Synthesis of the metastable Al3Mg phase in Mg–Al–C system by mechanical alloying.

Autor: Rud, Alexander D., Kirian, Inna M., Lakhnik, Andrey M., Kotko, Andrii V., Rud, Nickolay D.
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Zdroj: Applied Nanoscience; Mar2022, Vol. 12 Issue 3, p741-746, 6p
Abstrakt: This paper reports the metastable Al3Mg β″-phase of L12 structural type which was prepared by mechanical alloying in the planetary mill under the argon gas atmosphere. The Al3Mg phase formation during mechanical alloying of aluminum and magnesium initial powders in a stoichiometric ratio of 3:1 with the addition of 5 wt.% graphite, structural parameters, and morphology of the synthesized β″-phase, which is isostructural to the aluminum matrix with the fcc-lattice of 0.4058 nm parameter, is studied by X-ray diffraction and TEM electron microscopy methods. The effect of graphite on the formation of the metastable intermetallic Al3Mg phase was studied. It was found that the graphite suppresses the powder agglomeration and promotes the formation of the metastable β″-phase in the Al–Mg system. From X-ray data, it has been found that after 12 h, mechanical alloying of powder mixtures with additive graphite was synthesized composite containing two phases: Al3Mg metastable intermetallic compound—79.2 wt% and Al(Mg) solid solution—20.8 wt%. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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