Abstract
Effect of high temperature solution treatment of AC4CH aluminum casting alloy was studied mainly in view of tensile properties, changes in resistance ratio, differential scanning calorimetry and variations of microstructures. Changes in resistance ratio were remarkable in accordance with the increase of the solution treatment temperature suggesting an effective solutionizing and promotive effect thereof. According to differential scanning calorimetry, the amount of endothermic reaction heat flow increased steeply in relation to the rising of the solution temperature, also indirectly suggesting an increase of the amount and extent of the solutionizing of the elements as being confirmed basing upon the electric resistance ratio measurements. Microscopic observations of the specimen solution treated at high temperature showed an effective globalization of eutectic silicon.
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