The multiple orientation relationships and morphology of β phase in Al-Mg-Si-Cu alloy

被引：21
|
作者：
Weng, Yaoyao [1 ,5 ]
Jia, Zhihong [1 ,2 ]
Ding, Lipeng [3 ,4 ]
Muraishi, Shinji [5 ]
Wu, Xiaozhi [6 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China
[3] Catholic Univ Louvain, IMAP, Inst Mech Mat & Civil Engn, B-1348 Louvain La Neuve, Belgium
[4] Univ Antwerp, Dept Phys, Electron Microscopy Mat Sci EMAT, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
[5] Tokyo Inst Technol, Dept Met & Ceram Sci, 2-12-1 Meguro Ku, Tokyo 1528552, Japan
[6] Chongqing Univ, Coll Phys, Chongqing 400044, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 767卷
基金：
中国国家自然科学基金;
关键词：
Aluminum alloy; Precipitates; Atomic resolution HAADF-STEM; Orientation relationship; Cu segregation; CRYSTAL-STRUCTURE; PRECIPITATION SEQUENCE; AG ALLOYS; SEGREGATION; STABILITY; EVOLUTION; GROWTH; PLATES;
D O I：
10.1016/j.jallcom.2018.07.077
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：
The orientation relationships (ORs), segregation behavior and morphologies of beta precipitate in an over aged Al-Mg-Si-Cu alloy are systematically characterized by atomic resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Six different ORs and two morphologies, i.e. rod-and lath-like are revealed for beta precipitates, and Cu segregation at the (beta/alpha-Al interface is observed in all these precipitates. The rod-like beta precipitate has multiple beta-angles ranging from 6.1 to 14.1 degrees and non-uniform Cu segregation at the (beta/alpha-Al interface, while the lath-like beta precipitate has a constant beta-angle of 0 degrees and a periodic Cu segregation. These different ORs are explained to be attributable to the rotation of QP lattice, a near-hexagonal network of Si columns formed within beta precipitates, which causes different lattice matching of beta with alpha-Al lattice. These findings provide new insights in controlling the precipitation hardening and mechanical properties of this type of alloys. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：81 / 89
页数：9
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