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Grain coarsening in two-dimensional phase-field models with an orientation field
Bálint Korbuly1, Tamás Pusztai1, Hervé Henry2
1Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Post Office Box 49, H-1525 Budapest, Hungary.
Contradictory results on grain size distribution in polycrystalline systems persist. Insufficient resolution of small angle grain boundaries in orientation field models leads to log-normal distributions, aligning with experimental findings.
Area of Science:
- Materials Science
- Physics
- Computational Modeling
Background:
- Conflicting reports exist on the limiting grain size distribution (LGSD) in 2D polycrystalline systems.
- Experimental and phase-field crystal (PFC) models suggest a log-normal LGSD.
- Conventional phase-field models (MPF, OF) have produced different distributions.
Purpose of the Study:
- To resolve discrepancies in reported LGSDs for polycrystalline systems.
- To investigate the impact of simulation resolution on LGSD.
- To identify the source of differing LGSD results in the literature.
Main Methods:
- Revisiting orientation field (OF) models.
- Analyzing the effect of small angle grain boundary resolution.
- Comparing simulation results with experimental and PFC data.
Main Results:
- Insufficient resolution of small angle grain boundaries in OF models yields a log-normal LGSD.
- This log-normal distribution matches experimental and PFC simulation results.
- LGSD is highly sensitive to the evaluation process and small angle grain boundary detection.
Conclusions:
- The discrepancies in LGSD findings may stem from variations in detecting small angle grain boundaries.
- Accurate resolution of grain boundaries is crucial for obtaining correct LGSD.
- OF models can reproduce experimental LGSD with adequate resolution.
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