About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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AI/Data Informatics: Applications and Uncertainty Quantification at Atomistics and Mesoscales
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Presentation Title |
Uncertainty Quantification in Computational Thermodynamics - From the Atomistic to the Continuum Scale |
Author(s) |
Noah H. Paulson, Joshua Gabriel, Thien C Duong, Marius Stan |
On-Site Speaker (Planned) |
Noah H. Paulson |
Abstract Scope |
The design of materials requires comprehensive descriptions of the thermodynamic properties of materials and their constituents. The CALculation of PHase Diagrams (CALPHAD) approach leverages measured and calculated thermodynamic properties and phase stabilities to calibrate mathematical thermodynamic descriptions and provide critical predictive capabilities. In practice, uncertainties are present in the thermodynamic descriptions and resulting predictions as a result of the distribution of calibration data and differences in error between data sources. We describe several approaches, developed at Argonne National Laboratory, that provide thermodynamic information to CALPHAD through atomistic calculations and machine learning that consider the multiple origins of uncertainty and the propagation to higher length-scale predictions. Specifically, we explore uncertainty of enthalpy and specific heat derived from Density Functional Theory (DFT) including an efficient k-nearest-neighbors based acceleration scheme and machine learned interatomic potentials, and Bayesian methods to automatically weight thermodynamic datasets used in the calibration of CALPHAD models. |
Proceedings Inclusion? |
Planned: |