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Effect of bonding time on microstructure and mechanical properties of transient liquid phase bonded magnesium AZ31 alloy
Highlights ► Novel method of joining AZ31 magnesium alloy. ► Microstructural changes within the joint optimized with bonding parameters. ► Reaction zone characterized and related to changes in mechanical properties of the joint.
Abstract The transient liquid phase (TLP) bonding of a magnesium alloy AZ31 was undertaken using pure nickel interlayers. The formation of a eutectic between the magnesium and nickel was obtained by bonding at 515°C and the microstructural developments across the joint region were examined as a function of hold time from 5 to 120min. Reaction zones were identified within the joint and the changes of width of the reaction zones were examined with respect to changes in the joint shear strength and hardness. The results showed that as the bonding time was increased to 60min, the width of the eutectic zone was completely removed and the joint solidified isothermally. Under these conditions a maximum hardness value of 179VHN was recorded and the highest joint shear strength of 36MPa was obtained. However, when the bonding time was increased to 120min, the shear strength of the interface decreased and this was attributed to the formation and segregation of brittle Mg–Ni intermetallics within the joint.
Effect of bonding time on microstructure and mechanical properties of transient liquid phase bonded magnesium AZ31 alloy
Highlights ► Novel method of joining AZ31 magnesium alloy. ► Microstructural changes within the joint optimized with bonding parameters. ► Reaction zone characterized and related to changes in mechanical properties of the joint.
Abstract The transient liquid phase (TLP) bonding of a magnesium alloy AZ31 was undertaken using pure nickel interlayers. The formation of a eutectic between the magnesium and nickel was obtained by bonding at 515°C and the microstructural developments across the joint region were examined as a function of hold time from 5 to 120min. Reaction zones were identified within the joint and the changes of width of the reaction zones were examined with respect to changes in the joint shear strength and hardness. The results showed that as the bonding time was increased to 60min, the width of the eutectic zone was completely removed and the joint solidified isothermally. Under these conditions a maximum hardness value of 179VHN was recorded and the highest joint shear strength of 36MPa was obtained. However, when the bonding time was increased to 120min, the shear strength of the interface decreased and this was attributed to the formation and segregation of brittle Mg–Ni intermetallics within the joint.
Effect of bonding time on microstructure and mechanical properties of transient liquid phase bonded magnesium AZ31 alloy
Jin, Y.J. (author) / Khan, T.I. (author)
2012-01-20
6 pages
Article (Journal)
Electronic Resource
English
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