FEATURES OF CRYSTALLIZATION AND EVOLUTION OF THE STRUCTURE OF THE IRON-CONTAINING PHASES OF AK5M2 ALLOY PROCESSING BY PULSED ELECTRIC CURRENT IN LIQUID STATE
Processy litʹâ, 2019, Tom 136, №4, p.20-34
Keywords:
iron-containing phase, morphology, phase transformations, mechanical properties, unipolar pulsed electric currentAbstract
Received 30.05.2019
UDK 669.11/. 15: 542.65:621.3.015
In this work, we investigated the structure formation of the AK5M2 (А319) hypoeutectic alloy after passing the unipolar pulsed electric current through the melt. It is shown that the treatment of the melt with electric current leads to a change in the nature of phase transformations during crystallization, the formation of eutectics, which instead of the iron containing needle-like β-FeSiAl5 phase contains a branched α-(Fe,Mn,Cu)3Si2Al15 intermetallic phase. The dependence of the morphology of the iron-containing phases on the parameters of treatment with electric current and their relationship with mechanical properties is established. The crystallographic structure of the intermetallic α-(Fe,Mn,Cu)3Si2Al15 phase formed by eutectic reactions of liquid disintegration involving a solid solution of aluminum and silicon, is determined. Theoretical calculations have shown that the structural changes in the melt that occur during the passage of electric current are associated with the phenomenon of electric transfer, the redistribution of the atoms of the components between the disordered zone and the clusters. This leads to a change in the composition and short-range order of atoms in iron-containing clusters, a change in the structure and morphology of ironcontaining phases during crystallization, which causes an increase in the mechanical properties of the secondary alloy AK5M2 to the level of analogs smelted from primary metals.
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Copyright (c) 2019 А. Г. Пригунова, Г. М. Зелінська*, М. В. Кошелєв
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