State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, People's Republic of China.
Ultrason Sonochem. 2011 Sep;18(5):1062-7. doi: 10.1016/j.ultsonch.2011.03.025. Epub 2011 Apr 3.
Ultrasonic-assisted brazing of Al4Cu1Mg and Ti6Al4V using Zn-based filler metal (without and with Si) has been investigated. Before brazing, the Ti6Al4V samples were pre-treated by hot-dip aluminizing and ultrasonic dipping in a molten filler metal bath in order to control the formation of intermetallic compounds between the Ti6Al4V samples and the filler metal. The results show that the TiAl(3) phase was formed in the interface between the Ti6Al4V substrate and the aluminized coating. For the Zn-based filler metal without Si, the Ti6Al4V interfacial area of the brazed joint did not change under the effect of the ultrasonic wave, and only consisted of the TiAl(3) phase. For the Zn-based filler metal with Si, the TiAl(3) phase disappeared and a Ti(7)Al(5)Si(12) phase was formed at the interfacial area of the brazed joints under the effect of the ultrasonic wave. Due to the TiAl(3) phase completely changing to a Ti(7)Al(5)Si(12) phase, the morphology of the intermetallic compounds changed from a block-like shape into a lamellar-like structure. The highest shear strength of 138MPa was obtained from the brazed joint free of the block-like TiAl(3) phase.
采用锌基填充金属（无硅和含硅）对 Al4Cu1Mg 和 Ti6Al4V 进行了超声辅助钎焊。钎焊前，通过热浸镀铝和在熔融填充金属浴中超声浸渍对 Ti6Al4V 样品进行预处理，以控制 Ti6Al4V 样品和填充金属之间形成金属间化合物。结果表明，Ti6Al4V 基体与镀铝层之间形成了 TiAl(3)相。对于不含硅的锌基填充金属，钎焊接头的 Ti6Al4V 界面区域在超声波的作用下没有变化，仅由 TiAl(3)相组成。对于含硅的锌基填充金属，在超声波的作用下，TiAl(3)相消失，在钎焊接头的界面区域形成了 Ti(7)Al(5)Si(12)相。由于 TiAl(3)相完全转变为 Ti(7)Al(5)Si(12)相，金属间化合物的形态从块状变为层状结构。在没有块状 TiAl(3)相的钎焊接头中获得了 138MPa 的最高剪切强度。
