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采用氟盐铝热反应法制取不同稀土含量的Al-Ti-B-RE中间合金,并对其微观组织和细化效果进行了分析,讨论了稀土元素对Al5Ti1B组织及性能的影响。X射线衍射及能谱分析证明:稀土元素和TiAl3结合生成了Ti2Al20RE,同时TiAl3尺寸减小、数量减少;TiB2尺寸、形态不受影响,但分布更加均匀弥散。细化效果试验表明稀土元素确实可以提高Al5Ti1B中间合金的细化效果。在5Ti1B系Al-Ti-B-RE中间合金中,稀土元素的最佳质量分数为3.53%,此时能取得最理想的微观组织和细化效果。
The Al-Ti-B-RE master alloy with different RE content was prepared by hot reaction of fluoroaluminate and its microstructure and refining effect were analyzed. The effects of rare earth elements on the microstructure and properties of Al5Ti1B were discussed. X-ray diffraction and energy spectrum analysis show that Ti2Al20RE is formed by the combination of rare earth elements and TiAl3, while the size of TiAl3 decreases and the number decreases. The size and morphology of TiB2 are not affected but the distribution is more uniform. Refinement effect tests show that rare earth elements can indeed improve the refining effect of Al5Ti1B master alloy. In the 5Ti1B Al-Ti-B-RE master alloy, the best mass fraction of rare earth elements is 3.53%, at this time, the best microstructure and refining effect can be obtained.