Coexistence of 14H and 18R-type long-period stacking ordered (LPSO) phases following a novel orientation relationship in a cast Mg-Al-RE-Zn alloy

被引：28
作者：
Yang, Qiang [1 ]
Guan, Kai [1 ,4 ]
Li, Baishun [1 ,4 ]
Meng, Fanzhi [2 ]
Lv, Shuhui [2 ]
Yu, Zijian [3 ]
Zhang, Xuhu [3 ]
Zhang, Jingqi [3 ]
Meng, Jian [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China
[2] Changchun Univ Sci & Technol, Sch Mat Sci & Engn, Changchun 130022, Jilin, Peoples R China
[3] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 766卷
基金：
中国国家自然科学基金;
关键词：
Transmission electron microscopy (TEM); Long-period stacking ordered (LPSO) phase; Magnesium alloys; Precipitation; Orientation relationship; DYNAMIC RECRYSTALLIZATION BEHAVIOR; BUILDING-BLOCK; CRYSTAL-STRUCTURE; GD; 18R; TRANSFORMATIONS; EVOLUTION; MAGNESIUM; ZR;
D O I：
10.1016/j.jallcom.2018.07.053
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：
Coexistence of 14H and 18R-type long-period stacking ordered (LPSO) phases was observed in a cast Mg-Al-RE-Zn alloy, following a novel orientation relationship of (0001)(14H) about 70.5 degrees from (001)(18R) and [1 (1) over bar 00](14H)//[100](18R). Transmission electron microscopy (TEM) observations reveal that this novel structure was formed because of the concurrence of the precipitation of 18R structure in the lumpy Mg4.8Al12RE7.2 phase and the heterogeneous nucleation of 14H structure on the coherent Mg/Mg4.8Al12RE7.2 interface during isothermal heat treatment at 300 degrees C. This paper gives an in depth understanding of the new formation mechanisms of the coexistence of both 14H and 18R-type LPSO phases. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：902 / 907
页数：6
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