Microstructure Evolution of AZ91D Alloy in Casting and Forging Compound Forming Process
Taking AZ91D cast magnesium alloy as research object,the evolution of microstructure of the alloy before and after isothermal die forging was analyzed,and the average grain length of the primary phase was quantitatively measured by using particle size analysis software.The results show that: after isothermal forging,the matrix phase and second phase are elongated along the direction of the vertical pressure,gradually evolve into fibrous shape,and show characteristics of a significant flow line.Meanwhile,the average grain length of the primary phase increases by about 80%,and the largest crystal grain length increases by about 90.3%.