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    Hydrogen-enhanced cracking revealed by in situ micro-cantilever bending test inside environmental scanning electron microscope

    Access Status
    Fulltext not available
    Authors
    Deng, Y.
    Hajilou, T.
    Barnoush, Afrooz
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Deng, Y. and Hajilou, T. and Barnoush, A. 2017. Hydrogen-enhanced cracking revealed by in situ micro-cantilever bending test inside environmental scanning electron microscope. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 375 (2098).
    Source Title
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
    DOI
    10.1098/rsta.2017.0106
    ISSN
    1364-503X
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/71305
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Author(s) Published by the Royal Society. All rights reserved. To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an environmental scanning electron microscope (ESEM), which provides both a full process monitoring and a clean, in situ H-charging condition. Two sets of cantilevers were analysed in this work: one set of un-notched cantilevers, and the other set with focused ion beam-milled notch laying on two crystallographic planes: (010) and (110). The cantilevers were tested under two environmental conditions: vacuum (approximately 5×10-4 Pa) and ESEM (450 Pa water vapour). Crack initiation at stressconcentrated locations and propagation to cause catastrophic failure were observed when cantilevers were tested in the presence of H; while no cracking occurred when tested in vacuum. Both the bending strength for un-notched beams and the fracture toughness for notched beams were reduced under H exposure. The hydrogen embrittlement (HE) susceptibility was found to be orientation dependent: The (010) crystallographic plane was more fragile to HE than the (110) plane.

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