A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys

doi:10.1007/s40544-020-0440-x

IMR OpenIR

	A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys
	Chen, Xiang 1,2; Han, Zhong 1
通讯作者	Han, Zhong(zhonghan@imr.ac.cn)
	2020-11-25
发表期刊	FRICTION
ISSN	2223-7690
页码	10
摘要	A 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.
关键词	gradient nano-grained metals Cu and Cu-Ag alloy low-to-high friction transition subsurface plastic deformation wear
资助者	National Key R&D Program of China ; Key Research Program of Chinese Academy of Sciences ; Liaoning Revitalization Talents Program
DOI	10.1007/s40544-020-0440-x
收录类别	SCI
语种	英语
资助项目	National 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研究方向	Engineering
WOS类目	Engineering, Mechanical
WOS记录号	WOS:000592557600001
出版者	SPRINGER
引用统计	被引频次：19[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/321006/141514
专题	中国科学院金属研究所
通讯作者	Han, Zhong
作者单位	1.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
推荐引用方式 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.