Significant strengthening of nanocrystalline Ni sub-micron pillar by cyclic loading in elastic regime. (November 2017)

• Record Type: Journal Article
• Authors: Lee, Jung-A; Lee, Dong-Hyun; Seok, Moo-Young; Choi, In-Chul; Han, Heung Nam; Tsui, Ting Y.; Ramamurty, Upadrasta; Jang, Jae-il
• Is Part Of: Scripta materialia. Number 140(2017)
• Page Start: 31
• Page End: 34
• Publication Date: 2017-11
• Subjects: Nanocrystalline metals -- Micro-compression test -- Cyclic loading; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.07.001
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The influence of cyclic load, with the maximum stress well within the elastic regime, on the strength of nanocrystalline (nc) nickel was investigated through quasi-static compression experiments on cyclic-loaded sub-μm-sized pillars, fabricated through electron beam lithography and electroplating. Results show that prior-cycling enhances both yield and flow strengths of nc Ni without significant loss in plasticity. Changes in strain-rate sensitivity and activation volume for deformation upon cycling were measured and utilized to discuss possible mechanisms responsible for the observed strengthening. Graphical abstract: