Abstract
To effectively improve the hot deformation capability of TiAl-based alloys, Ti-44Al-6Nb-2Fe model alloy was prepared. Thermo-compressive experimental tests were performed, constitutive equations were established, hot processing maps were drawn, microstructure and instability mechanism were investigated to study the effect of Fe alloying. For comparison, Ti-44Al-8Nb alloy was also studied. The experiment showed that, the Ti-44Al-6Nb-2Fe alloy exhibited much lower peak stress, flow stress, stress exponent, and had better stress–strain coordination capability, more adequate dynamic recrystallization and much wider processing window. EBSD technique was also utilized to further demonstrate the better hot deformation capability of this model alloy. Moreover, the instability mode for the thermo-compressive two alloys was also investigated.
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