The disordered structure of Q′ and C phases in Al-Mg-Si-Cu alloy

被引：34
|
作者：
Ding, Lipeng [1 ]
Hu, Hai [2 ]
Jia, Zhihong [1 ]
Weng, Yaoyao [1 ]
Wu, Xiaozhi [2 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Coll Phys, Chongqing 400044, Peoples R China
来源：
SCRIPTA MATERIALIA | 2016年 / 118卷
基金：
中国国家自然科学基金; 对外科技合作项目（国际科技项目）;
关键词：
Aluminum alloys; Precipitate; Disordered; High angle annular dark-field scanning; PRECIPITATION; ADDITIONS; COPPER; BETA';
D O I：
10.1016/j.scriptamat.2016.03.011
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The disordered structures of the Q' and C phases in the over-aged Al-Mg-Si-Cu alloy were studied by the atomic resolution high-angle annular dark-field scanning transmission electron microscopy and density functional theory calculations. A Cu cluster-like zone is found in both the well-ordered and disordered regions of the disordered precipitates, which acts as a stable skeleton of these phases. The statistic result shows that the C phase is more preferential to produce disordered structure than the Q' phase. The mechanism for forming the highly disordered C phase is attributed to the relatively weak metallic bonding between the Al-Si1 and Mg2-Si1 atoms. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：55 / 59
页数：5
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