(1. 安徽理工大学 材料科学与工程学院，淮南 232001；
2. 合肥工业大学 材料科学与工程学院，合肥 230009)
摘 要: 采用粉末冶金法制得粉煤灰/Al-25%Mg复合材料，研究不同粉煤灰含量对复合材料微观组织、硬度和摩擦磨损性能的影响，采用扫描电子显微镜观察复合材料的磨损表面形貌，并对其磨损机制进行探讨。结果表明：随着粉煤灰含量的增加，复合材料的硬度呈现先增大而后减小的趋势；在较低粉煤灰含量和较低载荷下，该复合材料的摩擦因数均低于基体铝合金的，并且随粉煤灰含量的增加复合材料的耐磨性有所提高，复合材料的磨损机制主要为粘着磨损和磨粒磨损；在较高粉煤灰含量和较高载荷下，该复合材料的磨损机制转化为以剥层磨损和磨粒磨损为主。
关键字: 粉煤灰；铝基复合材料；摩擦磨损；磨损机制
fly ash/Al-Mg alloy composites
（1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China;
2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The fly ash particles reinforced Al-25%Mg alloy composites were fabricated by powder metallurgy method. The influence of different fly ash contents on the microstructure, hardness and friction and wear behavior of composites were investigated at constant sliding velocity of 400 r/min. The worn surfaces of composites were observed by scanning electron microscopy, and the worn mechanism of composites was discussed. The results show that the hardness of composites increases firstly and then decreases with increasing fly ash content. Under the lower loads and at the lower fly ash content, the friction co-efficient is steadily lower than that of Al alloy matrix. The wear resistance of composites increases with the volume fraction of fly ash particles and the wear mechanism is characterized as abrasive wear and adhesive wear. On the other hand, the wear mechanisms in the composites are transformed with increasing load and fly ash volume, mainly it is delamination wear and abrasive wear.
Key words: fly ash; aluminum matrix composite; friction and wear; wear mechanism
