Three-Dimensional Imaging of a Long-Period Stacking Ordered Phase in Mg97Zn1Gd2 Using High-Voltage Electron Microscopy

Kazuhisa Sato; Shunya Tashiro; Yohei Yamaguchi; Takanori Kiguchi; Toyohiko J. Konno; Tomokazu Yamamoto; Kazuhiro Yasuda; Syo Matsumura

doi:10.2320/matertrans.M2016021

Three-Dimensional Imaging of a Long-Period Stacking Ordered Phase in Mg₉₇Zn₁Gd₂ Using High-Voltage Electron Microscopy

Kazuhisa Sato, Shunya Tashiro, Yohei Yamaguchi, Takanori Kiguchi, Toyohiko J. Konno, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura

Author information

Kazuhisa Sato
Institute for Materials Research, Tohoku University
Present Address: Research Center for Ultra-High Voltage Electron Microscopy, Osaka University
Shunya Tashiro
Depertment of Materials Science, Tohoku University
Yohei Yamaguchi
Depertment of Materials Science, Tohoku University
Takanori Kiguchi
Institute for Materials Research, Tohoku University
Toyohiko J. Konno
Institute for Materials Research, Tohoku University
Tomokazu Yamamoto
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University
Kazuhiro Yasuda
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University
Syo Matsumura
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University

Keywords: high-voltage electron microscopy (HVEM), long-period stacking order (LPSO), magnesium-zinc-gadolinium, electron tomography, lateral growth, scanning transmission electron microscopy (STEM)

JOURNAL FREE ACCESS

2016 Volume 57 Issue 6 Pages 918-921

DOI https://doi.org/10.2320/matertrans.M2016021

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Abstract

Spatial configurations and lateral morphology of the 14H long-period stacking ordered (LPSO) phase have been studied by single tilt-axis electron tomography using high-voltage scanning transmission electron microscopy (STEM) operated at 1 MV. A “Quonset hut-like” lateral shape of the LPSO was found in a tomogram of a specimen as thick as 1.7 μm. The reconstructed volume reveals spatial distribution of residual particulate precipitates of (Mg, Zn)₃Gd phase 20–30 nm in diameters. The precipitates act as a source of solute elements for the formation and growth processes of 14H LPSO. 1 MV-STEM realizes enough resolution for imaging the morphology of LPSO as well as high electron transmittance (~4.1 μm) without any obvious electron irradiation damages on microstructures.

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