Hydrogen-induced softening in nanocrystalline Ni investigated by nanoindentation

Yakai ZhaoDivision of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea

Moo-Young SeokDivision of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea

Dong-Hyun LeeDivision of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea

Jung-A LeeDivision of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea

Jin-Yoo SuhHigh Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, Republic of KoreaCorrespondence[email protected]

Jae-il JangDivision of Materials Science and Engineering, Hanyang University, Seoul, Republic of KoreaCorrespondence[email protected]

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.

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Hydrogen-induced softening in nanocrystalline Ni investigated by nanoindentation

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Hydrogen-induced softening in nanocrystalline Ni investigated by nanoindentation

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