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    Hydrogen induced slowdown of spallation in high entropy alloy under shock loading

    Access Status
    Fulltext not available
    Authors
    Xie, Z.C.
    Li, C.
    Wang, H.Y.
    Lu, Chunsheng
    Dai, L.H.
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Xie, Z.C. and Li, C. and Wang, H.Y. and Lu, C. and Dai, L.H. 2021. Hydrogen induced slowdown of spallation in high entropy alloy under shock loading. International Journal of Plasticity. 139: Article No. 102944.
    Source Title
    International Journal of Plasticity
    DOI
    10.1016/j.ijplas.2021.102944
    ISSN
    0749-6419
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/83416
    Collection
    • Curtin Research Publications
    Abstract

    Hydrogen embrittlement is ubiquitous in metals and alloys exposed to hydrogen, which has been extensively studied over a century. In contrast to traditional alloys, mechanisms of hydrogen embrittlement under shock loading are poorly understood, especially in recently emerging multi-principle element and chemically disordered high entropy alloys (HEAs). By using a specially designed double-target technique, an unexpected phenomenon of hydrogen-retarded spallation was observed in CrMnFeCoNi HEA under plate impact loading. To reveal the underlying mechanism, a trans-scale statistical damage mechanics model was developed based on microstructural characterization and first principles calculations. The hydrogen-retarded nucleation of micro-voids is attributed to hydrogen-vacancy complexes with high migration energy, while formation of nano-twins with high resistance reduces their growth rate. These results shed light on the better understanding of hydrogen embrittlement in chemically complex HEAs.

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