ALUMINUM ALLOY WITH EXCELLENT HIGH-TEMPERATURE STRENGTH AND THERMAL CONDUCTIVITY, AND PROCESS FOR PRODUCTION THEREOF

摘要

An aluminum alloy with excellent high-temperature strength and thermal conductivity, which is created both by adjusting the composition thereof so as to inhibit the deterioration of high -temperature strength and by minimizing the Mn content to reduce the amount of Mn solid-soluted in aluminum. An aluminum alloy having a composition which contains 12 to 16 mass% of Si, 0.1 to 2.5 mass% of Ni, 3 to 5 mass% of Cu, 0.3 to 1.2 mass% of Mg, 0.3 to 1.5 mass% of Fe, 0.004 to 0.02 mass% of P, 0 to 0.1 mass% of Mn, and, if necessary, at least one of 0.01 to 0.1 mass% of V, 0.01 to 0.6 mass% of Zr, 0.01 to 0.2 mass% of Cr and 0.01 to 0.2 mass% of Ti. The aluminum alloy can be produced by subjecting a molten aluminum alloy having a composition as described above to ultrasonic irradiation at a temperature equal to or exceeding the liquidus curve, and then casting the resulting alloy within 100 seconds after the completion of the ultrasonic irradiation.