EFFECT OF TITANIUM CARBIDE ON WORKABILITY AND CORROSION BEHAVIOR OF MAGNESIUM-TIN METAL MATRIX COMPOSITES PREPARED BY POWDER METALLURGY ROUTE

摘要

Magnesium alloys had recently attracted much attention for applications that demand high strength and lightweight materials. Yet, strength at higher processing temperature of such alloys is very limited. On the other hand, magnesium matrix composite may be considered to have superior mechanical properties at higher temperatures. Powder metallurgy is an interesting composite fabrication route that produces near-net-shape products and reduces the corresponding forming and machining costs, while providing superior mechanical properties. Significant amount of research was carried out to investigate the effects of reinforcements on improving mechanical properties of magnesium matrix composites. However, there is only little information available about the effects of reinforcements on the workability of magnesium metal matrix composites. The aim of this work was to investigate the effects of the particle size and the amount of TiC on workability of Mg-Tin hybrid metal matrix composites using powder metallurgy route. In this work, the magnesium metal matrix composites were prepared through powder metallurgy route by mixing a fixed amount of Tin (4%) and varying amount of Titanium carbide (4%, 8%, 12%, 16% and 20%). Titanium carbide powder (of 44 μm and 2μm) was considered in the experiment. The specimens were prepared with an aspect ratio of 0.3 and deformation test under cold upsetting principle was carried out to determine true axial strain, true mean stress, true effective stress, true axial stress, true hoop stress, relative density, minimal stress ratio parameter, maximal stress ratio parameter and formability stress index under triaxial stress state condition. The workability parameters are determined and the results are discussed.