TiAl基合金的非晶钎焊

Brazing of a TiAl based alloy with Zr_(65)Al_(7.5)Cu_(27.5) amorphous ribbon

利用一种典型的块体非晶成分Zr65Al7.5Cu27.5(摩尔分数,%),制备成非晶条带焊接TiAl基合金,研究了焊接接头的组织结构和成分分布,并分析了钎焊过程的组织演变规律。研究结果表明,利用Zr65Al7.5Cu27.5非晶条带可以成功焊接TiAl基合金。焊缝区组织出现了明显的分层现象,从中部到界面区依次是先析出的Zr2Cu型和ZrCu化合物,粗大的Zr2Cu型化合物和Ti2Al型柱状晶。焊接母材中的Al元素向焊缝发生了扩散,在界面区形成了一层很薄的反应层。

The melt-spun Zr65Al7.5Cu27.5 amorphous alloy, a typical bulk metallic glass with high glass ability, was used to braze a TiAl-based alloy. The microstructure and elements distribution have been studied. The results show that the Zr65Al7.5Cu27.5 amorphous ribbons can successfully braze the TiAl-based alloy. Layered structures appear in the brazing seam. From the middle region to the interface region of the brazing seam, the materials are the Zr2Cu-type and ZrCu precipitates, the coarse Zr2Cu-type grains, and the Ti2Al-type columnar grains. The Al element in the substrate diffuses into the brazing seam, forming a thin reaction layer in the interface region.