Abstract
The work purpose is a study of the effect of hot isostatic pressing (HIP) on the microstructure and phase composition of titanium aluminide based alloys using experimental and computational methods. Isothermal and polythermal sections of the Ti–Al–Nb–Mo system, liquidus, solidus, and other phase change temperatures are calculated by dint of Thermo-Calc program. General character of microstructure after vacuum annealing and HIP-processing at t = 1250 °C is shown to be about identical: γ + α2 eutectoid colonies and relatively compact particles of β and γ phases. However vacuum annealing, unlike HIP, does not result in elimination of casting porosity. The data of metallographic and X-ray microspectroscopic analyses confirm the computational results as a whole.
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