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Abstract
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Due to the intrinsic structural features of single-sided stirring friction processing, including the attributes of non-uniformity and the front and backward sides of the tissue structure. To address this issue, this work uses the orthogonal test method for doublesided stirring friction processing of aluminum matrix composites supplemented with ZrB2 particles with varying parameters. The tensile strength of the material was 200.42 MPa, and the elongation at break was 24.5%, which is an improvement of 3.6% and 24.4%, respectively, compared with the one-sided processing. The average hardness of the weld core area is 84.0 HV when the rotational speed is 1000 r/min and the processing speed is 40 mm/min, which is 6.3% higher than that of the single-side stir friction machining. Dislocation plugs at grain boundaries and edge-type and deformation dislocations are present in the material matrix, according to combined SEM, EBSD, and TEM investigations. Following double-sided stirring friction machining, the average grain size in the weld core area is reduced from 5.56 μm in single-sided machining to 4.65 μm. Additionally, the grains exhibit improved anisotropy, with the percentage of small-angle grain boundaries falling from 31.4% to 26.7 % and the percentage of recrystallized organization rising from 49.7% to 65.2%.
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