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基于Miedema混合焓模型外推出三元合金的热力学性能,利用合金成分的特点计算出了Ti-46Al-8Nb-0.1Er四元合金的各组元间的部分热力学性能,并结合Toop模型得出合金的组元活度及活度系数。结果表明,在此四元系中Er只与Al发生反应,与其它组元之间无反应,生成Er-Al化合物。然而在热力学上,Er2O3比Er-Al化合物更易形成,实验中熔体里不可避免的微量氧的介入,使得合金熔炼过程中Er首先与O结合形成Er2O3颗粒,且此Er2O3相在XRD测试分析证明得到。Er具有净化合金熔体、降低合金基体氧含量和析出强化的作用。
Based on the Miedema mixed enthalpy model, the thermodynamic properties of the ternary alloy were extrapolated. The thermodynamic properties of the ternary Ti-46Al-8Nb-0.1Er alloy were calculated by the characteristics of the alloy composition. The Toop model was used to obtain the alloy Of the component activity and activity coefficient. The results show that in this quaternary system, Er only reacts with Al and does not react with other components to form Er-Al compounds. However, thermodynamically, Er2O3 is more easily formed than Er-Al compound. In the experiment, the inevitable infiltration of trace oxygen in the melt makes the Er first combine with O to form Er2O3 particles, and the Er2O3 phase is proved by XRD test get. Er has the function of purifying the alloy melt, reducing the oxygen content of the alloy matrix and precipitating and strengthening.