Effect of Adding TiZr-Based Amorphous Interlayer Through Electron Beam Welding on the Microstructure and Properties of Ti/Al Joints

In this study, electron beam welding (EBW) experiments for TA1 and industrial high-purity Al were carried out, and the effects of a Ti32.8Zr30.2Cu9Ni5.3Be22.7 amorphous interlayer on the microstructure and properties of the welded joints were investigated. This is the first application of this interlayer material in the field of Ti/Al dissimilar-metal welding. In order to better improve the interfacial reaction of the welded joints and effectively control the thickness of intermetallic compounds (IMCs), the electron beam was offset by 1 mm towards the Al side. The results indicate that the amorphous interlayer was beneficial for improving the performance of the welded joints, with the maximum tensile strength reaching 94.8 MPa, which was 97% of the strength of the Al base material (97.7 MPa). The thickness of the Ti-Al intermetallic compound (IMC) layer formed in the upper part of the welded joints was lower compared with the joints without an interlayer, and the IMC layer formed in the lower part of the welded joints was only 1–2 μm. Additionally, a large number of small-sized and dispersed Ti-Al and Al-Zr IMCs were generated on the Al side, which positively impacted the performance of the welded joints.