Abstract
Near-{gamma} titanium aluminide (TiAl) alloys have potential as lightweight high temperature structural materials for the automotive and aerospace industries. This can be attributed to the material`s low density, good oxidation, resistance, high elastic modulus, and good elevated-temperature strength retention. However, the microstructural evolution of near-{gamma} TiAl alloys during extended heat treatment periods has not been studied in detail and therefore, a comprehensive understanding of these microstructures is not available. This paper focuses on the microstructural response of three powder metallurgy (P/M) near-{gamma} TiAl alloys to long-time heat treatments at temperatures near the {alpha}transus temperature (T{sub {alpha}}). Relevant microstructural features are characterized and T{sub {alpha}} for each alloy is determined.
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