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

Bingqing Cheng; Xiaojun Zhao; Yong Zhang; Houwen Chen; Ian Polmear; Jian Feng Nie

doi:10.1016/j.scriptamat.2020.04.004

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

Bingqing Cheng, Xiaojun Zhao, Yong Zhang, Houwen Chen, Ian Polmear, Jian Feng Nie

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

24 Citations (Scopus)

Abstract

Using aberration-corrected scanning transmission electron microscopy, the interface between η₁-precipitates and Al matrix in the aged Al–2.12Zn–1.71Mg (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}_α habit plane of the η₁(MgZn₂) precipitates. Site-specific Mg atoms segregate outside the concave of an outermost zig-zag Zn-rich layer of the η₁ 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.

Original language	English
Pages (from-to)	51-55
Number of pages	5
Journal	Scripta Materialia
Volume	185
DOIs	https://doi.org/10.1016/j.scriptamat.2020.04.004
Publication status	Published - Aug 2020

Keywords

Aluminium alloys
Deep neural network based calculation and simulation
Energy-Dispersive X-ray Spectroscopy
High-angle annular dark field
Interface segregation

Access to Document

10.1016/j.scriptamat.2020.04.004

304219688-oaAccepted author manuscript, 1.68 MBLicence: CC BY-NC-ND

Cite this

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

abstract = "Using aberration-corrected scanning transmission electron microscopy, the interface between η1-precipitates and Al matrix in the aged Al–2.12Zn–1.71Mg (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}α habit plane of the η1(MgZn2) precipitates. Site-specific Mg atoms segregate outside the concave of an outermost zig-zag Zn-rich layer of the η1 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.",

keywords = "Aluminium alloys, Deep neural network based calculation and simulation, Energy-Dispersive X-ray Spectroscopy, High-angle annular dark field, Interface segregation",

author = "Bingqing Cheng and Xiaojun Zhao and Yong Zhang and Houwen Chen and Ian Polmear and Nie, {Jian Feng}",

year = "2020",

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T1 - Co-segregation of Mg and Zn atoms at the planar η1-precipitate/Al matrix interface in an aged Al–Zn–Mg alloy

AU - Cheng, Bingqing

AU - Zhao, Xiaojun

AU - Zhang, Yong

AU - Chen, Houwen

AU - Polmear, Ian

AU - Nie, Jian Feng

PY - 2020/8

Y1 - 2020/8

N2 - Using aberration-corrected scanning transmission electron microscopy, the interface between η1-precipitates and Al matrix in the aged Al–2.12Zn–1.71Mg (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}α habit plane of the η1(MgZn2) precipitates. Site-specific Mg atoms segregate outside the concave of an outermost zig-zag Zn-rich layer of the η1 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.

AB - Using aberration-corrected scanning transmission electron microscopy, the interface between η1-precipitates and Al matrix in the aged Al–2.12Zn–1.71Mg (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}α habit plane of the η1(MgZn2) precipitates. Site-specific Mg atoms segregate outside the concave of an outermost zig-zag Zn-rich layer of the η1 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.

KW - Aluminium alloys

KW - Deep neural network based calculation and simulation

KW - Energy-Dispersive X-ray Spectroscopy

KW - High-angle annular dark field

KW - Interface segregation

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