The ultra-small strongest grain size in nanocrystalline Ni nanowires. (1st January 2015)

• Record Type: Journal Article
• Authors: Cao, Ronggen; Deng, Chuang
• Is Part Of: Scripta materialia. Volume 94(2015)
• Page Start: 9
• Page End: 12
• Publication Date: 2015-01-01
• Subjects: Nanocrystalline -- Nanowire -- Grain size -- Plasticity; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.09.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Here we report the finding that the strongest grain size to achieve the maximum flow stress in nanocrystalline Ni nanowires was significantly smaller (d = 5 nm) than that in typical bulk metals (d > 10 nm). The discrepancy was due to the dominance of plasticity via surface slip in Ni nanowires at relatively large grain sizes, which was absent in bulk materials. An interesting grain size- and temperature-dependent "hardening"-to-"softening" transition in Ni nanowires was also revealed in this study.