In this study, nano-sized titanium dioxide particles were reinforced with pure magnesium by powder metallurgy technique for five different weight fractions of reinforcement such as 4 wt%, 8 wt%, 12 wt%, 16 wt%, and 20 wt% respectively. Samples of these compositions are iso-statically cold compacted into cylindrical specimens of diameter and length each 15 mm respectively, followed by sintering and hot extrusion with an extrusion ratio of 1.56:1. SEM micrographs of blended composite powders before compaction confirmed the distribution of reinforcement has been uniform throughout the matrix with no presence of any agglomeration. Micro structural analysis of extruded specimens revealed the significant matrix grain growth. The reinforcement may interrupt the matrix grain growth on grain boundaries during extrusion. Targeting for biomedical applications like bone implants, orthopedic surgery etc., the mechanical behavior of the composite such as micro hardness, and compressive strength have been studied. It was observed from the study that the mechanical properties have been significantly improved by adding reinforcement compared to pure magnesium and better mechanical behavior have been noticed for composite with higher contribution of reinforcement.
Keywords : Magnesium Matrix Composite, Nanoparticulate, Titanium Dioxide, Biomedical, Bone Implants, Mechanical Behavior.