Abstract
Atomized aluminum powder was mixed to magnesium alloy (AZ31) machined chips to realize the final composition of Mg-12, 40 and 61.5 mol% Al. Then the powder mixtures were mechanically alloyed (MA) for 54 ks. For the surface improvements of the magnesium alloy, the obtained MA powders were stacked on magnesium alloy (AZ31B) rod as the substratum, and they were bonded by hot-compressive deformation at various temperatures. After the bonding of Mg-12 mol% Al MA powder to AZ31B substratum at 673 K over, Mg17Al12 phase precipitates from super-saturated α-Mg in the bonded alloy layer. The structure of the bonded Mg-40 mol% Al MA alloy layer changes from Mg17Al12 single phase to Mg17Al12 and Mg3Al2 double phases. In the case of Mg-61.5 mol% Al MA powder, the amorphous phase formed by MA crystallizes to Mg2Al3 and MgAl phases. The hardness in the MA alloy layer becomes to higher than as-MA powder particles after the bonding. If the MA powder bonds to AZ31 alloy substratum at high temperature by the compressive deformation, the gradient of Mg and Al concentrations forms in the bonding interface by diffusion phenomenon with low activation energy.
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