In this work, we focus on contrasting the mechanical properties of two metal matrix composites made from Al6061/Ni and Al6061/Cr. Metal matrix composites based on Al6061, reinforced with proportions from 0% to 2.7% in 0.9 percent increments, created by the stir casting method. In order to enhance the self-lubricating behavior and wettability, a fixed fraction of 2.7 wt. % of graphite and 0.9 wt. % of magnesium was added. The developed MMCs were subjected to mechanical testing as per ASTM standards. Compared to chromium, nickel's contribution to the strengthening action is crucial. In terms of ultimate tensile strength and hardness, Al6061/Ni MMCs outperform Al6061/Cr MMCs, but Al6061/Cr MMCs excel in elongation, flexural strength, and impact strength. This study's findings confirmed that adding nickel and chromium to Al6061 alloy induced structural modifications that improved the material's mechanical properties.