Effect of annealing time on microstructure and properties of BAg45CuZn brazing filler metal

doi:10.13251/j.issn.0254-6051.2020.02.035

Abstract

Abstract:

Influence of annealing time on the microstructure and properties of the brazing filler metal BAg45CuZn commonly used in refrigeration and tools industries was analyzed. The results show that the main phases of BAg45CuZn alloy are Cu solid solution, Ag solid solution, Ag-Zn and Cu-Zn compounds. Annealing at 580 ℃ for different time, the main phases of the BAg45CuZn alloy keep unchanged, while the proportion and morphology of each phase are changed, especially the eutectic structure which changes from fine to coarse with the prolongation of holding time. The hardness of Cu-Zn and Ag-Zn compounds in the eutectic structure is higher, which leads to the increase of microhardness and brittleness, as well as poorer processability of the whole matrix. The flowability and the tensile strength of the filler metal annealed at 580 ℃ for different annealing time have significant changes.

Key words: silver-based filler metals, annealing time, brazing properties, microstructure

CLC Number:

TG156.2

Zhang Guanxing, Xue Hangyan, Sun Huawei, Huang Junlan, Dong Hongwei. Effect of annealing time on microstructure and properties of BAg45CuZn brazing filler metal[J]. HTM, 2020, 45(2): 186-188.

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