An experimental and theoretical investigation of the effect of second-phase particles on grain growth during the annealing of hot-rolled AZ61 magnesium alloy

The mechanical properties of a magnesium alloy strongly depend on its grain structure. It is desirable to minimize growth during the post-forming annealing treatment, thereby minimizing loss in strength while regaining ductility. In present research, hot-rolled AZ61 Mg at different temperatures for times was performed reveal kinetics growth, as affected by precipitation or dissolution second-phase particles. Three approaches, i.e., experimental, analytical modeling and atomistic simulation were taken results compared. predictions made from model Monte Carlo both acceptable agreement with experimental terms resultant sizes. However, showed advantages over model. found that increasing temperature holding time, fraction particles reduced, which limiting size homogeneity. average sizes largest characteristic parameters as-annealed microstructure. pointed out importance choosing an appropriate combination time order retain not only preventing unrestricted but also avoiding inhomogeneity.