Analysis of high temperature deformation behavior of a high Nb containing TiAl based alloy

Abstract The effects of deformation temperature and strain rate on the hot deformation behaviors of as-cast Ti–45Al–8.5Nb–(W,B,Y) alloy were investigated. The results indicated that when deformation temperature is below 1250 °C, the flow stress decreases with the increase of deformation temperature and decrease of strain rate, once deformation temperature reaches 1250 °C, the flow stress is not sensitive to strain rate any more. A neural network model was established to predict the flow stress of this high Nb containing TiAl based alloy during hot deformation. The predicted flow stress curves are in good agreement with experimental results.