Utilization of Recycled Aluminum Alloy for Heat Sinks with Thin Fins Made by Semisolid Die Casting

Fe was added to Al-25 %Si to make a model alloy of recycled Al-25 %Si. The effects of Fe addition on flow length, the formability of thin fins, casting cracks, and heat dissipation were investigated. The addition of Fe did not significantly affect flow length, the formability of thin fins, casting cracks, and heat dissipation. To produce an economical aluminum alloy with a Si content of 25 %, Si was added to ADC12 aluminum alloy for die casting. ADC12, which contains about 10 % Si, was made from recycled aluminum alloy and was economical. A heat sink with thin fins, where the fin tip was 1 mm and the fin height was 50 mm, could be made using Si-added ADC12 with a Si content of 25 %. The addition of Si to ADC12 up to 25 % was effective in creating an economical heat sink with thin and tall fins.