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|Title:||Phase-Field Simulations of Rapid Solidification in Binary Alloys|
|Keywords:||phase-field simulation, Rapid solidification, Binary alloys, solute trapping, four-fold dendritic|
|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>|
|Appears in Collections:||Digitized Open Access Dissertations and Theses|
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|Fan_Jun_2005Aug_Masters..pdf||6.04 MB||Adobe PDF||View/Open|
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