Ti-Zr二元合金在β相区的互扩散行为研究

Research on Interdiffusion Behavior of Ti-Zr Binary Alloy in the β Phase

摘要:

通过扩散偶技术，利用电子探针（EPMA）研究了Ti-Zr二元合金在β相区（950至1150 ℃）的互扩散行为。采用Den Broeder方法及Hall修正法计算了Ti-Zr二元合金的互扩散系数, 其范围为10-14~10-12 m2/s；计算了扩散激活能Q和频率因子D0，两者均随Zr浓度的增加呈现先增加后减小的规律，其峰值均出现在50at%Zr浓度附近。用Vignes-Birchenall方法计算了Ti-Zr二元合金在扩散组元极限浓度处的杂质扩散系数，并与用Hall修正方法计算的互扩散系数进行了对比，二者结果比较接近。

Abstract:

The interdiffusion behavior of Ti-Zr binary alloy in the β phase (950 to 1150 oC) was studied through the diffusion couples by EPMA. The interdiffusion coefficients of the Ti-Zr binary alloy were calculated by the Den Broeder method and modified by the Hall method in the concentration limits between 10-14 and 10-12 m2/s. The diffusion activation energy Q and frequency factor D0 were calculated. The results show that Q and D0 increase at first and then decrease with the increase of Zr concentration and a summit can be got at about 50at% Zr concentration. The impurity diffusion coefficients in concentration limits were calculated by Vignes-Birchenall method and they were compared with the interdiffusion coefficients determined by Hall modification method. It is found that their results are similar.