MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Three-Dimensional Imaging of a Long-Period Stacking Ordered Phase in Mg97Zn1Gd2 Using High-Voltage Electron Microscopy
Kazuhisa SatoShunya TashiroYohei YamaguchiTakanori KiguchiToyohiko J. KonnoTomokazu YamamotoKazuhiro YasudaSyo Matsumura
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2016 Volume 57 Issue 6 Pages 918-921

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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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© 2016 The Japan Institute of Metals and Materials
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