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Year 2019 Volume 17, Issue 4 |
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Issues/2019/vol. 17 /Issue 4 |
V. I. Dubodelov, V. Ye. Panarin, A. V. Narivskyy, V. O. Seredenko, V. M. Fikssen, O. V. Seredenko
«Influence of the Plasma Component on Structure Forming of Pre-Eutectic Silumin in Magnetohydrodynamic Mixing Fusion»
773–782 (2019)
PACS numbers: 47.65.-d, 52.75.Fk, 61.25.Mv, 68.70.+w, 81.30.Fb, 83.60.Np, 83.80.Gv
Physicotechnological Institute of Metals and Alloys of the National Academy of Sciences of Ukraine developed the technology of mixing the melt by magnetohydrodynamic method (MHD) with the addition of gas plasma into the bulk of metal. The effect of MHD mixing and gas plasma on the structure and composition of the pre-eutectic silumin is investigated in this paper. As shown, the action of the plasma on melt during 5 minutes leads to the fragmentation of primary crystals of a solid solution based on the aluminium (\(\alpha\)-Al), to reducing size of large eutectic grains with the colonial structure of flat silicon crystals and to partial degeneration of the eutectic. The degeneration is manifested in the fact that, instead of the cooperative growth of eutectic colonies, the independent growth of the components of eutectics comes, with aluminium crystallizing on the primary \(\alpha\)-Al crystals as on the substrate, and silicon in the form of independently emerging and growing dispersed crystals of boll shape. This form of eutectic silicon crystals is preferable with regard to the flat form, since it does not cause local stresses on the interfacial boundary with \(\alpha\)-Al. After stopping the plasma, after ? 5 minutes, the alloy aspires to return to the original structure with large primary \(\alpha\)-Al crystals and a colonial eutectic with flat silicon crystals. The short-term effects of the plasma are compared with the modification of the melt with elements, which increase the wetting by liquid of the primary \(\alpha\)-Al crystals, but it is not long-term in time.
Keywords: MHD mixing, silumin, plasma, structure dispersion
https://doi.org/10.15407/nnn.17.04.773
References
1. G. F. Shemetev, Alyuminievyye Splavy: Sostavy, Svoistva, Primenenie: Uchebnoye Posobie po Kursu "Proizvodstvo Otlivok iz Splavov Tsvetnykh metallov" (Ehlektronnyy Resurs) (Saint Petersburg: 2012), Ch. I (in Russian). 2. V. I. Dubodelov and M. S. Goryuk, XVII Mezhdunarodnyy Promyshlennyy Forum ‘Oborudovanie i Instrument’ (20–23 November 2018, Kyiv, Ukraine) (in Russian).
3. G. K. Smolin and E. D. Shabaldin, Materialy ² Mezhdunarodnoy NauchnoPrakticheskoy Konferentsii (Perm’: Izdatel’stvo Permskogo Natsionalnogo Issledovatel’skogo Universiteta: 2015), p. 216 (in Russian).
4. V. I. Dubodielov, M. S. Horyuk, Nauka pro Materialy: Dosyahnennya ta Perspektyvy (Natsionalna Akademiya Nauk Ukrainy. Viddilennya FizykoTekhnichnykh Problem Materialoznavstva) (Kyiv: Akademperiodyka: 2018), vol. 2, p. 24 (in Ukrainian).
5. V. L. Naydek and A. V. Narivskiy, Povyshenie Kachestva Otlivok iz Alyuminievykh i Mednykh Splavov Plazmoreagentnoy Obrabotkoy Ikh Rasplava (Kyiv: Naukova Dumka: 2008) (in Russian).
6. Yu. N. Taran and V. I. Mazur, Struktura Ehvtekticheskikh Splavov (Moscow: Metallurgiya: 1978) (in Russian).
7. Yu. P. Skorobagat’ko, Metall i Lit’yo Ukrainy, 9: 19 (2009) (in Russian).
 This article is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License © NANOSISTEMI, NANOMATERIALI, NANOTEHNOLOGII G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 2019 E-mail: tatar@imp.kiev.ua Phones and address of the editorial office About the collection User agreement |