Abstract
Abstract The novel Al-Si-Zn filler metals containing Ti and Sr were used for brazing of 6061 aluminum alloy. The results indicate that the addition of Zn into the Al-Si filler metal lowers the solidus temperature from 583 °C to around 520 °C. The minor addition of modification element Sr and refine element Ti into Al-Si-Zn alloy WILL cause the remarkable modification of Al-Si eutectic and the α-Al phase is also refined. The main phases in the filler metals as well as the brazed seams are α-Al, η-Zn, and Si phases. The large clusters of Al-Si eutectic in the Al-Si-Zn-Sr-0.04Ti brazed seam are refined by further adding 0.08 wt% Ti, the refined Al-Si eutectic is homogeneously distributed among α-Al phase. Diffusion layers can be found in the brazed interface, the Mn-Fe phase is also found in the brazed seam due to the diffusion of 6061 base metal into the brazing alloy which is helpful for reduce the formation of acicular β-Fe.
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