Abstract: The deformation temperature and the strain rate have great effect on the true strain-stress curves and microstructures of Ti-45Al-8.0Nb-0.2W-0.2B-0.1Y(atomicpercent)through the analyses of hot compression. Curves expresse strain-soften with the strain increasing at low deformation temperature and high strain rate, and the microstructures of TiAl alloys show much streamline shape. As the deformation temperature reaches 1250℃ and the strain rate reduces to 1×10^-3s^-1, the microstructures become homogenous because of full recrystallization.

Key words: TiAl alloy containing high Nb, microstructure, hot deformation