A set of models for microstructure evolution of titanium alloy during high temperature deformation

Microstructure evolution and modeling have been paid more attention in materials processing, in which it is a key to obtain the multi-scale microstructure models based on the physical metallurgy. In this paper, the two-scale microstructure model, including dislocation density and grain size of a primary phase in the high temperature deformation of titanium alloys, has been established. A set of models for microstructure evolution during high temperature deformation of the TC6 titanium alloy has been derived, in which 8 material constants have been optimized with the help of the genetic algorithm (GA) technique based on the experimental results of the TC6 titanium alloy. The maximum difference between the calculated and the experimental grain sizes of a primary phase of the TC6 titanium alloy is not more than 15.3%.