Abstract
The microstructure, compression and creep behaviour of γ-TiAl based alloys containing 46.5 at.% Al with varying amounts of beta stabilizing elements Nb, Cr and Mo have been investigated in the present work. Compression tests were carried out at room temperature as well as high temperature (800 °C), and creep tests were carried out at 800 °C and at a stress of 300 MPa. Compression and creep studies were conducted in a standard microstructural condition after a solutionizing and ageing treatment and fracture surfaces and deformation microstructures were analysed after creep. The effect of beta stabilizing elements on compression and creep were assessed in terms of beta phase formation, different phase constituents and solid solution strengthening mechanisms. Creep studies were also carried out at 750, 800 and 850 °C and stresses of 250, 300 and 350 MPa to evaluate the creep deformation mechanisms in these alloys and are presented in the current work.
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