偏晶合金定向凝固过程中第二相规则与非规则转变理论分析
Theoretical Analysis of Transition Between Regular Fiber and Irregular Fiber in Directionally Solidified Monotectic Alloys
崔红保1 , 王海燕1 , 郭景杰2
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作者单位：(1. 河南理工大学 材料科学与工程学院，河南 焦作454000； 2. 哈尔滨工业大学 材料科学与工程学院，黑龙江 哈尔滨150001)
中文关键字：偏晶合金； 定向凝固； 判据
英文关键字：monotectic alloys; directional solidification; criterion
中文摘要：基于改进的Jackson-Hunt 模型，在考虑了偏晶反应中三相之间存在密度差会引起流动的情况下，对偏晶合金定向凝固耦合共生行为进行理论分析，推导出偏晶合金定向凝固界面前沿的溶质分布方程，进而求得凝固界面前沿的过冷度；并综合考虑界面能、第二相体积分数以及液相线斜率的因素，对偏晶合金定向凝固过程中规则与非规则纤维转变提出一个新的判据。结果表明，理论预测与实验观察的第二相纤维规则情况吻合较好。
英文摘要：The modified Jackson-Hunt model was applied for theoretical analysis of couple growth during the monotectic directional solidification when the density differences which caused fluid flow between the three phase were considered, the solute distribution equation of solidification interface front was deduced during the monotectic directional solidification, and then the undercooling of solidification interface front can be calculated. A new criterion to determine whether regular or irregular morphology occurs was proposed. This criterion includes the effect of interfacial energy, volume fraction and liquidus slope on the morphologies. The results show that the predicted morphologies of given monotectic systems by the model are concordant with the observing results by experiment.