Zn segregation in interface between Mg17Al12 precipitate and Mg matrix in Mg–Al–Zn alloys

C. Q. Liu; H. W. Chen; N. C. Wilson; J. F. Nie

doi:10.1016/j.scriptamat.2019.01.001

Zn segregation in interface between Mg₁₇Al₁₂ precipitate and Mg matrix in Mg–Al–Zn alloys

C. Q. Liu, H. W. Chen, N. C. Wilson, J. F. Nie

Materials Science & Engineering

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

15 Citations (Scopus)

Abstract

The interface between continuous Mg₁₇Al₁₂ precipitate and the Mg matrix in Mg–9Al–3Zn alloy has been characterized using aberration-corrected scanning transmission electron microscopy. It is found that Zn segregation occurs in the partially-coherent interface that is parallel to the basal plane of the Mg matrix and contains an array of misfit dislocations. The segregated Zn atoms substitute for the Al atoms within the interface and the segregation is not affected by the presence of the misfit dislocations. First-principles calculations suggest that Zn segregation is energetically favored.

Original language	English
Pages (from-to)	91-95
Number of pages	5
Journal	Scripta Materialia
Volume	163
DOIs	https://doi.org/10.1016/j.scriptamat.2019.01.001
Publication status	Published - 1 Apr 2019

Keywords

AZ alloys
DFT
HAADF-STEM
Interfacial segregation

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10.1016/j.scriptamat.2019.01.001

Link to publication in Scopus

Cite this

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title = "Zn segregation in interface between Mg17Al12 precipitate and Mg matrix in Mg–Al–Zn alloys",

abstract = "The interface between continuous Mg17Al12 precipitate and the Mg matrix in Mg–9Al–3Zn alloy has been characterized using aberration-corrected scanning transmission electron microscopy. It is found that Zn segregation occurs in the partially-coherent interface that is parallel to the basal plane of the Mg matrix and contains an array of misfit dislocations. The segregated Zn atoms substitute for the Al atoms within the interface and the segregation is not affected by the presence of the misfit dislocations. First-principles calculations suggest that Zn segregation is energetically favored.",

keywords = "AZ alloys, DFT, HAADF-STEM, Interfacial segregation",

author = "Liu, {C. Q.} and Chen, {H. W.} and Wilson, {N. C.} and Nie, {J. F.}",

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T1 - Zn segregation in interface between Mg17Al12 precipitate and Mg matrix in Mg–Al–Zn alloys

AU - Liu, C. Q.

AU - Chen, H. W.

AU - Wilson, N. C.

AU - Nie, J. F.

PY - 2019/4/1

Y1 - 2019/4/1

N2 - The interface between continuous Mg17Al12 precipitate and the Mg matrix in Mg–9Al–3Zn alloy has been characterized using aberration-corrected scanning transmission electron microscopy. It is found that Zn segregation occurs in the partially-coherent interface that is parallel to the basal plane of the Mg matrix and contains an array of misfit dislocations. The segregated Zn atoms substitute for the Al atoms within the interface and the segregation is not affected by the presence of the misfit dislocations. First-principles calculations suggest that Zn segregation is energetically favored.

AB - The interface between continuous Mg17Al12 precipitate and the Mg matrix in Mg–9Al–3Zn alloy has been characterized using aberration-corrected scanning transmission electron microscopy. It is found that Zn segregation occurs in the partially-coherent interface that is parallel to the basal plane of the Mg matrix and contains an array of misfit dislocations. The segregated Zn atoms substitute for the Al atoms within the interface and the segregation is not affected by the presence of the misfit dislocations. First-principles calculations suggest that Zn segregation is energetically favored.

KW - AZ alloys

KW - DFT

KW - HAADF-STEM

KW - Interfacial segregation

UR - http://www.scopus.com/inward/record.url?scp=85059848689&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2019.01.001

DO - 10.1016/j.scriptamat.2019.01.001

M3 - Article

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VL - 163

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EP - 95

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

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