Abstract In this article, environmental friendly BAg25Cu40Zn34Sn (BAg-25) and BAg30Cu37Zn32Sn (BAg-30) flux-core solder metal capable of facilitating automatic production of brazing manufacturing processes were prepared. The butt and lap induction brazing tests were carried out on the substrate with BAg-25 and BAg-30. Wettability, microstructure and mechanical properties of the solders on the base metal were studied by field emission scanning electron microscope (SEM-EDS), electron backscattering diffraction (EBSD), tensile testing machine and microhardness tester. Results indicated that the wetting property of BAg-30 with 30% silver content was better than that of BAg-25 with 25% silver content. At the same time, besides copper and silver-based solid solutions, the brazed joint of BAg-30 solder also contain Cu + Ag eutectic phase. In the brazed joint of BAg-25 solder, the grain size is smaller, which makes the tensile strength and the shear strength of the joints better. Therefore, the BAg-25 flux-core solder metal will further reduce the industrial cost and meet the requirements of mechanical properties.

中文翻译：

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银基复合钎料钎焊接头的组织和力学性能

摘要 本文制备了可促进钎焊制造工艺自动化生产的环保型BAg25Cu40Zn34Sn (BAg-25) 和BAg30Cu37Zn32Sn (BAg-30) 药芯焊料金属。对接和搭接感应钎焊测试在具有 BAg-25 和 BAg-30 的基材上进行。采用场发射扫描电子显微镜(SEM-EDS)、电子背散射衍射(EBSD)、拉伸试验机和显微硬度计研究了焊料在母材上的润湿性、微观结构和力学性能。结果表明，银含量为30%的BAg-30的润湿性能优于银含量为25%的BAg-25。同时，BAg-30焊料的钎焊接头除了铜基和银基固溶体外，还含有Cu+Ag共晶相。在BAg-25焊料的钎焊接头中，晶粒尺寸更小，这使得接头的抗拉强度和剪切强度更好。因此，BAg-25药芯焊锡金属将进一步降低工业成本，满足机械性能要求。