Abstract

The microstructure and creep behaviour of as-cast beta phase contained gamma titanium aluminide with nominal composition of Ti-48Al-4Cr (at.%) was investigated. Constant load tensile creep test were performed at temperatures between 600-8000C and initial stresses from 150-180MPa. Data indicates that the alloy exhibit both steady state and minimum creep behaviour depending upon the temperature and stress. Microstructure before and after creep deformation were examined using scanning electron microscopy techniques. The possible reason for the transition from steady state to minimum creep behaviour was suggested.

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