Estimation of Dimensional Change of Al–10Si–Mg Alloy Castings during Heat Treatment

Al–10Si–Mg alloy have been used for die casting and additive manufacturing. In this study, solution–treated Al–10Si–Mg and Al–10Si alloys (mass％) were heat–treated at several temperatures and the linear dimensional changes arising from the heat–treatments were investigated. A theoretical model for calculating the linear dimensional change in Al–Si–Mg ternary alloys was proposed, and the theoretically and the experimentally determined linear dimensional changes were compared. It was found that the linear dimensional changes of Al–10Si–Mg and Al–10Si alloys were almost the same. In both alloys, the linear dimensional changes increased with the decrease of the heat–treatment temperature. The linear dimensional changes of Al–10Si–Mg and Al–10Si alloys agreed well with the values estimated by the proposed theoretical model. ［doi:10.2320/jinstmet.J2022031］ © 2022 The Japan Institute of Metals and Materials.