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Jul -07 -2023

Abstract｜Taking commercial A356 aluminum alloy as the research object, the effects of casting methods (metal mold casting, liquid squeeze casting, semi-solid squeeze casting) on ​​its microstructure, thermal conductivity and mechanical properties were studied. The results show that liquid and semi-solid squeeze casting significantly reduces casting defects and improves alloy compactness. Among them, compared with the metal mold casting, the crystal grains of the liquid extrusion casting parts are obviously refined, the eutectic Si phase is transformed from a coarse lath shape to a long rod shape, the tensile strength of the alloy is increased from 179.930 MPa to 209.446 MPa, and the elongation The ratio increased from 3.19% to 6.93%, the hardness (HB) increased from 55 to 64, and the thermal conductivity increased from 150.064 W/(m∙K) to 153.072 W/(m∙K); after semi-solid squeeze casting , the primary α-Al grains are uniformly distributed and rounded in shape. The size of the eutectic Si phase is reduced, the boundary is round and blunt, and the segregation is eliminated. The tensile strength of the alloy is 223.514 MPa, the elongation reaches 13.68%, the hardness (HB) reaches 71, and the thermal conductivity increases to 160.220 W/(m∙K).

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