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The brazeability of AZ31B–H24 magnesium alloy sheet to Zn electroplated, plain carbon steel sheet using an Mg–Al–Zn alloy filler metal and a diode laser heat source has been investigated. While the Zn coating promoted good wetting between the molten filler alloy and the steel sheet, it did not play a direct role in forming the final bond. Bonding between the magnesium alloy and the steel was facilitated by the formation of two transition layers. First, a nanoscale layer of FeAl 3 phase formed on the surface of the steel by diffusion of Al from the Mg–Al–Zn brazing alloy into the steel. Upon further cooling, nucleation and growth of either α-Mg+MgZn eutectic phases or Mg 2 (Al,Zn) 3 phase occurred on the FeAl 3 surface layer.
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Nasiri et al. (2014) studied this question.
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