The document discusses a study that investigated the effect of adding graphite particles to an aluminum bronze alloy prepared by powder metallurgy. Samples containing 0-3% graphite by weight were tested. Testing showed that adding 0.3% graphite increased the hardness by 7.93% and compressive strength by 11.62% compared to the base alloy. Machining tests found that 0.3% graphite reduced surface roughness by 22.65-32.38% compared to the base alloy when turning under various conditions. The study suggests 0.3% graphite provides the greatest improvement to the mechanical and machining properties of the aluminum bronze alloy.