Abstract
The work is aimed at establishing the effect of nanosecond electromagnetic pulses (NEPs) with different amplitudes on the formation of the structure of cast aluminum matrix composites of the pseudo-binary Al–Mg2Si system with hypoeutectic (5 wt % Mg2Si) and hypereutectic (15 wt % Mg2Si) composition. With an increase in the amplitude of the generator of NEPs in alloys with 5 and 15 wt % Mg2Si, the structural components of the matrix alloy (α-solid solution and eutectic) are refined, while no significant differences in the sizes and morphology of primary crystals of Mg2Si in the hypereutectic range of compositions were observed in the entire range of tested variants of the amplitude of the generator of NEPs. Presumably, the observed nature of the influence of NEPs on the structure of composites in the hypereutectic region of compositions is associated with the features of their crystallization behavior. The temperature range of the existence of the two-phase region L + Mg2Si is much lower than the temperatures of irradiation with NEPs; apparently, in connection with this, NEPs do not affect the thermodynamic state of the interfaces “primary crystal Mg2Si–melt.” It has been shown that a promising option for the simultaneous modifying effect on all structural components of Al–Mg2Si aluminum matrix composites (solid solution, eutectic, primary Mg2Si particles) is a combination of thermal-rate treatment and irradiation of melts with NEPs, as well as additional processing of melts by NEPs during solidification.
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This study was supported by a grant from the Russian Science Foundation (project no. 20-19-00687).
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Deev, V.B., Ri, E.K., Prusov, E.S. et al. Influence of Parameters of Melt Processing by Nanosecond Electromagnetic Pulses on the Structure Formation of Cast Aluminum Matrix Composites. Russ. J. Non-ferrous Metals 63, 392–399 (2022). https://doi.org/10.3103/S1067821222040058
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DOI: https://doi.org/10.3103/S1067821222040058