Deformation characteristics of Ti–6Al–4Fe alloys with enhanced high temperature ductility

Deformation behavior of Ti–6Al–4Fe alloys with high strength and formability was investigated by conducting high temperature tensile test. In tensile test at room temperature, the strength of Ti–6Al–4Fe alloys was higher than that of a commercial Ti–6Al–4V alloy with a similar level of elongation. In particular, the high temperature (700 °C) elongation was dramatically increased in Ti–6Al–4Fe alloys showing ∼800% superplasticity. Grain boundary sliding and suppression of cavity formation (i.e., easier accommodation) during gb sliding due to beta phase were found to be possible mechanisms for the superplasticity of Ti–6Al–4Fe alloys.