Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
796093 | Journal of Materials Processing Technology | 2009 | 8 Pages |
The flow behaviors of PM titanium aluminide alloy were studied by isothermal compression simulation test. The apparent activation energy of deformation was calculated to be 313.53 kJ mol−1 and a constitutive equation had been established to describe the flow behavior. Processing map was developed at a strain of 0.7. With an increase of strain, two domains can be found: dynamic recrystallization and superplastic deformation, which are further confirmed by microstructural observations. The dynamic recrystallization occurs extensively at 1000 °C and 10−3 s−1, with a peak efficiency of 50%, and the superplastic deformation occurs at 1100 °C and 10−3 s−1, with a peak efficiency of 60%. At a strain rate higher than 10−1 s−1, the alloy exhibits flow instability.