Hydrogen embrittlement of an Al–Zn–Mg–Cu series alloy with high Zn-content in humid air

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  • Manaka Toshiaki
    Department of Environmental Materials Engineering, National Institute of Technology, Niihama College
  • Todai Mitsuharu
    Department of Environmental Materials Engineering, National Institute of Technology, Niihama College
  • Wada Mizuki
    Regular Course Student, Department of Environmental Materials Engineering, National Institute of Technology, Niihama College

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Other Title
  • 高Zn濃度Al–Zn–Mg–Cu系合金の湿潤空気中での水素脆化特性
  • コウZn ノウド Al-Zn-Mg-Cuケイ ゴウキン ノ シツジュン クウキ チュウ デ ノ スイソゼイカ トクセイ

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<p>Hydrogen embrittlement sensitivity of a high-Zn containing Al–Zn–Mg–Cu series alloy in T6 temper was evaluated by tensile testing at various strain rates in humid air (HA) and dry nitrogen gas (DNG). The elongation of Al–10Zn–2.6Mg–1.6Cu–0.2Cr alloy in HA was smaller than that in DNG due to hydrogen embrittlement. Quasi-cleavage fracture caused a loss of elongation at medium strain rates (10−3–10−4 s−1), and smooth intergranular cracking degraded ductility largely at slow strain rates (10−5–10−6 s−1). These results indicate that the higher content of Zn in Al–Zn–Mg–Cu series alloy increase hydrogen embrittlement sensitivity, and exhibits hydrogen embrittlement even when the strain rate is 10−3 s−1.</p>

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