Nb-Ti-Si 三元系相平衡的热力学计算
来源期刊：中南大学学报(自然科学版)1998年第4期
论文作者：张岳兰 刘华山 金展鹏
文章页码：64 - 67
关键词：Nb;Ti;Si;Nb－Ti－Si三元系;相图计算;等温截面;液相面投影图
Key words：niobium; titanium; silicon; Nb-Ti-Si ternary system; Calphad; isothermal section; liquidus projection
摘 要：采用相图计算(Calphad)技术，选用Muggianu外推模型从3个边界二元系外推计算了Nb－Ti－Si三元相图．二元化合物Ti3Si和Nb3Si同为Ti3P晶型结构，被处理为一个线性化合物，用(Nb,Ti)3Si亚点阵模型来描述．计算结果能描述现有的大部分实验数据．计算的液相面投影图显示该三元系中存在7个四相液相反应和9个初晶区；此外，还计算了3个不同温度下的等温截面．计算结果对该合金相图的进一步实验测定和合金设计提供了参考依据．
Abstract: Phase equilibria in Nb Ti Si system is calculated using descriptions of lowed-order systems without regard to ternary intermediate compounds. Because compounds Nb3Si and Ti 3Si have the same crystal structure, they are thought of as one phase described with the sublattice model (Nb,Ti)3Si. The results of calculation can describe most experimetal data. And the calculated liquidus projection shows that there exist seven four-phase equilibria and nine primary surfaces. In addition, isothermal sections are obtained at three different temperatures. This calculated work may be helpful to the further experimental studies and may offer useful information for applications.
