Abstract
Abstract The joining of an aluminium matrix composite to a titanium alloy by ultrasonic-assisted brazing using a Zn-based filler metal was investigated. An approximately 50-nm-thick amorphous Zn–Mg–Si interfacial layer formed between the Zn-based filler metal and SiC particles adjacent to the Ti alloy side of the brazed joint. Many of the Zn crystals that formed during brazing nucleated in this amorphous layer, suggesting that the amorphous layer acted as a diffusion layer between the Zn-based filler metal and SiC ceramic during brazing. This work not only explains the improvement in the performance of the brazing joints by the ultrasonic action but also proposes a strategy to optimise the interfacial structure for other metallic alloys.
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