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Modeling of Dendrite Growth for Mg Alloy with Compact Hexagonal Crystal Structure |
Zhiyong LIU;; |
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Cite this article:
Zhiyong LIU. Modeling of Dendrite Growth for Mg Alloy with Compact Hexagonal Crystal Structure. Acta Metall Sin, 2007, 43(4): 367-373 .
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Abstract Magnesium alloy is getting more and more worldwide application. Therefore, microstructure simulation of Mg alloy during solidification process not only has important academic value, but also can meet the active demand for development of industry. Based on the crystallographic structure and preferential growth direction of Mg alloy, physical model of grain growth for compact hexagonal structure was founded and a new stochastic simulation method named virtual core growth calculation model was proposed in this paper. Considering dendrite growth kinetics, anisotropy of grain growth and secondary dendrite arm coarsening, the present model adopted dendrite shape functions to reveal the evolution of primary and secondary dendrite arms. A coordinate transformation technique was introduced to calculate the cell capture of growing dendrites with arbitrary orientations rapidly and accurately. Coupled with the calculation of microscopic solute concentration, the simulation can get more accurate growth morphology of dendrites and solute distribution. Finally, applications to the Mg-Al based alloys are presented describing directional as well as equiaxed dendritic growth, which indicated the high theoretic and practical value of proposed models.
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Received: 23 August 2006
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