Three-dimensional shapes and distributions of long-period stacking ordered structures in Mg97Zn1Gd2 cast alloys characterized by electron tomography

Kazuhisa Sato, Shuhei Matsunaga, Shunya Tashiro, Yohei Yamaguchi, Takanori Kiguchi, Toyohiko J. Konno

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 {112¯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.

Original languageEnglish
Pages (from-to)928-932
Number of pages5
JournalMaterials Transactions
Volume56
Issue number7
DOIs
Publication statusPublished - 2015

Keywords

  • Electron tomography
  • Lateral growth
  • Lateral morphology
  • Long-period stacking ordered (LPSO)
  • Magnesium-zinc-gadolinium
  • Scanning transmission electron microscopy (STEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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