Interfacial reaction of intermetallic compounds of ultrasonic-assisted brazed joints between dissimilar alloys of Ti 6Al 4V and Al 4Cu 1Mg

Abstract

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.

Processing, microstructure and properties of ultrasonically processed in situ MgO–Al2O3–MgAl2O4 dispersed magnesium alloy composites

“…Thus, it can be concluded that magnesium nitrate acts as an oxygen source for the formation of stable oxides like MgO, MgAl 2 O 4 and Al 2 O 3 in the AZ91 MMCs. The beneficial effect of power ultrasound in improving the kinetics of chemical reactions aided by accelerated diffusion of atomic species is well documented [23,24]. Application high power ultrasonic vibrations to the melt in the present work must have favourably influenced the reaction kinetics.…”

Enhancing the Properties of Ti6Al4V as a Biomedical Material: A Review

“…Ultrasonic brazing using zinc filler material was done with dissimilar materials Ti 6 Al 4 V and Al 4 Cu 1 Mg in the absence and presence of silicon [73]. To regulate the formation of intermetallic compounds, pretreatment by hot dip aluminizing and as well as ultrasonic dipping was carried out, the latter being done in a molten filler bath.…”

Design of Laser Welding Parameters for Joining Ti Grade 2 and AW 5754 Aluminium Alloys Using Numerical Simulation

“…Modeling and numerical simulation of welding processes have been exploited with many advantages for investigation of physical principles and complex phenomena connected with joining processes [8][9][10][11][12][13]. Together with testing and inspection, numerical simulations are mutually important to understand and predict the performance of the welding processes.…”