Abstract
This research chose nano-scaled Al2O3 granular materials as the reinforcement particle and used the modified disintegrated melt deposition (DMD) technique to integrate the particle Al2O3 p with AZ91D as the magnesium metal matrix composites (Mg MMCs). Subsequently, the melt soup was formed with rapid stirring, and the different heat treatment processes were used to improve the mechanical properties of the composites. With increase of the weight percentage of the particles added into AZ91D, the hardness was increased. But the hardness of the composite added with the particle is declined moderately under the process of air cooling and water cooling. With room temperature cooling condition, the ultimate tensile strength (UTS) of present Al2O3 p/AZ91D MMCs is 189.55 MPa. With the water cooling condition, UTS of present MMCs increases to 191.86 MPa. However, with the air cooling condition, UTS of present MMCs increases up to 271.86 MPa. After T6 heat treatment, the hardness of 1wt.% Al2O3 p added MMCs is improved to 78.94 HV due to the aging effect and its UTS is 254.63 MPa under the condition of the 32hr aging treatment.