Thermal stability of Al2MgC2 and thermodynamic modeling of the Al–C–Mg system - Application to grain refinement of Mg–Al alloys
| Autor: | Jérôme Andrieux, M. Lomello-Tafin, G. Deffrennes, Alain Pasturel, Olivier Dezellus, Rainer Schmid-Fetzer, Alexander Pisch, B. Gardiola |
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| Přispěvatelé: | Laboratoire des Multimatériaux et Interfaces (LMI), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Clausthal University of Technology (TU Clausthal) |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science General Chemical Engineering Alloy 0211 other engineering and technologies Thermodynamics [CHIM.MATE]Chemical Sciences/Material chemistry 02 engineering and technology General Chemistry Liquidus engineering.material 01 natural sciences Computer Science Applications Carbide [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry 0103 physical sciences engineering Thermal stability Graphite Solubility Ternary operation CALPHAD 021102 mining & metallurgy |
| Zdroj: | Calphad Calphad, Elsevier, 2019, 67, pp.101678. ⟨10.1016/j.calphad.2019.101678⟩ |
| ISSN: | 0364-5916 |
| DOI: | 10.1016/j.calphad.2019.101678 |
| Popis: | International audience; In the scope of supporting the development of Mg–Al alloys and related materials, an experimental study coupled with a CALPHAD thermodynamic modeling of the Al–C–Mg system was conducted. The peritectic decomposition of Al2MgC2 to form Al4C3, graphite and a liquid phase was measured at 1559 ± 10 K by DTA. In order to model the Mg solubility in Al4C3, DFT calculations were performed on the end-member phases Mg4C3, Al2Mg2C3 and Mg2Al2C3 and it was shown that Mg substitutes on the Al2 crystallographic site of the carbide structure. Based on recent literature data and a revised Al–C binary, a model description of the Al–C–Mg ternary is proposed for the first time. More specifically, it is used to calculate the liquidus projection and the phase formation sequence during Scheil solidification of a 91Mg–9Al wt% alloy inoculated with carbon. This work provides a convincing argument that Al2MgC2 is the nucleant responsible for the grain refinement of Mg–Al alloys inoculated by C. |
| Databáze: | OpenAIRE |
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