Aluminum–magnesium alloy powders with magnesium contents ranging from 5% to 50 wt % were prepared by close-coupled gas atomization in order to study the influence of the magnesium-rich phase on oxidation of alloy powders. The phase composition, morphology, and oxidation process of the alloy powders were studied by x-ray diffraction, scanning electron microscope/energy-dispersive x-ray, and thermogravimetric/differential thermal analysis, respectively. The results showed that the complete oxidation temperature decreased with the increase of magnesium content, and the selective oxidation of the magnesium-rich phase occurred in the oxidation processes of the alloy powders. Furthermore, different exothermic peaks corresponded to oxidation of different phases. For alloy powders with low magnesium content, the exothermic peaks occurred above 1000°C, corresponding to the oxidation of residual aluminum; whereas for alloy powders with high magnesium content, the exothermic peaks occurring at about 570°C were associated with the oxidation of Al12Mg17 and the exothermic peaks occurring at about 750°C were concerned with the oxidation of the nanoflake aluminum-rich phase. The magnesium-rich phase and nanoflake aluminum-rich phase were responsible for the excellent thermal performance of the gas-atomized aluminum–magnesium alloy powders.
Effect of Magnesium-Rich Phase on Oxidation Properties of Atomized Aluminum–Magnesium Powders
Journal of propulsion and power ; 32 , 1
2016
Article (Journal)
English
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