Er对Al-Zn-Mg合金微观组织与摩擦性能的影响

采用扫描电镜(SEM)、能谱仪(EDS)、透射电镜(TEM)和材料表面综合测试仪研究了Er对Al-Zn-Mg合金微观组织和力学性能的影响，并研究其在不同载荷下的摩擦磨损行为。结果表明，添加Er后合金伸长率提高约30%,晶粒尺寸明显细化，平均晶粒尺寸减小约68%。合金在摩擦过程中经历了摩擦副磨合和稳定磨损两个阶段，随着载荷的增大，摩擦因数曲线波动增大。O在摩擦层大量富集，证明了氧化磨损机制的存在。加载载荷为30 N时为磨粒磨损、疲劳磨损以及粘着磨损混合作用机制；加载载荷为70 N时磨粒磨损加剧并伴随疲劳磨损，且添加Er可以降低合金表面的剥落趋势，从而减少磨损。

Effect of Er on microstructure and wear properties of Al-Zn-Mg alloy

Effect of Er on microstructure and mechanical properties of Al-Zn-Mg alloy as well as the wear behavior of the alloy under different loads were studied by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and material surface comprehensive tester. The results show that with the addition of Er, the elongation of the alloy is increased by about 30% and the grain size is significantly refined as the average grain size reduces by about 68%. The alloy experiences two stages of running-in and stable wear during wear process, and the wear factor curves fluctuate with the increasing of load. The enrichment of O element in the tribolayer indicates the oxidation wear mechanism. Under the load of 30 N, the wear mechanism is mixed up by the abrasive wear, fatigue wear and adhesive wear. Under the load of 70 N, the wear mechanism was mainly the abrasive wear with fatigue wear, and the wear loss is reduced due to the decrease of surface delamination of the alloy with the addition of Er.