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• W4313332692 abstract "In this paper, we investigate prenucleation and heterogeneous nucleation in the liquid Pb/solid Al system as an example of systems with large lattice misfit using molecular dynamics simulation. Solid Pb and Al have a large positive lattice misfit (f) of 18.2% along the densely packed [110] direction. This study reveals that prenucleation occurs at 600 K (an undercooling of 15 K), and a 2-dimensional (2D) ordered structure forms at the interface with a coincidence site lattice (CSL) between the first Pb and first Al layers. The CSL accommodates the major part of the f, and only a small residual lattice misfit (fr) of 1.9% remains. The formation of the CSL transforms the original substrate into a considerably potent nucleant, where the first Pb layer becomes the new surface layer of the substrate. At an undercooling of about 22 K, nucleation proceeds by merging 2D ordered structure through structural templating: the second Pb layer is epitaxial to the CSL Pb layer, the third Pb layer largely accommodates the fr, and the fourth Pb layer is a nearly perfect crystalline plane. Further analysis indicates that the interface with the CSL has a lower interfacial energy than with a cube-to-cube orientation relationship. For the first time, we established that the CSL was an effective mechanism to accommodate the f for systems with a large positive misfits. Heterogeneous nucleation is governed not by a single mechanism (misfit dislocations in Turnbull's model), but instead by various mechanisms depending on f. This study sheds new light on the atomistic mechanism of heterogeneous nucleation." @default.
• W4313332692 created "2023-01-06" @default.
• W4313332692 creator A5008301999 @default.
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• W4313332692 date "2023-01-17" @default.
• W4313332692 modified "2023-10-16" @default.
• W4313332692 title "A study on prenucleation and heterogeneous nucleation in liquid Pb on solid Al using molecular dynamics simulations" @default.
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• W4313332692 doi "https://doi.org/10.1063/5.0134154" @default.
• W4313332692 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36681631" @default.
• W4313332692 hasPublicationYear "2023" @default.
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