Hydrogen-enhanced interfacial damage in Ni-based single crystal superalloy

J Xiong and YX Zhu and ZH Li and MS Huang, SCRIPTA MATERIALIA, 143, 30-34 (2018).

DOI: 10.1016/j.scriptamat.2017.07.023

The effect of hydrogen (H) on the interfacial damage in Ni-based single crystal superalloy is investigated by utilizing the molecular dynamics (MD) method. Accompanying the motion of misfit dislocation networks on the gamma/gamma(') interphase, more vacancies can form on the gamma/gamma(') interface with higher pre-charged H concentration. With the same H concentration, hydrogen-enhanced vacancies can more easily form at a low temperature than a high temperature. Meanwhile, hydrogen can facilitate the reaction and dissociation of interfacial dislocation segments, aggravating subsequent damage of the interfacial dislocation networks. These results shall enrich our understanding on the hydrogen embrittlement of the Ni-based single crystal superalloy. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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