Abstract
Cast A357 alloy is a typical heat-treated strengthened aluminium alloy. Secondary dendrite arm spacing (SDAS) has a very significant effect on the mechanical properties of the alloy. It is important to study the effect of SDAS on the aging kinetics of the alloy. The effect of SDAS on aging kinetics of A357 alloy was studied through hardness tester and optical microscopy. It was found that under the same solid solution treatment conditions, with the increasing of secondary dendrite arm spacing, the hardness of A357 alloy decreases after solid solution treatment; the aging peaks of alloy samples with different wall thicknesses delay with the increase of SDAS; the mathematical model of aging mechanical properties was obtained by regression analysis of the experimental results of aging treatment.
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