(1. 安徽理工大學(xué) 材料科學(xué)與工程學(xué)院，淮南 232001；
2. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009)
摘 要: 采用粉末冶金法制得粉煤灰/Al-25%Mg復(fù)合材料，研究不同粉煤灰含量對(duì)復(fù)合材料微觀組織、硬度和摩擦磨損性能的影響，采用掃描電子顯微鏡觀察復(fù)合材料的磨損表面形貌，并對(duì)其磨損機(jī)制進(jìn)行探討。結(jié)果表明：隨著粉煤灰含量的增加，復(fù)合材料的硬度呈現(xiàn)先增大而后減小的趨勢；在較低粉煤灰含量和較低載荷下，該復(fù)合材料的摩擦因數(shù)均低于基體鋁合金的，并且隨粉煤灰含量的增加復(fù)合材料的耐磨性有所提高，復(fù)合材料的磨損機(jī)制主要為粘著磨損和磨粒磨損；在較高粉煤灰含量和較高載荷下，該復(fù)合材料的磨損機(jī)制轉(zhuǎn)化為以剝層磨損和磨粒磨損為主。
關(guān)鍵字: 粉煤灰；鋁基復(fù)合材料；摩擦磨損；磨損機(jī)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
