▎ 摘　　要

Nickel matrix composites reinforced with graphene exhibiting different morphology (i.e., shape and size) with varying content (0.5 and 1 wt.%) have been prepared using ball-milling and the spark plasma sintering technique. The graphene-based reinforcements used in this study were procured from different sources, processed using different techniques, and varied in shape, size, and structural features. The effect of graphene morphology on the microstructure, mechanical properties, and tribological behavior of these composites has been investigated. The results reveal excellent enhancement in the tensile yield strength, reduction in grain size, and coefficient of friction of the composites after incorporating the graphene-based reinforcing material in the nickel matrix. The influence of different types of reinforcement varying in size, surface, and structure on their dispersal and the resultant effect on the properties are discussed. Scanning electron microscopy and energy dispersive spectroscopy were used to investigate the fracture surface and wear tracks for further investigation.