To evaluate quality of cast aluminum alloys quantitatively and intuitively, some quality indices and quality maps have been introduced. Quality index is a measure to quantitatively evaluate the quality of cast aluminum alloys based on the tensile mechanical properties, and quality map is generated to intuitively support material selection on the basis of the quality index. Different quality indices such as Q, Q(R), Q(C) and Q(0) have been used to evaluate the quality of the cast aluminum alloys. However, they lack in reflecting and evaluating overall performance throughout all the tensile mechanical properties such as YS, UTS, E-f and W, comprehensively. The quality maps show the quality level according to only the pairs of tensile properties such as (UTS, E-f), (YS and E-f) or (YS, W). The quality indices and quality maps cannot directly show the quality levels according to artificial aging heat treatment condition. We developed overall quality indices according to tensile mechanical properties, and overall quality index and overall quality map according to artificial aging heat treatment condition for the cast aluminum alloys A357 by using multi-criteria decision-making (TOPSIS) and multiple regression model. The performances of the overall quality indices were evaluated using mean absolute errors, mean relative errors and determination coefficients. The overall quality indices and overall quality map help materials designers and engineers evaluate the overall performance of the cast aluminum alloy A357 and select the reasonable artificial aging heat treatment condition, quantitatively and intuitively.
