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Kinetics of Ti3Al grain boundary precipitation in Ti-Al binary and Ti-Al-X ternary alloys and correlation with mechanical properties

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Abstract

Grain boundary precipitation of Ti3Al was found to proceed rapidly in Ti-Al, Ti-Al-O, and Ti-Al-Sn alloys. Additions of Zr, Cb(Nb), Mo, and V retarded the precipitation reaction and appeared to inhibit or suppress it at grain boundaries. The nose of the TTT curves for the precipitation reaction occurred at about 650°C. Although the precipitation reaction apparently starts at grain boundaries in less than 1 hr at the nose, the reaction is very sluggish within grains and was not completed in 129 hr at the temperature of the nose. Toughness is degraded and recovers in 500 hr at 650°C. The ternary additions, except tin, slow the degradation of toughness in apparent concert with their retardation of the kinetics of the Ti3Al precipitation reaction.

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Authors and Affiliations

  1. Materials Sciences Laboratory, Lockheed Missiles & Space Co., Palo Alto, Calif.

    F. A. Crossley (Staff Scientist)

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  1. F. A. Crossley
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Formerly with IIT Research Institute, Chicago, Ill.

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Crossley, F.A. Kinetics of Ti3Al grain boundary precipitation in Ti-Al binary and Ti-Al-X ternary alloys and correlation with mechanical properties. Metall Trans 1, 1921–1929 (1970). https://doi.org/10.1007/BF02642792

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