The multi-pass mode friction stir processing (FSP) was applied to Al-30%Mg₂Si in-situ composite under optimised conditions. Also, the influence of the pass number increase was evaluated on microstructure and dry sliding wear behaviour of composite at room temperature (RT) and High temperature (HT, 200ᵒC). The optimal RT wear test results were achieved in the three-pass processed (3P) sample.Furthermore, elevating the wear test temperature increased the wear rate and the ACOF of the as-cast composite, compared with RT condition. Nevertheless, covering the worn surface of the FSPed sample by fragmented and evenly distributed Mg₂Si particles and improved hardness (specifically in 2P and 3P samples) prevented the severe mass loss in FSPed samples and enhanced the HT wear resistance of Al-30Mg₂Si composite. The active wear mechanisms of the as-cast and FSPed composite were also studied at both RT and HT conditions.

在优化条件下，对Al-30％Mg ₂ Si原位复合材料进行了多道次摩擦搅拌处理（FSP）。同样，评估了通过次数增加对复合材料在室温（RT）和高温（HT，200°C）下的组织和干滑动磨损行为的影响。在三道次加工（3P）样品中获得了最佳的RT磨损测试结果，此外，与RT条件相比，提高磨损测试温度会提高铸态复合材料的磨损率和ACOF。然而，通过碎片状且均匀分布的Mg ₂覆盖了FSPed样品的磨损表面Si颗粒和更高的硬度（特别是在2P和3P样品中）可防止FSPed样品中严重的质量损失，并提高Al-30Mg ₂ Si复合材料的HT耐磨性。还研究了在RT和HT条件下铸态和FSPed复合材料的主动磨损机理。