Modeling of yield strength in binary hypoeutectic alloy under high pressure solidification

Abstract

A new mathematical model was developed to predict the yield strength under high pressure solidification. This model can be used in the binary hypoeutectic alloy system which contains solid solution and intermetallic compound. Following this model, the total change of yield strength under high pressure is affected by solid solution, eutectic spacing and grain size. This effect can be quantitatively measured by the change of a pressure-solid solubility function f(P). This model reveals that along with the variation of f(P), change in the solubility and eutectic spacing lead to opposite influences on yield stress. Application of the model to the binary Mg-20.3 wt%Al solidified under different pressure was conducted. It was found that this model can perfectly explain the change in the yield strength of Mg-20.3 wt%Al alloy solidified under high pressure. This model can provide theoretical guidelines for choosing reasonable solidification pressure to optimize microstructure and properties of binary hypoeutectic alloy in high pressure solidification.