Usage of surface metal composites in the field of orthopedics is increasing nowadays due to their biocompatibility. But fabrication of surface composites with all the desired properties is the major challenge. The primary objective of this research is to produce a surface composite of a magnesium AZ31B alloy reinforced with different volume fractions (0%, 5%, 10%, 15%, 20 and 25%) of hydroxyapatite (HA) microparticles using friction stir processing (FSP). This work demonstrates that variation of uniform distribution of HA particles (HAP) is observed in all volume percentage of AZ31B-HA powder composites. As percentage of reinforcement decreases up to 10% of volume tensile strength is decreasing but above that tensile strength is increasing. Above 10% HAP volume percentage addition of more HAP has no effect on wear coefficient. The minimum value of wear coefficient is observed at 20% HAP volume percentage with the value of 0.2728 µg/N-m which is 81.68% less than 0% HAP composition. As the volume percentage of HAP increasing from 0% to 15% around 27.61% increase in the hardness value is observed and decrease in hardness value from 15% to 25% around 17.11% is observed. Rockwell hardness values are more at advancing side than retreating side in all volume percentages of HAP.

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