• Precipitation hardening and hydrogen embrittlement of aluminum alloy AA7020

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    • Keywords

       

      Hydrogen embrittlement; AA7020 Al–Mg–Zn alloy; duplex ageing; delayed failure.

    • 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.

    • Author Affiliations

       

      Santosh Kumar1 T K G Namboodhiri2

      1. Neelachal Ispat Nigam Limited, Bhubaneswar 751 022, India
      2. Department of Metallurgical Engineering, Banaras Hindu University, Varanasi 221 005, India
    • Dates

       
  • Bulletin of Materials Science | News

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