期刊
ACTA MATERIALIA
卷 59, 期 19, 页码 7287-7299出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.08.011
关键词
Magnesium alloys; Scanning/transmission electron microscopy; Crystal structure; Order-disorder structure
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [22656156, 23360306]
- International Center for Integrated Research and Advanced Education in Materials Science, Japan
- Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [23656429, 23246122, 22656156, 23360306] Funding Source: KAKEN
The crystal structure of a long period stacking-ordered (LPSO) phase newly found in the Mg-Al-Gd ternary system has been investigated by scanning transmission and transmission electron microscopy. The LPSO phase in the Mg-Al-Gd system is found to form by stacking structural blocks, each of which consists of six close-packed atomic planes. In each of the structural blocks long-range ordering occurs for the constituent Mg, Al and Gd atoms, with enrichment of Gd atoms occurring in four consecutive planes of the six close-packed atomic planes. The ideal chemical composition of the structural block is determined to be Mg29Al3Gd4 (Mg-8.3 at.% Al-11.1 at.% Gd). However, the stacking of structural blocks is largely disordered. Strictly speaking, the technical term LPSO cannot be used to describe this phase because of the long-range ordering of the constituent atoms in each structural block. The crystal structure of the LPSO phase can thus be crystallographically described as one of the order-disorder structures, and either the C2/m, P3(1)12 or P3(2)12 space group is assigned when the simplest stacking of structural blocks is assumed. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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