Transient Liquid Phase Diffusion Bonding of Magnesium Alloy (Mg-AZ31) to Titanium Alloy (Ti-6Al-4V)
Date
2013-12-11
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Abstract
The magnesium alloy Mg-AZ31 and titanium alloy Ti-6Al-4V have physical characteristics and
mechanical properties that makes it attractive for a wide range of engineering applications in the
aerospace and automotive industries. However, the differences in melting temperature and
coefficient of thermal expansion hinder the use of traditional fusion welding techniques.
Transient liquid phase (TLP) bonding of magnesium alloy Mg-AZ31 and titanium alloy Ti-6Al-
4V was performed and different interlayer types and configurations were used to facilitate joint
formation. The joining of these alloys using Ni foils was successful at a bonding temperature of
515oC, bonding pressure 0.2 MPa, for bonding time of 5 minutes. At the Ni/Mg-AZ31 bond
interface, the formation of a eutectic liquid between Mg and Ni was observed. The formation of
Mg2Ni and Mg3AlNi2 were identified along the bond interface resulting in an isothermally
solidified joint. At the Ni/Ti-6Al-4V interface, the solid-state diffusion process results in joint
formation.
The use of double Ni-Cu sandwich joint resulted in further enhancement in joint formation and
this produced joints with greater shear strength values. The configuration of Mg-AZ31/Cu-
Ni/Ti-6Al-4V or Mg-AZ31/Ni-Cu/Ti-6Al-4V influence the mechanism of bonding and the type
of intermetallics formed within the joint. The application of thin Ni electrodeposited coatings
resulted in further enhancements of joint quality due to better surface-to-surface contact and a
reduction in the formation of intermetallics at the joint.
The effect of Cu nano-particles in the coatings was found to decrease the eutectic zone width and
this resulted in an increase the shear strength of the joints. The highest shear strength of 69 MPa
was possible with bonds made using coatings containing Cu nano-particle dispersion.
Description
Keywords
Engineering--Industrial, Materials Science, Engineering--Mechanical
Citation
Atieh, A. M. (2013). Transient Liquid Phase Diffusion Bonding of Magnesium Alloy (Mg-AZ31) to Titanium Alloy (Ti-6Al-4V) (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/28511