Technical Article

Metallography, Microstructure, and Analysis

, Volume 1, Issue 1, pp 7-13

Three Dimensional (3D) Microstructural Characterization and Quantitative Analysis of Solidified Microstructures in Magnesium-Based Alloys

  • M. Y. WangAffiliated withDepartment of Mechanical Engineering, Tsinghua UniversityMaterials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University
  • , J. J. WilliamsAffiliated withMaterials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University
  • , L. JiangAffiliated withMaterials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University
  • , F. De CarloAffiliated withAdvanced Photon Source, Argonne National Laboratory
  • , T. JingAffiliated withDepartment of Mechanical Engineering, Tsinghua University
  • , N. ChawlaAffiliated withMaterials Science and Engineering, School for Engineering of Matter, Transport, and Energy, Arizona State University Email author 

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. In this study, 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 intermetallics and α-Mg matrix phase were obtained. The phase fractions of β-Mg17Al12 and Al–Mn intermetallics are 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 sixfold 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