Three-Dimensional Shapes and Distributions of Long-Period Stacking Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Gd<sub>2</sub> Cast Alloys Characterized by Electron Tomography

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  • Three-Dimensional Shapes and Distributions of Long-Period Stacking Ordered Structures in Mg₉₇Zn₁Gd₂ Cast Alloys Characterized by Electron Tomography

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Abstract

Three-dimensional (3D) configurations of 14H long-period stacking ordered (LPSO) structures formed in Mg97Zn1Gd2 cast alloys at intermediate stages of the formation process have been studied by single tilt-axis electron tomography using high-angle annular dark-field scanning transmission electron microscopy. Lateral morphology of the 14H LPSO is clearly visualized by reconstructing 3D volumes. An existence of “dent-shaped” area was found in a 3D reconstructed volume for the first time. The edge of LPSO shows a characteristic triangular shape with an angle of 60°, which indicates that the growth front is parallel to {11\bar{2}0}Mg. It is suggested that in-plane irregular or characteristic shapes are related to the lateral growth mechanism of LPSO. Electron tomography has proven to be an indispensable tool to characterize in-plane structural information of LPSO formed in α-Mg matrix.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 56 (7), 928-932, 2015

    The Japan Institute of Metals and Materials

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