The tribological behavior of aged Al−Sn−Cu alloy rubbed in the presence of lubricant over a range of sliding velocities and normal loads was investigated. The results showed that peak-aged (PA) alloy had a better tribological behavior than under-aged (UA) and over-aged (OA) alloys, which could be attributed to the optimized strength−ductility matching and a better hardness under PA condition. Wear rate and friction coefficient showed great sensitivity to applied sliding velocity and normal load. The wear rate and friction coefficient of the alloy exhibited a reduction trend with the increase in sliding velocity. The low wear rate and friction coefficient of alloy at high velocities were due to the effectively protected film and homogeneous Sn on surface. However, an increase in normal load led to an obvious increment in wear rate. The friction coefficient exhibited a fluctuant trend with the increase of normal loads. The seriously destroyed film and abraded Sn resulted in poor tribological behavior at high normal loads. The Sn particles and lubricant film which includes low shear interfacial lubricating layer and oxide tribolayer are the key to the tribological behavior of Al−Sn−Cu alloy.%研究在油润滑状态下摩擦速度和加载载荷对时效态Al−Sn−Cu合金摩擦磨损性能的影响。结果表明：由于峰时效合金较欠时效和过时效合金具有最佳的强度−塑性配比和更高的硬度，因此峰时效合金表现出最优的摩擦磨损性能。摩擦速度和加载载荷对合金磨损率和摩擦因数具有显著影响。随着摩擦速度的增大，磨损表面的润滑膜和Sn相更为均匀，合金的磨损率和摩擦因数均降低；然而随着加载载荷的增加，均匀的润滑膜和Sn相被严重破坏，合金磨损率急剧上升。Sn相和包括中间润滑层、摩擦氧化层的润滑膜是影响Al−Sn−Cu合金摩擦磨损性能的决定性因素。
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