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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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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DOI: https://doi.org/10.1007/BF02647076