Interphase boundary segregation of Zn in Mg-Sn-Zn alloys

被引：94
作者：
Liu, Chaoqiang [1 ]
Chen, Houwen [1 ]
Nie, Jian-Feng [1 ,2 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
来源：
SCRIPTA MATERIALIA | 2016年 / 123卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloys; Precipitates; Interface segregation; HAADF-STEM; EDS-STEM; AGE-HARDENING RESPONSE; AL-CU; SOLUTE SEGREGATION; MAGNESIUM ALLOYS; OMEGA PHASE; SI ALLOY; EVOLUTION; PRECIPITATION; TEMPERATURE; INTERFACES;
D O I：
10.1016/j.scriptamat.2016.05.035
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Additions of Zn can significantly improve the age-hardening response of binary Mg-Sn alloys by refining the distribution of Mg2Sn precipitates, but its role in the precipitation is still unclear. In this study, the Mg2Sn precipitates with different morphologies and orientations in a Mg-9.8Sn-1.2Zn (wt.%) alloy are characterized by high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and STEM X-ray mapping. It is found that Zn atoms invariably segregate to the Mg2Sn-Mg interface, irrespective of the interfacial structures and orientation relationships of Mg2Sn. This finding provides insight to the understanding of the enhanced nucleation of Mg2Sn precipitates in Mg-Sn-Zn alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：5 / 8
页数：4
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