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

被引：28

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：

澳大利亚研究理事会; 中国国家自然科学基金;

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

页码：51 / 55

页数：5

共 27 条

[1] Modelling the inelastic scattering of fast electrons
Allen, L. J.
D'Alfonso, A. J.
Findlay, S. D.
[J]. ULTRAMICROSCOPY, 2015, 151 : 11 - 22
[2] Microstructural evolution during ageing of Al-Cu-Li-x alloys
Araullo-Peters, Vicente
Gault, Baptiste
de Geuser, Frederic
Deschamps, Alexis
Cairney, Julie M.
[J]. ACTA MATERIALIA, 2014, 66 : 199 - 208
[3] Atomic scale HAADF-STEM study of η′ and η1 phases in peak-aged Al-Zn-Mg alloys
Bendo, Artenis
Matsuda, Kenji
Lee, Seungwon
Nishimura, Katsuhiko
Nunomura, Norio
Toda, Hiroyuki
Yamaguchi, Masatake
Tsuru, Tomohito
Hirayama, Kyosuke
Shimizu, Kazuyuki
Gao, Hongye
Ebihara, Kenichi
Itakura, Mitsuhiro
Yoshida, Tomoo
Murakami, Satoshi
[J]. JOURNAL OF MATERIALS SCIENCE, 2018, 53 (06) : 4598 - 4611
[4] PROJECTOR AUGMENTED-WAVE METHOD
BLOCHL, PE
[J]. PHYSICAL REVIEW B, 1994, 50 (24): : 17953 - 17979
[5] Structure and energetics of the coherent interface between the θ′ precipitate phase and aluminium in Al-Cu
Bourgeois, Laure
Dwyer, Christian
Weyland, Matthew
Nie, Jian-Feng
Muddle, Barrington C.
[J]. ACTA MATERIALIA, 2011, 59 (18) : 7043 - 7050
[6] An atomic scale structural investigation of nanometre-sized η precipitates in the 7050 aluminium alloy
Chung, Tsai-Fu
Yang, Yo-Lun
Shiojiri, Makoto
Hsiao, Chien-Nan
Li, Wei-Chih
Tsao, Cheng-Si
Shi, Zhusheng
Lin, Jianguo
Yang, Jer-Ren
[J]. ACTA MATERIALIA, 2019, 174 : 351 - 368
[7] Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy
Chung, Tsai-Fu
Yang, Yo-Lun
Huang, Bo-Ming
Shi, Zhusheng
Lin, Jianguo
Ohmura, Takahito
Yang, Jer-Ren
[J]. ACTA MATERIALIA, 2018, 149 : 377 - 387
[8] Formation of multiple orientation relationships of Q precipitates in Al-Mg-Si-Cu alloys
Fiawoo, M.
Gao, X.
Bourgeois, L.
Parson, N.
Zhang, X. Q.
Couper, M.
Nie, J. F.
[J]. SCRIPTA MATERIALIA, 2014, 88 : 53 - 56
[9] AN ELECTRON MICROSCOPE INVESTIGATION OF MICROSTRUCTURE IN AN ALUMINUM-ZINC-MAGNESIUM ALLOY
GJONNES, J
SIMENSEN, CJ
[J]. ACTA METALLURGICA, 1970, 18 (08): : 881 - &
[10] Determination of interfacial atomic structure, misfits and energetics of Ω phase in Al-Cu-Mg-Ag alloy
Kang, Sung Jin
Kim, Young-Woon
Kim, Miyoung
Zuo, Jian-Min
[J]. ACTA MATERIALIA, 2014, 81 : 501 - 511

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