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A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys
Chen, Xiang1,2; Han, Zhong1
Corresponding AuthorHan, Zhong(zhonghan@imr.ac.cn)
2020-11-25
Source PublicationFRICTION
ISSN2223-7690
Pages10
AbstractA unique low-to-high friction transition is observed during unlubricated sliding in metals with a gradient nano-grained (GNG) surface layer. After persisting in the low-friction state (0.2-0.4) for tens of thousands of cycles, the coefficients of friction in the GNG copper (Cu) and copper-silver (Cu-5Ag) alloy start to increase, eventually reaching a high level (0.6-0.8). By monitoring the worn surface morphology evolution, wear-induced damage accumulation, and worn subsurface structure evolution during sliding, we found that the low-to-high friction transition is strongly correlated with distinct microstructural instabilities induced by vertical plastic deformation and wear-off of the stable nanograins in the subsurface layer. A very low wear loss of the GNG samples was achieved compared with the coarse-grained sample, especially during the low friction stage. Our results suggest that it is possible to postpone the initiation of low-to-high friction transitions and enhance the wear resistance in GNG metals by increasing the GNG structural stability against grain coarsening under high loading.
Keywordgradient nano-grained metals Cu and Cu-Ag alloy low-to-high friction transition subsurface plastic deformation wear
Funding OrganizationNational Key R&D Program of China ; Key Research Program of Chinese Academy of Sciences ; Liaoning Revitalization Talents Program
DOI10.1007/s40544-020-0440-x
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFA0204401] ; National Key R&D Program of China[2017YFA0204403] ; Key Research Program of Chinese Academy of Sciences[KGZD-EW-T06] ; Liaoning Revitalization Talents Program[XLYC1808008]
WOS Research AreaEngineering
WOS SubjectEngineering, Mechanical
WOS IDWOS:000592557600001
PublisherSPRINGER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/141514
Collection中国科学院金属研究所
Corresponding AuthorHan, Zhong
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nano & Heterogeneous Mat Ctr, Nanjing 210094, Peoples R China
Recommended Citation
GB/T 7714
Chen, Xiang,Han, Zhong. A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys[J]. FRICTION,2020:10.
APA Chen, Xiang,&Han, Zhong.(2020).A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys.FRICTION,10.
MLA Chen, Xiang,et al."A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys".FRICTION (2020):10.
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