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Mechanical properties and microstructure of Al-Li-Cu-Mg-Zr die forgings

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Abstract

Four forgings of Al 8090 alloy were evaluated for strength, toughness, and stress corrosion resistance. A microstructural evaluation was also conducted. The forgings easily met the strength requirements for Al 7075-T73 but only just met the 7 pct minimum elongation requirement. The stress corrosion threshold was less than 35 MPa in the short transverse orientation, a value that is far below the 310 MPa minimum often required for Al 7075-T73. Fracture in areas which received low forging reductions was intergranular, while fracture in more heavily forged areas was also along subgrain boundaries. Possible mechanisms for the low toughness and stress corrosion resistance of Al-Li alloys are discussed.

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Authors and Affiliations

  1. Chemical Corporation, 20565 Verde Vista Lane, 95070, Saratoga, CA

    Donald Webster (Metallurgical Consultant)

  2. Boeing Company, 91203, Glendale, CA

    Richard Kirkbride (Quality Control Representative)

Authors
  1. Donald Webster
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  2. Richard Kirkbride
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Formerly Senior Staff Research Engineer, Kaiser luminum & Chemical Corporation, Pleasanton, CA 94566,

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Webster, D., Kirkbride, R. Mechanical properties and microstructure of Al-Li-Cu-Mg-Zr die forgings. Metall Trans A 17, 2007–2016 (1986). https://doi.org/10.1007/BF02644998

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