▎ 摘　　要

The present research investigated the tribological and the thermal properties of Mg-3Al-xGNP alloy nanocomposites, fabricated through a powder metallurgy route with microwave assisted sintering followed by hot extrusion. Graphene nanoplatelets (GNPs) were incorporated as reinforcements in different amounts (0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) into pure Mg and Mg-3Al alloy. The values of coefficient of friction and wear rate of pure Mg, Mg-3Al alloy, and Mg-3Al/xGNPs (x = 0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) nanocomposites were evaluated on a pin-on-disc tribometer under dry sliding conditions, and scratch testing was performed under a vertical load of 9.8 N. The ignition temperatures of Mg-3Al-0.1GNP, Mg-3Al-0.3GNP, and Mg-3Al-0.5GNP were respectively increased by 2.31%, 5.34%, and 5.7%. It was noticed that the reinforcement of 0.3 wt.% GNP yielded the best mechanical and tribological properties.