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A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys
Chen, Xiang; Han, Zhong
2020-11-28
Source PublicationFRICTION
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.
DOI10.1007/s40544-020-0440-x
WOS IDWOS:000592557600001
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82339
Collection中国科学院金属研究所
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.
APA Chen, Xiang,&Han, Zhong.(2020).A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys.FRICTION.
MLA Chen, Xiang,et al."A low-to-high friction transition in gradient nano-grained Cu and Cu-Ag alloys".FRICTION (2020).
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