Abstract
CALPHAD uncertainty quantification (UQ) is the foundation of materials design with quantified confidence. We report a framework and software packages to enable CALPHAD UQ assessment and calculation using commercial CALPHAD software (Thermo-Calc). This Bayesian inference framework is coupled with a Markov chain Monte Carlo algorithm to establish uncertainty traces with a given thermodynamic database file (TDB) and corresponding experimental data points. This general framework is demonstrated with the Ni–Cr binary system. The algorithm is firstly validated on synthetic data with known ground truth. Then it is applied to real experimental data to generate posterior traces. We develop a file format named TDBX, which provides a single source of truth by combining the original TDB content and the traces for each assessed Gibbs energy parameter. CALPHAD UQ calculations are performed based on the TDBX file, from which uncertainties for phase boundaries, enthalpy curves, and solidification range are collected as examples of basic design parameters. This TDBX file with corresponding scripts are made open-source. The combination of CALPHAD UQ assessments and calculations connected by TDBX supports uncertainty-assisted modeling, enabling the integrated application of modern design with uncertainty methodologies to computational materials design.
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Acknowledgements
The work reported in this manuscript was made possible through support from the Office of Science of the US Department of Energy under SBIR Award DE-SC0017234. C.N. would like to acknowledge insightful conversations with Dr. Marius Stan and group members of the Uncertainty Quantification of Phase Equilibria and Thermodynamics (UQPET) group of the NIST-sponsored Center for Hierarchical Materials Design (CHiMaD). C.N. would also like to acknowledge Dr. Johan Jeppsson from Thermo-Calc Software for his help on TC-Python usage.
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This work is supported by DOE SBIR Award DE-SC0017234.
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Lin, Y., Saboo, A., Frey, R. et al. CALPHAD Uncertainty Quantification and TDBX. JOM 73, 116–125 (2021). https://doi.org/10.1007/s11837-020-04405-z
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DOI: https://doi.org/10.1007/s11837-020-04405-z