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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Magnesium Alloy Development: An LMD Symposium in Honor of Karl Kainer
Presentation Title Thermodynamics of Phase Formation in Mg–Al–C Alloys Applied to Grain Refinement
Author(s) Guillaume Deffrennes, Bruno Gardiola, Marc Lomello, Jérôme Andrieux, Olivier Dezellus, Rainer Schmid-Fetzer
On-Site Speaker (Planned) Guillaume Deffrennes
Abstract Scope Grain refinement of Mg-Al based alloys is challenging because it is known that Zr, which is extremely effective in many Al-free alloys, cannot be used. The addition of carbon through various routes by using carbon-containing sources is considered as an option. The grain refinement mechanisms are still under debate. The present work is focused on the ternary base system Mg-Al-C, including the potential nucleants Al4C3 and Al2MgC2, presently without consideration of Al2CO. Phase formation in the Mg-Al-C system will be discussed and a tentative ternary phase diagram is presented. It is based on a Mg-Al-C thermodynamic description providing the thermodynamic stabilities of Al4C3 and Al2MgC2 and driving forces for their formation in the ternary system. This description is validated by ternary key experiments and also includes the experimentally validated Mg-C phase diagram. Quantitative calculation of the segregation effect and growth restriction factor are also provided.
Proceedings Inclusion? Planned:


Alloy Design for the Development Heat Treatable Mg Sheet Alloy with Excellent Room Temperature Formability and Strength
Biodegradable Mg-Y and Mg-Li Alloys with the Addition of Ca and Zn to the Medical Application
Co-precipitation on the Basal and Prismatic Planes in Mg-Gd-Ag-Zr Alloy Subjected to Over-ageing
Corroding Magnesium Implants – a New Class of Biomaterials
Creep Resistant Mg-Mn Based Alloys for Automotive Powertrain Applications
Degradable Magnesium Implants - Assessment of the Current Situation
Development and Characterization of Mg-4Zn-0.5Ca-0.16 Mn (wt. %) Alloy for Biomedical Applications
Development of Heat-treatable High-strength Mg–Zn–Ca–Zr Sheet Alloy with Excellent Room Temperature Formability
Development of Magnesium-Rare Earth Die-casting Alloys
Development of Magnesium Sheets
Development of Ultralight and Ultrafine Grained Mg-4Li-1Ca Alloy for Biomedical and Lightweight Applications
Effect of Al Addition on the Microstructure and Compressive Properties of Mg-based AZ31 Alloy
Effects of Severe Plastic Deformation on Mechanical Properties and Corrosion Behavior of Magnesium Alloys
Effects of Sn Addition on Microstructure and Impression Creep Behavior of ZC63 Magnesium Alloy
Enhancing Impact Toughness of Mg-3%Al-1%Zn Alloy by Grain Structure Modification
Evolution of the Dislocation Structure during Compression in a Mg-Zn-Y Alloy with Long Period Stacking Ordered Structure
Interaction between Propagating Twins and Non-shearable Precipitates in Magnesium Alloys
Intermetallic Phase Characteristics in the Mg-Nd-Zn System
Magnesium Nanocomposites, Progress and Potential
Magnesium Pistons in Engines: Fiction or Fact?
Metal Injection Molding (MIM) of Mg-alloys
Microstructure Evolution and Mechanical Properties of Thin Strip Twin Roll Cast (TRC) Mg Sheet
Orientation and Length Scale Effect in Deformation Mechanism in Pure Magnesium
Precipitate Strengthening Mechanisms in Different Mg Alloys by In Situ Synchrotron X-ray Diffraction
Recent Developments in the Application of the Interdependence Model of Grain Formation and Refinement
Solidification Analysis of Grain Refined AZ91D Magnesium Alloy via Neutron Diffraction
Solutions for Next Generation Automotive Lightweight Concepts Based on Material Selection and Functional Integration
Study on Mg-Si-Sr Ternary Alloys for Biomedical Applications
The Effect of Shearable Plate-shaped Precipitates on the Strength of Mg Alloys
Thermodynamics of Phase Formation in Mg–Al–C Alloys Applied to Grain Refinement

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