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Abstract
Unstable flow during hot deformation of an α2 titanium aluminide alloy Ti-24Al-20Nb alloy was analysed using two criteria, one of which was developed by Jonas and the other by Kalyankumar. Workability maps were constructed using the α parameter as suggested by Semiatin and Lahoti and instability maps were constructed based on the stability parameter ξ(ε) as suggested by Kalyankumar. Microstructural study was carried out on deformed specimens to validate the two criteria. The results of the two criteria were compared. The particular case of highly negative α values has been discussed in detail and it is shown that these correspond to regions of unstable flow.