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Thermal diffusion coupled quantitative phase-field simulations with large undercooling
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DOI：10.1016/j.mechmat.2022.104298.png)
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The numerical solution of phase-field model depends on the input interface-width particularly when the undercooling is high. In order to make the computation feasible, the interface is required to be thick, but such choice of interface-width renders the numerical solution inaccurate. In the present work, we investigate the effect of interface-width on phase-field computation with thermal diffusion under high undercooling. We show that the accuracy of phase-field computation is actually related to the interfacial-energy. A numerical strategy based on mobility-correction is formulated and applied to the transformation of gamma -> alpha-iron under various conditions. We also numerically solve the moving-boundary model based on the sharp interface and compare it with the phase-field computations to assess its accuracy. It has been observed that convergence of the phase-field computations to sharp-interface based predictions is remarkably good with the proposed computational strategy over a wide ranges of input interface widths and undercoolings.
Keyword:
Phase-field model
Kinetic undercooling
Iron
期刊
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4.1
论文数:
4.0K
被引数:
1.2W
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