Study of three-dimensional morphology of α-Mg dendrite II: 3D experimental characterization

• 1、Department of Mechanical Engineering, Tsinghua University, Beijing 100084

Abstract：Magnesium alloys have the attractive combination of lightweight and strength. An understanding of solidification microstructures in these materials is important. An accurate means of quantifying microstructure in 3D is extremely important. Here we have used serial polishing and synchrotron-based X-ray tomography technique as a means of 3D characterization of the solidified microstructures of magnesium-based alloys. These models were also used to conduct quantitative analysis in 3D. The phase fraction and morphologies of α-Mg matrix phase were obtained. The phase fraction of β-Mg17Al12 is consistent with measurements in the literature and calculations based on the Scheil-Gulliver solidification model. Our 3D reconstructions also show that the dendrite morphology has six-fold symmetry. The results of 3D microstructural characterization and analysis will enable a comprehensive understanding of solidification variables, microstructure, and properties.

keywords： solidification magnesium alloys three-dimensional characterization synchrotron-based X-ray tomography serial sectioning

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