Abstract: Provided is an aluminum casting alloy with high strength, high elongation and high thermal conductivity, including: 6.5% by weight or more and 11.5% by weight or less of silicon (Si); 0.2% by weight or more and 0.4% by weight or less of magnesium (Mg); 0.32% by weight or more and 0.85% by weight or less of iron (Fe); and a remainder including aluminum (Al) and inevitable impurities, wherein ?-AlFeSi intermetallic compound with a cubic crystal structure is included in an aluminum matrix.

Abstract: Provided is a method for manufacturing an aluminum alloy exterior material for smart devices which is formed not by extrusion or die casting but by a strip casting method using a rotating mold, and an aluminum alloy exterior material manufactured by the method. In accordance with an embodiment, the method includes: preparing a molten aluminum alloy; casting the molten aluminum alloy into a sheet shape using a rotating mold to form an aluminum alloy cast sheet; and anodizing the aluminum alloy cast sheet, wherein in the forming of an aluminum alloy cast sheet, X in Equation 1 below may have a value in the range of greater than 0 and equal to or less than 0.15. X=(WZn+WMg+WCu+WSi)/TC??<Equation 1> Here, WZn+WMg+WCu+WSi is the total content (wt %) of zinc, magnesium, copper and silicon) in the aluminum alloy, and TC is the thermal conductivity (W/m·K) of the rotating mold.

Abstract: Provided is a method for manufacturing an aluminum alloy exterior material for smart devices which is formed not by extrusion or die casting but by a strip casting method using a rotating mold, and an aluminum alloy exterior material manufactured by the method. In accordance with an embodiment, the method includes: preparing a molted aluminum alloy; casting the molten aluminum alloy into a sheet shape using a rotating mold to form an aluminum alloy cast sheet; and anodizing the aluminum alloy cast sheet, wherein in the forming of an aluminum alloy cast sheet, X in Equation 1 below may have a value in the range of greater than 0 and equal to or less than 0.15. X=(WZn+WMg+WCu+WSi)/TC??<Equation 1> Here, WZn+WMg+WCu+WSi+WSi is the total content (wt %) of zinc, magnesium, copper and silicon) in the aluminum alloy, and TC is the thermal conductivity (W/m·K) of the rotating mold.

Abstract: Disclosed herein is a method for producing a thin sheet of an Al—SiC composite material, which comprises the steps of: mixing aluminum powders and SiC powders to give spraying powders; and plasma-spraying the spraying powders on a graphite substrate to form a thin sheet. According to the method of the present invention, the composite material having low thermal expansion coefficient, high thermal conductivity and low density, which is suitable for use as a thermal management material for electronic devices, can be produced by a simple production process.

Abstract: Disclosed herein is a method for producing a thin sheet of an Al—SiC composite material, which comprises the steps of: mixing aluminum powders and SiC powders to give spraying powders; and plasma-spraying the spraying powders on a graphite substrate to form a thin sheet. According to the method of the present invention, the composite material having low thermal expansion coefficient, high thermal conductivity and low density, which is suitable for use as a thermal management material for electronic devices, can be produced by a simple production process.