Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments.
Interaction of local solidification and remelting during dendrite coarsening - modeling and comparison with experiments.
复制标题
枝晶粗化过程中局部凝固和重熔的相互作用 - 建模和与实验的比较
DOI：
10.1038/s41598-017-17857-2
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发表时间：
2017-12-19
影响因子：
4.6
通讯作者：
Zhu M
中科院分区：
文献类型：
--
作者：
Zhang Q;Fang H;Xue H;Pan S;Rettenmayr M;Zhu M
采用包含凝固和熔化机制的定量元胞自动机(CA)模型，模拟了等温保温过程中枝晶粗化的微观组织演变过程。本模型涵盖了热力学和动力学的基本方面，特别是成分、温度和曲率的演变/影响，从而有效地模拟了同时凝固和熔化。对SCN-0.3wt.%Ac合金由于温度梯度区熔化而在糊状区迁移的液池的CA模拟与分析预测进行了比较，从而验证了模型的有效性。应用该模型模拟了SCN-2.0wt.%Ac合金在糊状区等温保温过程中柱状枝晶的组织演变。在其他相同的条件下，将模拟结果与不包括熔化机理的先前CA模型的结果进行了比较。量化了熔化对枝晶粗化的作用，揭示了熔化对枝晶粗化过程的影响。本模型有效地再现了文献报道的实验中观察到的典型的树枝晶粗化特征。模拟揭示了局部凝固和熔化是如何通过相变、界面形状变化和溶质扩散之间复杂的相互作用而相互促进的。
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.
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影响因子：
9.4
作者：
Liotti, E.;Lui, A.;Grant, P. S.
通讯作者：
Grant, P. S.
DOI：
10.1016/s0921-5093(97)00720-x
发表时间：
1998-06-01
影响因子：
6.4
作者：
Chen, M;Kattamis, TZ
通讯作者：
Kattamis, TZ
影响因子：
9.4
作者：
Farup, I;Drezet, JM;Rappaz, M
通讯作者：
Rappaz, M
影响因子：
9.4
作者：
Pan, Shiyan;Zhu, Mingfang
通讯作者：
Zhu, Mingfang
影响因子：
9.4
作者：
Limodin, N.;Salvo, L.;Madi, K.
通讯作者：
Madi, K.