Evolution of long-period stacking order (LPSO) in Mg₉₇Zn₁Gd₂ cast alloys viewed by HAADF-STEM multi-scale electron tomography

Sato, Kazuhisa; Tashiro, Shunya; Matsunaga, Shuhei et al.

Philosophical Magazine, 2018, 98(21), 1945-1960

Number of Access:507（2025-09-30 08:00 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/97375

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Title
Evolution of long-period stacking order (LPSO) in Mg₉₇Zn₁Gd₂ cast alloys viewed by HAADF-STEM multi-scale electron tomography
Creator
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
CreatorName
Tashiro, Shunya
CreatorName
Matsunaga, Shuhei
NRID
1000040448098 1000040448098
ORCID
0000-0001-6794-5939 0000-0001-6794-5939
researchmap permalink
read0140668 read0140668
Scopus Author ID
8638124400 8638124400
CreatorName
Yamaguchi, Yohei
NRID
1000070311660 1000070311660
CreatorName
Kiguchi, Takanori
NRID
1000090260447 1000090260447
CreatorName
Konno, Toyohiko J.
Subject
electron tomography
lateral morphology
Long-period stacking order (LPSO)
magnesium alloys
scanning transmission electron microscopy (STEM)
Description
This is an Accepted Manuscript an article published by Taylor & Francis in Philosophical Magazine on 23 July 2018, available at https://doi.org/10.1080/14786435.2018.1468940.
Abstract
We have studied three-dimensional (3D) structures and growth processes of 14H-type long-period stacking order (LPSO) formed in Mg₉₇Zn₁Gd₂ cast alloys by single tilt-axis electron tomography (ET) using high-angle annular dark-field scanning transmission electron microscopy. Evolution of the solute-enriched stacking faults (SFs) and the 14H LPSO by ageing were visualised in 3D with a high spatial resolution in multi-scale fields of views from a few nanometres to ~10 μm. Lateral growth of the solute-enriched SFs and the LPSO in the (0 0 0 1)ᴍ𝚐 plane is notable compared to the out-of-plane growth in the [0 0 0 1]ᴍ𝚐 direction. The 14H LPSO grows at the cost of decomposition of the (Mg, Zn)₃Gd-type precipitates, and accompany a change of in-plane edge angles from 30 to 60°. We have updated the Time–Temperature–Transformation diagram for precipitation in Mg₉₇Zn₁Gd₂ alloys: starting temperatures of both solute-enriched SFs and LPSO formation shifted to a shorter time side than those in the previous diagram.
Publisher
Taylor and Francis Ltd
Source Title
Philosophical Magazine
Volume (Issue)
98(21)
Page
1945-1960
Date of Issued
2018-07-23
Language
English
Handle URL
https://hdl.handle.net/11094/97375
PISSN
14786435
eISSN
14786443
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1080/14786435.2018.1468940
Access Rights
open access
CopyRight
© 2018 Informa UK Limited, trading as Taylor & Francis Group.
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article