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Susceptibility of Mg–REM–Zn–Zr Magnesium Alloys to Casting Unsoundness

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Abstract

The production of various housings of the units operating under the pressure of liquids or gases requires the use of alloys with increased soundness after casting. We compare the properties of the magnesium alloys most widely used for producing leakproof castings, namely, ML10, Elektron 21, EZ33A, ZE41A, and ZE63A. For each of them, the equilibrium and nonequilibrium freezing ranges, the heat of solidification, and the fraction of eutectic in a structure are calculated, and the dynamics of the change in the rate of solidification of an alloy in the freezing range is estimated. The shape and size of shrinkage cavity in castings made of the alloys are also determined, and the shrinkage porosity of the castings was measured. The causes for the low soundness of the ML10 alloy castings are considered. The contribution of the eutectic phase content and the freezing range wideness of an alloy to the formation of a soundness casting wall is shown to be decisive. The precipitation of a sufficient amount of eutectic in the cast structure of a magnesium alloy ensures high soundness even in the presence of shrinkage porosity in a casting. The best tightness among the alloys is demonstrated by the EZ33A and Elektron 21 alloys, which have a sufficient amount of eutectic and a short freezing range.

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Funding

This research received financial support from the Ministry of Science and Higher Education in the Russian Federation (Agreement no. 075-11-2019-045 from November 22, 2019) under the program “Scientific and technological development of the Russian Federation” according to governmental decree no. 218 dated April 9, 2010.

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Authors and Affiliations

  1. National University of Science and Technology MISiS, Moscow, Russia

    A. V. Koltygin, V. E. Bazhenov, I. V. Plisetskaya, Yu. V. Tselovalnik, A. I. Bazlov & V. D. Belov

  2. Rubin Aviation Corporation (JSC AC “Rubin”), Balashikha, Russia

    V. A. Yudin

Authors
  1. A. V. Koltygin
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  2. V. E. Bazhenov
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  3. I. V. Plisetskaya
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  4. Yu. V. Tselovalnik
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  5. A. I. Bazlov
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  6. V. D. Belov
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  7. V. A. Yudin
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Corresponding authors

Correspondence to A. V. Koltygin, V. E. Bazhenov, I. V. Plisetskaya, Yu. V. Tselovalnik, A. I. Bazlov, V. D. Belov or V. A. Yudin.

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Translated by K. Shakhlevich

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Koltygin, A.V., Bazhenov, V.E., Plisetskaya, I.V. et al. Susceptibility of Mg–REM–Zn–Zr Magnesium Alloys to Casting Unsoundness. Russ. Metall. 2021, 821–829 (2021). https://doi.org/10.1134/S0036029521070053

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  • DOI: https://doi.org/10.1134/S0036029521070053

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