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Aluminum-lithium powder metallurgy alloys with improved toughness

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Abstract

A technique has been developed for increasing the toughness of Al-Li products made by powder metallurgy. The technique which involves forming a duplex structure by the addition of unalloyed aluminum powder to Al-Li powder before compaction was evaluated with Al-Li-Cu-Mg-Zr alloys (A18090). The strength, ductility, toughness, and short transverse stress corrosion resistance of the alloys were determined. The addition of 15 pct aluminum to A18090 aged at 422 K for 40 hours produced an increase in impact toughness of 215 pct at the expense of a drop in yield strength of 11 pct. The powder metallurgy alloys with a duplex structure had superior longitudinal strengthtoughness combinations to ingot materials of similar composition processed identically.

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Authors and Affiliations

  1. Advanced Material Development, 20565 Verde Vista Lane, 95070, Saratoga, CA

    D. Webster (Consultant)

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  1. D. Webster
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Formerly with Kaiser Aluminum & Chemical Corporation, P.O. Box 877, Pleasanton, CA 94566

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Webster, D. Aluminum-lithium powder metallurgy alloys with improved toughness. Metall Trans A 19, 603–615 (1988). https://doi.org/10.1007/BF02649274

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  • DOI: https://doi.org/10.1007/BF02649274

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