In the present work, 2024-T351 Al alloy reinforced with alumina particulates (Al₂O_3p) was elaborated using friction stir processing (FSP). The effect of solution heat treatment followed by subsequent aging on microstructure, hardness, and tribological behavior is discussed. It was noticed that the hardness of the as-FSPed 2024-T351/Al₂O_3p was slightly enhanced in comparison to the as-received AA2024-T351 material, whereas the resulting wear resistance was remarkably improved. After heat treatment process, the composite volume increased, and swelling and pores were created at the processed area. The heat treatment caused a degradation in wear resistance compared to as-FSPed composites. The precipitation mechanism changed for AA2024/Al₂O_3p; reactions occurred at grain boundaries between Al₂O₃ and Cu or Mg, causing their depletion from the Al matrix. Intriguingly, the precipitation mode in heat-affected zone of the matrix also changed to grain boundary precipitation.

在本工作中，使用摩擦搅拌工艺（FSP）精心制作了用氧化铝颗粒（Al ₂ O _3p）增强的2024-T351铝合金。讨论了固溶热处理，随后的时效处理对组织，硬度和摩擦学行为的影响。注意到，与原样的AA2024-T351材料相比，原样的2024-T351 / Al ₂ O _3p的硬度略有提高，而所得的耐磨性显着提高。经过热处理后，复合材料的体积增加，在加工区域产生膨胀和孔洞。相比于FSPed复合材料，热处理导致耐磨性下降。AA2024 / Al的析出机理发生了变化₂ O _3p ; 在Al ₂ O ₃与Cu或Mg之间的晶界发生反应，导致它们从Al基体中耗尽。有趣的是，基体热影响区的析出模式也转变为晶界析出。