Development and characterization of Al-Si-Cu-Zn-Sn brazing filler alloy using vacuum arc furnace

Abstract

Al-12Si filler alloy are used as brazing filler material for brazing titanium. In the present work, aluminium-based Al-12Si-xCu-0.5Zn-0.5Sn (wt %) (x = 0.5, 1, 1.5, 2) brazing filler alloys were developed using vacuum arc melting process. Structural characterization of the brazing filler alloy was done using XRD, Optical Microscopy and Differential Scanning Calorimetry (DSC). XRD results confirm the absence of intermetallic phases in the brazing filler alloy. Hardness measurement showed that hardness of alloy increases with increasing amount of Cu in the alloy with a maximum hardness of 86 HV. DSC analysis revealed a melting temperature of 570 ℃ of the Al-12Si-1Cu0.5Zn-0.5Sn alloy. Electrochemical behavior of the filler alloys were also studied.