Microstructural Characterization of Intermediate Layer Produced at Aluminum/Metallic Glass Interface Fabricated by Magnetic Pulse Welding

Abstract

Lap joining of crystalline pure aluminum and metallic glass (Zr₄₈Cu₃₆Al₈Ag₈ and Cu₅₀Zr_42.5Al_7.5) was carried out by using magnetic pulse welding. Transmission electron microscopy was performed for the welding interface in order to investigate microstructure of the intermediate layer produced at the welding interface. The welding interface exhibited characteristic wavy morphology as well as similar- and dissimilar-metal joints. The intermediate layer was produced along the wavy interface. TEM observation and electron diffraction pattern analysis revealed that the intermediate layer was not monolithic but had a multi-phase structure. A part of the layer consisted of the extremely fine grains and amorphous phase particles. The other part of the layer was composed of the stacked extremely thin amorphous layers. STEM-EDS analysis found that the chemical composition of the amorphous phase in the intermediate layer was not constant and was different from that of the metallic glass matrix.