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Precipitation hardening and hydrogen embrittlement of aluminum alloy AA7020

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Abstract.

AA7020 Al–Mg–Zn, a medium strength aluminium alloy, is used in welded structures in military and aerospace applications. As it may be subjected to extremes of environmental exposures, including high pressure liquid hydrogen, it could suffer hydrogen embrittlement. Hydrogen susceptibility of alloy AA7020 was evaluated by slow strain-rate tensile testing, and delayed failure testing of hydrogen-charged specimens of air-cooled, duplexaged, and water-quenched duplex agedmaterials. The resistance to hydrogen embrittlement of the alloy was found to be in the order of air-cooled duplex aged alloy > as-received (T6 condition) > water quenched duplex aged material.

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Authors and Affiliations

  1. Neelachal Ispat Nigam Limited, Bhubaneswar, 751 022, India

    SANTOSH KUMAR

  2. Department of Metallurgical Engineering, Banaras Hindu University, Varanasi, 221 005, India

    T K G NAMBOODHIRI

Authors
  1. SANTOSH KUMAR
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  2. T K G NAMBOODHIRI
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Correspondence to SANTOSH KUMAR.

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KUMAR, S., NAMBOODHIRI, T.K.G. Precipitation hardening and hydrogen embrittlement of aluminum alloy AA7020. Bull Mater Sci 34, 311–321 (2011). https://doi.org/10.1007/s12034-011-0066-8

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  • DOI: https://doi.org/10.1007/s12034-011-0066-8

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