Journal
ULTRASONICS SONOCHEMISTRY
Volume 18, Issue 5, Pages 1062-1067Publisher
ELSEVIER
DOI: 10.1016/j.ultsonch.2011.03.025
Keywords
Ultrasonic dipping; Intermetallic compounds; Ultrasonic-assisted brazing; Interfacial reaction
Categories
Funding
- National Natural Science Foundation of China [51075104]
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Ultrasonic-assisted brazing of Al-4Cu-1Mg and Ti-6Al-4V using Zn-based filler metal (without and with Si) has been investigated. Before brazing, the Ti-6Al-4V 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 Ti-6Al-4V samples and the filler metal. The results show that the TiAl3 phase was formed in the interface between the Ti-6Al-4V substrate and the aluminized coating. For the Zn-based filler metal without Si, the Ti-6Al-4V interfacial area of the brazed joint did not change under the effect of the ultrasonic wave, and only consisted of the TiAl3 phase. For the Zn-based filler metal with Si, the TiAl3 phase disappeared and a Ti7Al5Si12 phase was formed at the interfacial area of the brazed joints under the effect of the ultrasonic wave. Due to the TiAl3 phase completely changing to a Ti7Al5Si12 phase, the morphology of the intermetallic compounds changed from a block-like shape into a lamellar-like structure. The highest shear strength of 138 MPa was obtained from the brazed joint free of the block-like TiAl3 phase. (C) 2011 Elsevier B.V. All rights reserved.
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