Hydrogen-induced softening in nanocrystalline Ni investigated by nanoindentation. Issue 32 (1st December 2016)

• Record Type: Journal Article
• Authors: Zhao, Yakai; Seok, Moo-Young; Lee, Dong-Hyun; Lee, Jung-A; Suh, Jin-Yoo; Jang, Jae-il
• Is Part Of: Philosophical magazine. Volume 96:Issue 32/34(2016)
• Page Start: 3442
• Page End: 3450
• Publication Date: 2016-12-01
• Subjects: Nanocrystals -- nanoindentation -- hydrogen; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2016.1159743
• Languages: English
• ISSNs: 1478-6435

Abstract

Abstract: The influence of hydrogen on the plastic deformation of nanocrystalline nickel was analysed by recourse to nanoindentation on the uncharged and hydrogen-charged samples. It was revealed that, in nanocrystalline Ni, hydrogen significantly decreases hardness but does not alter the strain rate sensitivity. Through thermal desorption spectroscopy measurement, charged hydrogen was expected to reside in face-centred cubic lattice, grain boundaries (GBs) and vacancies rather than dislocations. The hydrogen-induced softening behaviour is discussed in terms of the possible roles of hydrogen in GB-assisted dislocation flow mechanism.