A double reinforced layer on an aluminum alloy surface was produced using friction stir\nprocessing (FSP) by adding 34CrNiMo6 powder into Al (AA2024) substrate for better wear resistance\nand gradient transitions. The microstructures of the composites were analyzed using scanning\nelectron microscopy (SEM) and energy dispersive spectroscopy (EDS). The phase composition was\nexamined by X-ray diffraction (XRD). The results show that the double reinforced layer of the Al13Fe4\nintermetallic compound could be successfully fabricated via FSP. The volume fraction of Al13Fe4 in\nthe double reinforced layer was higher than in the single reinforced layer due to adding 34CrNiMo6\npowder and reinforced twice, and the Al13Fe4 particles were dispersed more homogeneously in the\ndouble reinforced layer. The interfaces between the double and single reinforced layer had a good\nmetallurgical bond. The microhardness of the double reinforcement layer was significantly increased.\nCompared with the AA2024 substrate, the microhardness of the double and single reinforced layers\nincreased five- (576 HV) and two-fold (254 HV), respectively.
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