Numerical simulation of wave-like nucleation events

Joint 5th International Conference on Advances in Solidification Processes;5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining

土木建筑工程;计算机科学

Yuan, Lang^1 ; Prasad, Arvind^2 ; Lee, Peter D^3 ; Stjohn, David^2

Department of Mechanical Engineering, University of South Carolina, Columbia

SC

29201, United States^1

Centre for Advanced Materials Processing and Manufacturing, University of Queensland, St Lucia

QLD

4072, Australia^2

Department of Mechanical Engineering, Univesity College London, London

WC1E 6BT, United Kingdom^3

关键词: Constitutional supercooling;    Dendritic growth;    Diffusion controlled;    Nucleation zone;    Solidification behaviour;    Solidification modeling;    Synchrotron studies;    Synchrotron x rays;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/529/1/012043/pdf
DOI  :  10.1088/1757-899X/529/1/012043

来源: IOP

【 摘 要 】

The Interdependence model [1] predicted that nucleation would occur in waves of events with regions of no nucleation in between each wave. The waves continue to form until nucleation covers the sample. The cause of this phenomenon was attributed to the formation of a nucleation-free zone which incorporates solute suppressed nucleation and inhibited nucleation zones. Recent real-time synchrotron x-ray studies by Prasad et al [2], Liotti et al [3] and Xu et al [4] have confirmed this hypothesis showing nucleation occurs in a step-wise fashion with a number of events occurring followed by little or no nucleation for a short period before another set of events occurs. A microscale solidification model that predicts diffusion-controlled dendritic growth has successfully shown the effect of the developing constitutional supercooling on the selection of nucleation events. In this study, we use this model to predict the solidification behaviour under the conditions experienced during these real-time synchrotron studies.