Published 06/03/2021 at 756 × 290 in A forced convection stirring process for Rheo-HPDC aluminum and magnesium alloys Fig. 16. SEM images of FCS Rheo-HPDC parts of AZ91D alloy after T4 heat treatment (a) and T6 heat treatment (b). Fig. 16. SEM images of FCS Rheo-HPDC parts of AZ91D alloy after T4 heat treatment (a) and T6 heat treatment (b).