Research on Temperature Sensitivity Exponent of Isothermally Compressed Ti-6Al-4V Alloy
The effects of deformation process parameters on the microstructure evolution and temperature sensitivity exponent of Ti-6Al-4V alloy were investigated.The isothermal compression of the alloy was conducted at deformation temperatures ranging from 1123-1213 K with an interval of 30 K,the strain rates of 0.01,0.05,0.1 and 10.0 s-1 and the height reduction of 30%,50%,70%.According to the experimental results of Ti-6Al-4V alloy,the grain size and volume fraction of primary α phase decrease with the increase of deformation temperature and strain rate.The temperature sensitivity exponent increases with the increase of deformation temperature and strain rate;when strain increases,the grain size and volume fraction of primary α phase does not obviously change,and the temperature sensitivity exponent reduces.