Journal
PHYSICS OF METALS AND METALLOGRAPHY
Volume 122, Issue 6, Pages 572-578Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0031918X2106003X
Keywords
mechanochemical synthesis; iron oxide; aluminum; hercynite; iron-aluminum intermetallic compounds
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Funding
- Belarus Republic Foundation for Basic Research [T20P-037]
- Russian Foundation for Basic Research [20-53-00037]
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The products of the mechanochemical reduction of iron oxide with aluminum were studied using X-ray diffraction analysis, infrared, and Mossbauer spectroscopy. The results showed that the products contain iron, alpha-Al2O3, and a large amount of spinel (hercynite), and the reduction of iron oxide proceeds faster with a twofold increase in the aluminum content. Excess aluminum reacts with the reduced iron to form intermetallic FexAly phases, mainly FeAl strengthened by alpha-Al2O3 particles.
The products of the mechanochemical reduction of iron oxide with aluminum have been studied by means of X-ray diffraction analysis, infrared and Mossbauer spectroscopy. It is shown that the products of the mechanochemical reaction at a stoichiometric ratio of iron oxide and aluminum contain iron, alpha-Al2O3, and a large amount of spinel (hercynite), which slightly decreases with an increase in the time of mechanical activation. According to the Mossbauer spectroscopy data, the reduction of iron oxide proceeds faster with a twofold increase in the aluminum content as compared to the stoichiometric one, and the excess aluminum reacts with the reduced iron, forming intermetallic FexAly phases mainly the monoaluminide FeAl strengthened by alpha-Al2O3 particles. Upon a threefold excess of the aluminum content over the stoichiometric one, the mechanochemical reduction slows down and the amount of FexAly intermetallic compounds with a higher aluminum content increases in the final products of reaction.
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