Abstract Fe-Al-Ta eutectic composites have been paid more attentions for high temperature application. Nevertheless, still there is a lack of research on microstructural characteristics and crystal growth mechanism of this eutectic obtained by high temperature gradient directional solidification technique. As such, Fe-Al-Ta eutectic composites were prepared by high temperature gradient electron beam floating zone melting technique in the present paper. Microstructures, solid/liquid interface morphologies and preferential orientations of the Fe-Al-Ta eutectic composites at different solidification rates were studied. Moreover, effect of interface perturbation wavelength on stability of the solid/liquid interface was calculated according to M-S theory and Kurz-Fisher model, respectively. These are consistent with the experimental results well.

中文翻译：

---

Fe-Al-Ta共晶电子束浮区熔炼定向凝固

摘要 Fe-Al-Ta共晶复合材料在高温应用中越来越受到重视。然而，对于这种通过高温梯度定向凝固技术获得的共晶的显微组织特征和晶体生长机制仍然缺乏研究。为此，本文采用高温梯度电子束浮区熔炼技术制备了Fe-Al-Ta共晶复合材料。研究了不同凝固速率下 Fe-Al-Ta 共晶复合材料的微观结构、固/液界面形态和优先取向。此外，根据MS理论和Kurz-Fisher模型，分别计算了界面微扰波长对固/液界面稳定性的影响。这些与实验结果非常吻合。