High-temperature deformation behaviour of Ti3Al-11Nb intermetallic

Abstract A mechanism of high-temperature plasticity has been studied in terms of stress exponent and activation energy for deformation. A Ti3Al-based intermetallic was processed by hot-rolling in the two-phase field to accomplish a fine-grained microstructure. Compression stress – strain tests were conducted in the temperature interval ranging from 900 to 1 050 °C and strain rates between 6.9 · 10− 5 and 2.7 · 10− 2 s− 1. Results indicate that viscous-drag dislocation glide and grain boundary sliding are the main mechanisms of deformation. Activation energy for deformation suggests dependency on the solute content in the -phase.