Calculation of the liquidus temperature for hypo and hypereutectic aluminum silicon alloys

An accurate knowledge of liquidus temperatures permits the prediction of a variety of metallurgical characteristics for a given alloy, including the melt treatment and casting temperatures (superheat). Three equations to determine liquidus for hypoeutectic aluminium alloys are reported in the literature. There is, however, no algorithm for calculation of the liquidus temperature for hypereutectic Al-Si alloys. In this paper algorithms are developed to predict the liquidus temperature of both hypo and hypereutectic 3XX series of aluminium alloys, based on their chemical compositions (minor and major elements). These algorithms are based on the new “element-equivalency concept”. The accuracy of the calculated liquidus temperatures for 3XX hypo and hypereutectic alloys were statistically examined with the values measured by the aluminum thermal analysis platform (AlTAP).