Stress-dependent grain size evolution of nanocrystalline Ni-W and its impact on friction behavior. (October 2016)

• Record Type: Journal Article
• Authors: Argibay, N.; Furnish, T.A.; Boyce, B.L.; Clark, B.G.; Chandross, M.
• Is Part Of: Scripta materialia. Volume 123(2016)
• Page Start: 26
• Page End: 29
• Publication Date: 2016-10
• Subjects: Nanocrystalline metal -- Wear -- Friction -- Plastic deformation -- Microstructural evolution; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.05.009
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The friction behavior of ultra-nanocrystalline Ni-W coatings was investigated. A critical stress threshold was identified below which friction remained low, and above which a time-dependent evolution toward higher friction behavior occurred. Founded on established plasticity models we propose a correlation between surface grain size and applied stress that can be used to predict the critical stress separating the two friction regimes. This interpretation of plasticity models suggests that macro-scale low and high friction regimes are respectively associated with the nano-scale mechanisms of grain boundary and dislocation-mediated plasticity. Graphical abstract: