Grain growth in four dimensions: A comparison between simulation and experiment
Grain growth in four dimensions: A comparison between simulation and experiment
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DOI：
10.1016/j.actamat.2014.06.028
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发表时间：
2014-10-01
期刊：
影响因子：
9.4
通讯作者：
Voorhees, P. W.
中科院分区：
文献类型：
--
作者：
McKenna, I. M.;Poulsen, S. O.;Voorhees, P. W.
3-D 各向同性相场模拟用于预测晶粒生长过程中单个晶粒的形态。该模拟采用通过 X 射线断层扫描实验表征的钛合金 Ti-beta-21S 多晶阵列作为初始条件。 X 射线断层扫描的非破坏性特性允许在热处理引起的粗化后对同一样品进行第二次表征。因此，可以对模拟和实验之间的单个颗粒进行直接比较。尽管从统计的角度来看，实验系统呈现出各向同性，但对单个晶粒的直接检查揭示了局部尺度上晶界的非常明显的各向异性。尽管晶粒在晶粒生长过程中可能经历复杂的拓扑变化，但实验和相场模拟之间的比较揭示了具有良好一致性的区域。因此，相场模型可以正确捕获实验中发生的拓扑转变序列。因此，我们得出结论，各向同性系统的相场模型已经通过实验验证。 (C) 2014 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
A 3-D isotropic phase field simulation was used to predict the morphology of individual grains during grain growth. The simulation employed a polycrystalline array of titanium alloy Ti-beta-21S experimentally characterized by X-ray tomography as an initial condition. The non-destructive nature of X-ray tomography allowed for a second characterization of the same sample following coarsening induced by a heat treatment. Thus, direct comparisons of individual grains between simulation and experiment could be made. Although the experimental system appeared isotropic from a statistical standpoint, direct examination of individual grains revealed very distinct anisotropy in the grain boundaries on the local scale. The comparison between experiment and phase-field simulations revealed regions with excellent agreement, despite the complex topological changes grains may undergo during grain growth. Thus, the sequence of topological transitions that occurred experimentally is correctly captured by the phase-field model. We therefore conclude that this phase-field model for isotropic systems has been verified experimentally. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.