Place: The 14th International IUPAC Conference on High Temperature Materials Chemistry, University of Science and Technology, Bejing, China
Alvin Noe Ladines
High temperature applications need materials with excellent thermo-physical and mechanical properties which should be part of the pre-production design in order to assure energy sustainability including processing and use. Examples of such materials are steels and Ni-/Co-base superalloys. In these systems the topologically close-packed (TCP) phases play a role as both, stable and metastable phases. We created a thermodynamic database using the as-calculated density functional theory (DFT) configurational energies  of formation for several TCP forming systems in combination with a CALPHAD format  in order to calculate stable and metastable phase diagrams.
The results of multiphase equilibria calculated using a Gibbs energy minimiser, like driving forces for precipitation, volumes, heat-capacities (considering only Bragg-Williams-Gorsky configuration entropy), etc, can be exported to processing and aging like microstructure simulations and creep.
Here, we present phase diagrams for fcc, bcc, and hcp families of structures including the TCP phases A15, C14, C15, C36, σ, μ and χ.
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Supporting information:fries_suzana (2).pdf