Quantitative evaluation of the lamellar kinking&rotation on the flow softening of γ-TiAl-based alloys at elevated temperatures

Abstract The flow curves of lamellar TiAl alloys generally exhibit pronounced flow softening at elevated temperatures, which has been thought to be caused by recrystallization/globularization. However, in this work we quantitatively determined that the lamellar kinking&rotation is the major softening mechanism especially at the initial deformation stage. By using electron microscopy, the kinking&rotation mechanism as well as the resulted softening mechanism were analyzed and discussed.