(1. 中南大學 材料科學與工程學院，長沙 410083；
2. 中南大學 有色金屬先進結構材料與制造協(xié)同創(chuàng)新中心，長沙 410083)
摘 要: 研究在油潤滑狀態(tài)下摩擦速度和加載載荷對時效態(tài)Al-Sn-Cu合金摩擦磨損性能的影響。結果表明:由于峰時效合金較欠時效和過時效合金具有最佳的強度-塑性配比和更高的硬度，因此峰時效合金表現(xiàn)出最優(yōu)的摩擦磨損性能。摩擦速度和加載載荷對合金磨損率和摩擦因數(shù)具有顯著影響。隨著摩擦速度的增大，磨損表面的潤滑膜和Sn相更為均勻，合金的磨損率和摩擦因數(shù)均降低；然而隨著加載載荷的增加，均勻的潤滑膜和Sn相被嚴重破壞，合金磨損率急劇上升。Sn相和包括中間潤滑層、摩擦氧化層的潤滑膜是影響Al-Sn-Cu合金摩擦磨損性能的決定性因素。
關鍵字: Al-Sn-Cu合金；摩擦磨損性能；摩擦速度；加載載荷；時效
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China）
Abstract: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.
Key words: Al-Sn-Cu alloy; tribological behavior; sliding velocity; normal load; aging
