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Rapidly solidified P/M X2020 aluminum alloys

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Abstract

X2020 aluminum alloys were produced with variations in the Li/Cu ratio by the ultrasonic gas atomization process. In alloy 68 (Al-4.9Cu-l.2Li) and 69 (Al-4.4Cu-l.55Li) alloys, the Θ′ and T1, phases are dominant with evidence of the TB phase. In the 70 (Al-3.5Cu-2.8Li) alloy, the δ′ phase is dominant with a trace of T1. It was found that Θ′ andT 1 are effective strengtheners whereas δ′ provides excellent fatigue crack initiation resistance. Overall results indicate that the fracture behavior of three RS-PM X2020 alloys is closely related to alloy production route as well as to the phases present in the alloys.

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Authors and Affiliations

  1. GTE Laboratories Incorporated, 02254, Waltham, MA

    Shinhoo Kang (Senior Member of Technical Staff)

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    Nicholas J. Grant (Professor)

Authors
  1. Shinhoo Kang
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  2. Nicholas J. Grant
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Formerly Research Assistant, Massachusetts Institute of Technology.

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Kang, S., Grant, N.J. Rapidly solidified P/M X2020 aluminum alloys. Metall Trans A 18, 2037–2046 (1987). https://doi.org/10.1007/BF02647076

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