A novel long-period stacking/order structure in Mg-Ni-Y alloys

被引：34

作者：

Yamashita, K. ^{[1
]}

Itoi, T. ^{[2
]}

Yamasaki, M. ^{[3
]}

Kawamura, Y. ^{[3
]}

Abe, E. ^{[1
,4
]}

机构：

[1] Univ Tokyo, Dept Mat Sci & Engn, Tokyo 1138656, Japan

[2] Chiba Univ, Dept Mech Engn, Chiba 2638522, Japan

[3] Kumamoto Univ, Magnesium Res Ctr, Kumamoto 2391, Japan

[4] Natl Inst Mat Sci, Res Ctr Struct Mat, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 788卷

关键词：

Magnesium alloys; Crystal structure; Long-period order; Electron microscopy; SUPERLATTICE PHASE; ORDERED STRUCTURE; GD; STRENGTH; 18R; 14H;

D O I：

10.1016/j.jallcom.2019.02.219

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have identified a novel long-period stacking/order (LPSO) phase in a Mg-Ni-Y alloy, which provides novel LPSO structural features regarding both the stacking/order aspects; the 12R-type stacking sequence and the in-plane modulation of approximately 7 x (1 (2) over bar 10)(hcp) with respect to the fundamental hexagonal-closed-packed Mg structure. The ideal 7M model for the present 12R-type LPSO phase is constructed based on the ordered arrangements of the L1(2)-type Ni6Y8 clusters embedded in the local ABCA stacking layers, resulting in the stoichiometry Mg77Ni9Y12 (Mg78.6Ni9.2Y12.2) that appears to be extremely close to the experimentally determined composition Mg78.4Ni9.0 +/- 0.2Y12.6 +/- 0.3 (at.%). This in turn suggests the robustness of the solute cluster with a specific ratio (Ni6Y8), emerging the pseudo-binary formation behaviors of the LPSO phase in the Mg ternary alloys. (c) 2019 Elsevier B.V. All rights reserved.

引用

页码：277 / 282

页数：6

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