High temperature deformation behavior of near alpha Ti–5.6Al–4.8Sn–2.0Zr alloy

Abstract

Isothermal compression of Ti–5.6Al–4.8Sn–2.0Zr alloy was carried out on a Thermecmaster-Z simulator at deformation temperatures between 960 and 1060 °C, constant strain rate between 0.001 and 10.0 s −1, and a maximum height reduction of 70%. The high temperature deformation behavior of Ti–5.6Al–4.8Sn–2.0Zr was characterized based on an analysis of the stress–strain behavior, kinetics and processing map. The activation energy for deformation obtained during high temperature compression of Ti–5.6Al–4.8Sn–2.0Zr alloy are 221.7 kJ/mol in the β phase region and 1082.4 kJ/mol in the α + β phase region. The constitutive equation proposed to describe the flow stress as a function of strain rate, strain and deformation temperature during high temperature compression of Ti–5.6Al–4.8Sn–2.0Zr alloy enables a close agreement between the predicted and experimental stress–strain curves.