Assessment and modelling of isothermal forging of intermetallic compounds Part 2 – Ti₃ Al

Abstract

In this, the second of four papers devoted to the isothermal forging of intermetallic compounds, the Ti₃ Al based alloy Superalpha-2 has been deformed in compression at constant strain rate, over temperature and strain rate ranges of 900–1050°C and 0·0003–0·035 s^-1, respectively. Calculation of the material property parameters suggests that this material deforms via dynamic recrystallisation of the B2 phase. Microstructural examination has shown that isothermal forging generates non-equilibrium microstructures. Deformation modelling has been successful in predicting the forging behaviour. Finally, the possibility of explosive grain growth immediately after forging raises questions as to whether the mechanical properties of this material can usefully be controlled by isothermal forging.