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以Ｍｉｅｄｅｍａ二元合金生成热模型为基础，结合一些基本热力学关系式，利用元素的基本性质计算了１０７３Ｋ下ＡｌＭｇ合金中组元Ｍｇ的活度及合金的部分热力学函数（ΔＨ，ＧＥ，ＳＥ）。结果表明，在１０７３Ｋ下，溶液中Ｍｇ的行为相对拉乌尔定律存在较大的负偏差；混合焓、过剩自由能与过剩熵在整个浓度范围内均为负值；混合焓最小值为－１１．４ｋＪ／ｍｏｌ，过剩自由能最小值为－８．７７ｋＪ／ｍｏｌ，过剩熵的绝对值较小，接近零。计算结果与实验数据吻合较好。
Based on the thermal model of Miedema binary alloy and the basic thermodynamic equations, the activity of Mg in AlMg alloy at 1073 K and the partial thermodynamic functions of the alloy (ΔH, GE, SE ). The results show that the behavior of Mg in solution has a large negative deviation from Raoult’s law at 1073K. The enthalpy of mixing, excess free energy and excess entropy are all negative in the whole concentration range. The minimum enthalpy of mixing is -11 .4kJ / mol, the minimum free energy of excess is -8.77kJ / mol, the absolute value of excess entropy is small, close to zero. The calculated results are in good agreement with the experimental data.