Equal-Strength Precision Diffusion Bonding Of Aa6063 Aluminum Alloy With The Surface Passivated By A Self-Assembled Monolayer
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH(2017)
Abstract
Precision diffusion bonding of aluminum alloy requires good mechanical properties and very low deformation. However, oxidation lowers the quality of the joint. This paper used a self-assembled monolayer, 1-hexyl mercaptan, on the aluminum surface to prevent the secondary oxidation after pre-bonding treatment. An AA6063/Ni/AA6063 sandwich structure joint was intentionally designed and bonded to characterize the effect of the self-assembled monolayer. AA6063/AA6063 joints were diffusion bonded, in which three different pre-bonding surface treatments were used that were as-cleaned, ethanol adsorbed and self-assembled monolayer passivated. With the surface passivated by selfassembled monolayer, there were few voids at the bonding interface. Ductile fracture was observed during tensile testing. The joint had a bond ratio of 97.4% and elongation of 20.4%, which is very close to the base metal and is considered as equal-strength bonding.
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Key words
AA6063,Self-assembled monolayer,Precision diffusion bonding,Equal-strength bonding
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