Results are provided for a study of the structure and mechanical properties of alloy AK12 modified with tabletted ultra-finely dispersed modifier based on silicon carbide, introduced “beneath a metal stream” without additional mixing, and in a rotary device. It is established that the optimum method for introducing modifier is that of “beneath a metal stream.” In this case the ultimate breaking strength increases from 110 to 150 MPa, nominal yield strength from 85 to 94 MPa, and relative elongation from 2.3 to 6.2% (metal pouring temperature into a mold 750 °C). Metallographic examination is used to determine the reduction in macro-grain size in test pigs (ingots) by a factor of four compared with control alloys, absence of porosity, and an increase in ingot density from 2.59 to 2.66 g/cm3. Introduction of ultra-finely dispersed modifier based on silicon carbide increases the number of crystallization centers in a 1 kg ingot to 2·1011 units.
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Translated from Metallurg, Vol. 62, No. 5, pp. 67–70, May, 2018.
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Illarionov, I.E., Bogdanova, T.A., Gil’manshina, T.R. et al. Technology for Modifying Aluminum Alloys with Ultrafine Silicon. Metallurgist 62, 476–481 (2018). https://doi.org/10.1007/s11015-018-0684-0
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DOI: https://doi.org/10.1007/s11015-018-0684-0