Abstract
The present study aimed to address the effect of multi-pass friction stir processing on the microstructure and mechanical features of AA3105/SiC composites fabricated using the sandwich method. To this end, 11–18-µm SiC particles were deposited as a layer between AA3105 aluminum sheets using the spraying method, and then, the sheets were sandwiched. The results indicated that an effective shear zone was generated on the advancing side of the stir zone after the second pass, where the reinforcement particles existed and were distributed by the matrix and no particle agglomeration was observed. In addition, the bulk composite fabricated with four passes exhibited that particle distribution became even more homogeneous and showed excellent bonding between the SiC particles and the AA3105 matrix. The results also revealed that after each FSP pass, toughness and ultimate tensile strength showed progressive improvement. Further, the microstructure homogeneity promoted by increasing FSP passes resulted in simultaneous improvement in strength and toughness in the FSPed samples.
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