Abstract
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.
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Acknowledgments
MYW and TJ acknowledge financial support from the National Science Foundation of China, under Grant No. 51175292, Doctoral Fund of Ministry of Education of China, under Grant No. 20090002110031, and National Science and Technology Major Project of China, under Grant No. 2011ZX04014-052. MYW also gratefully acknowledges the use of X-ray synchrotron beam line BL13W1 at the Shanghai Synchrotron Radiation Facility (SSRF) and the Chinese Scholarship Council for financial support during his stay at ASU.
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Manuscript submitted October 1, 2013.
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Wang, M., Xu, Y., Zheng, Q. et al. Dendritic Growth in Mg-Based Alloys: Phase-Field Simulations and Experimental Verification by X-ray Synchrotron Tomography. Metall Mater Trans A 45, 2562–2574 (2014). https://doi.org/10.1007/s11661-014-2200-x
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DOI: https://doi.org/10.1007/s11661-014-2200-x