Abstract
AlSi7Mg investment cast test bars were produced using low-pressure die casting and ultrasonically refined during cooling. The microstructure and mechanical properties of the samples at different distances from the acoustic radiator were characterized for 650°C pouring temperature. The combined technique lead to cast samples free from gas porosities and solidification defects, promoted the formation of small α-Al globular grains, modified the eutectic silicon, dispersed and decreased the size of intermetallic phases. The alloy mechanical properties were improved, increasing the ultimate tensile strength, yield strength and strain.
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