Dendritic Growth in Mg-Based Alloys: Phase-Field Simulations and Experimental Verification by X-ray Synchrotron Tomography
Dendritic Growth in Mg-Based Alloys: Phase-Field Simulations and Experimental Verification by X-ray Synchrotron Tomography
复制标题
DOI：
10.1007/s11661-014-2200-x
复制
发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
Mingyue Wang;Yan-Jin Xu;Q. Zheng;Sujun Wu;T. Jing;N. Chawla
中科院分区：
文献类型：
--
作者：
Mingyue Wang;Yan-Jin Xu;Q. Zheng;Sujun Wu;T. Jing;N. Chawla
在凝固过程中多晶枝晶生长模式的变化导致各种凝固枝晶结构和形貌。这些微观结构的变化是由各种各样的影响，如随机分布的成核位点和取向，生长的单个树枝状晶粒的相互作用，和固-液界面能各向异性的影响。在这里，我们已经研究了形成的复杂和多样的枝晶形态的实验，通过电子背散射衍射和X射线层析成像;和数值模拟的三维相场模拟。本文研究了三种二元镁合金：Mg-Al、Mg-Zn和Mg-Sn合金。我们发现，凝固组织可以归因于以下因素：生长的枝晶的相互作用，生长的各向异性，形核位置的分布和初始随机取向。
Changes in polycrystalline dendritic growth patterns during solidification result in a variety of solidified dendritic structures and morphologies. These microstructural changes are induced by a variety of effects such as the random distribution of nucleation sites and orientations, the interaction of growing individual dendritic grains, and effects of solid-liquid interfacial energy anisotropy. Here, we have studied the formation of the complicated and diverse dendrite morphologies both experimentally, by electron backscatter diffraction and by X-ray tomography; and numerically by three-dimensional phase-field simulations. Three binary magnesium alloys were considered in this study: Mg-Al, Mg-Zn, and Mg-Sn alloys. We show that the solidification microstructure can be attributed to the following factors: The interaction of the growing dendrites, the anisotropy of the growth, and the distribution and initial random orientations of nucleation sites.