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Phase Diagram of Al-Ca-Mg-Si System and Its Application for the Design of Aluminum Alloys with High Magnesium Content

1
Department of Metal Forming, National University of Science and Technology MISiS, 4 Leninsky pr., 119049 Moscow, Russia
2
Institution of Russian Academy of Sciences A.A. Baikov Institute of Metallurgy and Material Science RAS, 49 Leninsky pr., 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Metals 2017, 7(10), 429; https://doi.org/10.3390/met7100429
Received: 28 August 2017 / Revised: 29 September 2017 / Accepted: 9 October 2017 / Published: 13 October 2017
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Abstract

The phase transformations in the Al-Ca-Mg-Si system have been studied using thermodynamic calculations and experimental methods. We show that at 10% Magnesium (Mg), depending on the concentrations of calcium (Ca) and silicon (Si), the following phases crystallize first (apart from the aluminum (Al) solid solution): Al4Ca, Mg2Si, and Al2CaSi2. We have found that the major part of the calculated concentration range is covered by the region of the primary crystallization of the Al2CaSi2 phase. Regardless of the Ca and Si content, the solidification of the aluminum-magnesium alloys ends with the following nonvariant eutectic reaction: L → (Al) + Al4Ca + Mg2Si + Al3Mg2. With respect to the temperature and composition of the liquid phase, this reaction is close to the eutectic reaction in the Al-Mg binary system. The addition of Ca and Si to the Al-10% Mg base alloy increases its hardness, reduces its density, and has no negative influence on its corrosion resistance. We have also established that the near-eutectic alloy containing about 3% Ca and 1% Si has the optimum structure. View Full-Text
Keywords: metals and alloys; phase diagrams; phase transitions; microstructure; eutectic; solidification; Al-Ca-Mg-Si system; aluminum-magnesium alloys metals and alloys; phase diagrams; phase transitions; microstructure; eutectic; solidification; Al-Ca-Mg-Si system; aluminum-magnesium alloys
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Belov, N.A.; Naumova, E.A.; Akopyan, T.K.; Doroshenko, V.V. Phase Diagram of Al-Ca-Mg-Si System and Its Application for the Design of Aluminum Alloys with High Magnesium Content. Metals 2017, 7, 429.

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