The Deformation Microstructure and Eutectic Melting Activation Energy of AZ91D Alloy

摘要

The effect of deformation degree on deformation microstructure in the preparation of semi-solid AZ91D alloybillet by Strain Induced Melt Activated (SIMA) process was studied and the relationship between deformation degree andeutectic melting activation energy was studied by Differential Scanning Calorimetry (DSC). The results showed that withan increase in deformation degree, the original microstructure of the alloy changed from dendrites to fragmentary grainswhere there were twins and dislocations. When the deformation degree was 40%, the decreased amount of eutectic meltingactivation energy was not significant. Melting point of eutectic decreased slightly with increasing deformation degree.