Access count of this item: 428

Files in This Item:
File Description SizeFormat 
j.intermet.2012.06.010.pdf2.59 MBAdobe PDFView/Open
Title: The crystal structure of the LPSO phase of the 14H-type in the Mg–Al–Gd alloy system
Authors: Kishida, K.  kyouindb  KAKEN_id  orcid (unconfirmed)
Yokobayashi, H.
Inui, H.  kyouindb  KAKEN_id
Yamasaki, M.
Kawamura, Y.
Author's alias: 岸田, 恭輔
Keywords: A. intermetallics, miscellaneous
B. Crystallography
F. Electron microscopy, transmission
Issue Date: Dec-2012
Publisher: Elsevier Ltd.
Journal title: Intermetallics
Volume: 31
Start page: 55
End page: 64
Abstract: The crystal structure of a long-period stacking-ordered (LPSO) phase of the 14H-type formed in a Mg–Al–Gd alloy as a local small part in the intergrowth structure together with that of the 18R-type (the majority) has been investigated by scanning transmission and transmission electron microscopy. The LPSO phase of the 14H-type in the Mg–Al–Gd system is found to form by stacking structural blocks, each of which consists of seven close-packed atomic planes. In each of the structural blocks, a long-range ordering occurs for the constituent Mg, Al and Gd atoms with the enrichment of Gd atoms in the four consecutive atomic planes. The in-plane long-range ordering in the four consecutive atomic planes occurs so as to form Al6Gd8 clusters in a periodic manner. This is exactly the same as what is observed in the LPSO phase of the 18R-type. The crystal structure of the 14H-type LPSO phase can thus be described to form simply by adding a Mg layer to the crystal structure of the 18R-type LPSO phase so as to form triple (three consecutive) Mg layers to sandwich the Gd-enriched quadruple layers. The ideal chemical formula of the structural block is Mg35Al3Gd4 (Mg – 7.1 at.%Al – 9.5 at.%Gd). The crystal structure of the LPSO phase can thus be crystallographically described as one of the order–disorder (OD) structures, and the space group of either P6322 or R3C, is assigned when the simplest stacking of structural blocks is assumed.
Rights: © 2012 Elsevier Ltd.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.intermet.2012.06.010
Appears in Collections:Journal Articles

Show full item record

Export to RefWorks

Export Format: 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.