根据亚规则溶液模型，进行锰铜二元系的热力学计算表明，γMn－Cu合金在(γ＋α)亚稳互溶区确实存在Spinodal分解，在400～600oC时效发生Spinodal分解的是浓度范围为60～90at％Mn的合金。与硬度法相比，采用测量尼尔点来确定Spinodal分解的区域较为可靠。
Sub－regular solution model is used to calculate the thermodynamic of γ Mn－Cu alloy. It is revealed that there exists Spinodal decomposition in (γ＋α) metastable miscibility gap. For the Mn－Cu alloy with composition of 60～90 at％ Mn Spinodal decomposition will occurs during aging at 400～600oC. The Spinodal decomposition range measured by TN point is more reliable than by hardness.
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