科研之友
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摘要
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.
