利用TiAl二元系的热力学模型，计算了Ti-(44—50)Al(原子分数，%)合金包晶反应附近的相图，确定了初生相β和包晶相α的固、液相线，得到了界面响应函数所需的部分参数. 利用这些参数及单相合金凝固界面响应函数模型，计算了初生相β和包晶相α的界面温度与生长条件变化的关系；结合最高界面生长温度判据，分析了Ti-(44—50)Al合金凝固过程中的相选择和组织演化，并确定了Ti-Al合金稳态凝固时以成分和G/v为框架的相选择图.
Using the thermodynamic model of TiAl binary system, part of phase diagram of Ti-(44-50)Al around the peritectic reaction was calculated and the solidus and liquidus of primary phase β and peritectic phase α were determined and the parameters used for interface response function were obtained. The interface temperatures of primary phase β and peritectic phase α were calculated for different growth conditions. According to the criterion of the maximum growth temperature, the phase selection and microstructure evolution of Ti-(44-50)Al were theoretically studied and a microstructure-selection map of TiAl stable state solidification as a function of the melt composition and the G/v ratio was constructed.
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