Journal article
Determining material parameters using phase-field simulations and experiments
A method to determine material parameters by comparing the evolution of experimentally determined 3D microstructures to simulated 3D microstructures is proposed. The temporal evolution of a dendritic solid-liquid mixture is acquired in situ using x-ray tomography. Using a time step from these data as an initial condition in a phase-field simulation, the computed structure is compared to that measured experimentally at a later time.
An optimization technique is used to find the material parameters that yield the best match of the simulated microstructure to the measured microstructure in a global manner. The proposed method is used to determine the liquid diffusion coefficient in an isothermal Al-Cu alloy. However, the method developed is broadly applicable to other experiments in which the evolution of the three-dimensional microstructure is determined in situ.
We also discuss methods to describe the local variation of the best-fit parameters and the fidelity of the fitting. We find a liquid diffusion coefficient that is different from that measured using directional solidification.
Language: | English |
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Year: | 2017 |
Pages: | 229-238 |
ISSN: | 18732453 and 13596454 |
Types: | Journal article |
DOI: | 10.1016/j.actamat.2017.02.056 |
ORCIDs: | Zhang, Jin and Poulsen, Henning Friis |