Initial microstructure influence on Ti–Al–Mo–V alloy's superplastic deformation behavior and deformation mechanisms

Superplastic forming is an effective way to manufacture complex-shaped parts of titanium-based alloys. This paper studies the influence initial microstructure and its strain-induced evolution on superplastic deformation behavior formability a alloy. Two types Ti–Al–V–Mo alloy samples having different fraction recrystallized grains before start were studied. The behavior, including strain hardening rate sensitivity flow stress, was analyzed in temperature range 775 °C–900 °C 10−5 10−2 s−1. Strain-induced changes within bulk surface pre-polished studied during with constant rate. dynamic recrystallization grain growth volume multiple slip bands samples' revealed after deformation. structure localization depended samples’ microstructure. results showed that increased exhibited better superplasticity higher quality formed more uniform thickness distribution across section than lower fraction.