Please use this identifier to cite or link to this item:
http://hdl.handle.net/11375/21841
Title: | Phase-Field Simulations of Rapid Solidification in Binary Alloys |
Authors: | Fan, Jun |
Advisor: | Provatas, Nikolas |
Department: | Materials Science |
Keywords: | phase-field simulation, Rapid solidification, Binary alloys, solute trapping, four-fold dendritic |
Publication Date: | Aug-2005 |
Abstract: | <p>Rapid solidification is a well established method to produce novel materials with improved mechanical or electrical properties. The sharp-interface kinetics of rapid solidification for a binary alloy is summarized. A Phase Field model mapping to this sharp interface model is summarized and solved by a new adaptive mesh refinement algorithm. Simulation results are consistent with experiments: The solidification velocity increases in power-law like fashion at low undercooling and approximately linearly at high undercooling; The solid/liquid interface undergoes a transition from four-fold dendritic to circular crystal structures; Solute trapping emerges and the solute partitioning approaches unity as the solidification velocity increases. Our Phase Field simulations are the first self -consistent predictions of velocity selection and morphological selection at both low and high undercoolings and also the first independent check of the solute trapping model in two dimensions.</p> |
URI: | http://hdl.handle.net/11375/21841 |
Appears in Collections: | Digitized Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Fan_Jun_2005Aug_Masters..pdf | 6.04 MB | Adobe PDF | View/Open |
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