In this study carbonaceous (C-based) reinforced AZ91 matrix composites were fabricated with the same weight fraction of 0.50 wt.% via semi powder metallurgy. The hot pressing test machine was used under high purity argon atmosphere. Multi-wall carbon nanotube (MWCNT), Graphene Nanoplatelets (GNPs) and Fullerene (C60) were used as reinforcements. Microstructure, hardness and corrosion performances of fabricated composites were investigated. Results show that hardness of AZ91 alloy was improved with the addition of carbonaceous reinforcements. AZ91/C60 composite exhibited highest hardness performance. However, corrosion performance of AZ91 was affected negatively by the addition of reinforcements. MWCNT exhibited highest corrosion rate among the fabricated samples.