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Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments
The microstructural evolution of dendrite coarsening during isothermal holding is simulated using a quantitative cellular automaton (CA) model involving the mechanisms of both solidification and melting. The present model encompasses the essential aspects of thermodynamics and kinetics, particularly...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5736763/ https://www.ncbi.nlm.nih.gov/pubmed/29259208 http://dx.doi.org/10.1038/s41598-017-17857-2 |
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author | Zhang, Qingyu Fang, Hui Xue, Hua Pan, Shiyan Rettenmayr, Markus Zhu, Mingfang |
author_facet | Zhang, Qingyu Fang, Hui Xue, Hua Pan, Shiyan Rettenmayr, Markus Zhu, Mingfang |
author_sort | Zhang, Qingyu |
collection | PubMed |
description | The microstructural evolution of dendrite coarsening during isothermal holding is simulated using a quantitative cellular automaton (CA) model involving the mechanisms of both solidification and melting. The present model encompasses the essential aspects of thermodynamics and kinetics, particularly the evolution/influence of composition, temperature, and curvature, leading to valid simulations of simultaneous solidification and melting. Model validation is performed through a comparison of the CA simulations with analytical predictions for a liquid pool migrating in the mushy zone of a SCN–0.3 wt.% ACE alloy due to temperature gradient zone melting. The model is applied to simulate the microstructural evolution of columnar dendrites of a SCN–2.0 wt.% ACE alloy during isothermal holding in a mushy zone. The simulation results are compared with those of a previous CA model that does not include the melting mechanism under otherwise identical conditions. The role of melting for dendrite coarsening is quantified, showing how the melting influences the coarsening process. The present model effectively reproduces the typical dendrite coarsening features as observed in experiments reported in the literature. The simulations reveal how local solidification and melting stimulate each other through the complicated interactions between phase transformation, interface shape variation, and solute diffusion. |
format | Online Article Text |
id | pubmed-5736763 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-57367632017-12-21 Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments Zhang, Qingyu Fang, Hui Xue, Hua Pan, Shiyan Rettenmayr, Markus Zhu, Mingfang Sci Rep Article The microstructural evolution of dendrite coarsening during isothermal holding is simulated using a quantitative cellular automaton (CA) model involving the mechanisms of both solidification and melting. The present model encompasses the essential aspects of thermodynamics and kinetics, particularly the evolution/influence of composition, temperature, and curvature, leading to valid simulations of simultaneous solidification and melting. Model validation is performed through a comparison of the CA simulations with analytical predictions for a liquid pool migrating in the mushy zone of a SCN–0.3 wt.% ACE alloy due to temperature gradient zone melting. The model is applied to simulate the microstructural evolution of columnar dendrites of a SCN–2.0 wt.% ACE alloy during isothermal holding in a mushy zone. The simulation results are compared with those of a previous CA model that does not include the melting mechanism under otherwise identical conditions. The role of melting for dendrite coarsening is quantified, showing how the melting influences the coarsening process. The present model effectively reproduces the typical dendrite coarsening features as observed in experiments reported in the literature. The simulations reveal how local solidification and melting stimulate each other through the complicated interactions between phase transformation, interface shape variation, and solute diffusion. Nature Publishing Group UK 2017-12-19 /pmc/articles/PMC5736763/ /pubmed/29259208 http://dx.doi.org/10.1038/s41598-017-17857-2 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Zhang, Qingyu Fang, Hui Xue, Hua Pan, Shiyan Rettenmayr, Markus Zhu, Mingfang Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title | Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title_full | Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title_fullStr | Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title_full_unstemmed | Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title_short | Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
title_sort | interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5736763/ https://www.ncbi.nlm.nih.gov/pubmed/29259208 http://dx.doi.org/10.1038/s41598-017-17857-2 |
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