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Influence of Quenching Rates on the Transformation of Ternary Phases in Nb-rich γ-TiAl Alloys

Intermetallic γ-TiAl based alloys are a class of novel, light-weight structural materials with attractive mechanical properties for advanced high-temperature applications. Conventional titanium aluminides are two-phase alloys consisting of tetragonal γ-TiAl (L10 structure; P 4/m m m) and small amounts of hexagonal α2-Ti3Al (D019 structure; P 63/m m c). Due to their low density (4 g/cm), their high yield and creep strength up to 800 °C and their good oxidation resistance they have the potential to replace the heavier Ni based superalloys (8 g/cm) in industrial and in aviation gas turbines as well as in automobile engines [1]. However, their low formability impedes their broad industrial application up to now.