| Thixoforming process is a novel forming process that has some advantages compared to die casting. In this study, thixoforming process was selected for net shape of magnesium composites. This present work was mainly concerned with the formability and the mechanical properties of thixoformed silicon carbide particulate reinforced AZ91HP magnesium composites, which were manufactured by Rotation-Cylinder Method. The fulfilling behaviors of the composite slurries with thixotropic microstructures showed that the complete fulfilling was achieved over 0.5 effective liquid fraction regardless of the fraction of the reinforcement. Moreover it was observed that all slugs filled the die cavity with essentially laminar flow, unique flow behavior of thixoforming, even in incomplete mold filling at lower temperature. The results of mechanical properties of the composites showed significant improvement in YS and a slight increase in UTS had been achieved in the composite with 5 ㎛ SiC particulate, and wear properties of them were dependent on the size of particulate compared to the fraction of reinforcement. |
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