Co-segregation of Mg and Zn atoms at the planar η1-precipitate/Al matrix interface in an aged Al-Zn-Mg alloy

被引：30
作者：
Cheng, Bingqing [1 ]
Zhao, Xiaojun [2 ]
Zhang, Yong [1 ]
Chen, Houwen [2 ]
Polmear, Ian [1 ]
Nie, Jian-Feng [1 ]
机构：
[1] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[2] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
来源：
SCRIPTA MATERIALIA | 2020年 / 185卷
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
Aluminium alloys; Interface segregation; Energy-Dispersive X-ray Spectroscopy; High-angle annular dark field; Deep neural network based calculation and simulation; INTERPHASE BOUNDARY SEGREGATION; OMEGA PHASE; ALUMINUM; PRECIPITATE; ENERGETICS; EVOLUTION; SILVER;
D O I：
10.1016/j.scriptamat.2020.04.004
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Using aberration-corrected scanning transmission electron microscopy, the interface between Thprecipitates and Al matrix in the aged Al-2.1Zn-1.7Mg (at.%) alloy has been investigated. Atomic-resolution X-ray dispersive spectroscopy mapping reveals the occurrence of co-segregation of Mg and Zn atoms in the {002}(alpha) habit plane of the eta(1)(MgZn2) precipitates. Site-specific Mg atoms segregate outside the concave of an outermost zig-zag Zn-rich layer of the eta(1) habit plane. Zn segregation surround the segregated Mg atomic columns was also observed. Hybrid molecular dynamics (MD) and Monte Carlo (MC) atomistic simulations with the accuracy of density functional theory indicate the site-specific segregation is energetically favourable. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：51 / 55
页数：5
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