Brazing of a TiAl-based alloy with Zr₆₅Al_7.5Cu_27.5 amorphous ribbon

In this paper, the melt-spun Zr₆₅Al_7.5Cu_27.5 amorphous alloy, a typical bulk metallic glass with high glass ability, was used to braze a TiAl-based alloy. The mierostructure and elements distribution have been studied. The results show that the Zr₆₅Al_7.5Cu_27.5 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 miorestures 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.