganizationNational Key R&D Program of China ; Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province
DOI10.1080/21663831.2018.1486337
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFA0204401] ; Natural Science Foundation of China[51571206] ; Natural Science Foundation of Liaoning Province[2014029103]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
WOS IDWOS:000439589200005
PublisherTAYLOR & FRANCIS INC
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/135876
Collection中国科学院金属研究所
Corresponding AuthorJin, Hai-Jun
Affiliation1.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
Recommended Citation
GB/T 7714
Wu, Peng,Ye, Xing-Long,Liu, Ling-Zhi,et al. Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence[J]. MATERIALS RESEARCH LETTERS,2018,6(9):508-514.
APA Wu, Peng,Ye, Xing-Long,Liu, Ling-Zhi,&Jin, Hai-Jun.(2018).Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence.MATERIALS RESEARCH LETTERS,6(9),508-514.
MLA Wu, Peng,et al."Monolayer oxide enhanced flow stress in nanoporous gold: the size dependence".MATERIALS RESEARCH LETTERS 6.9(2018):508-514.
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