Deformation Behavior of Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo-0.35Si-0.85Nd Alloy inβ/Quasi-βForging Process

摘要

The hot deformation behavior of Ti-5.6Al-4.8Sn-2.0Zr-1.0Mo-0.35Si-0.85Nd alloy inβ/quasi-βforging process was studied using isothermal compression tests over temperature range from 1 040 ℃ to 1 100 ℃ and strain rates form 0.001 s-1 to 70 s-1 .The results show that the flow stress and microstructure are sensitive to thermome-chanical parameters.The processing maps based on the dynamic materials model at strain of 0.3 and 0.7 were estab-lished.The optimum deformation thermomechanical parameters at a strain of 0.7 have two regions that exhibit the peak of power dissipation efficiency.One is the region of 1 062-1 100 ℃ and 10-3-10-1.5 s-1;and another which re-presents dynamic recrystallization is 1 040-1 045 ℃ and 10-1.8-10-0.9 s-1 .The instable region is located where the strain rate is larger than 1 s-1 which corresponds to the mechanical instability.