Atomic segregation at twin boundaries in a Mg-Ag alloy

X. F. Chen; L. R. Xiao; Z. G. Ding; W. Liu; Y. T. Zhu; X. L. Wu

doi:10.1016/j.scriptamat.2019.11.025

Atomic segregation at twin boundaries in a Mg-Ag alloy

X. F. Chen, L. R. Xiao, Z. G. Ding^*, W. Liu, Y. T. Zhu, X. L. Wu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

57 Citations (Scopus)

Abstract

Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {101¯1}, {101¯2} and {101¯3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {101¯3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {101¯1} and {101¯2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation.

Original language	English
Pages (from-to)	193-197
Journal	Scripta Materialia
Volume	178
Online published	21 Nov 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.11.025
Publication status	Published - 15 Mar 2020
Externally published	Yes

Research Keywords

HAADF-STEM
Magnesium alloy
Segregation
Twin boundary

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title = "Atomic segregation at twin boundaries in a Mg-Ag alloy",

abstract = "Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {101¯1}, {101¯2} and {101¯3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {101¯3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {101¯1} and {101¯2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation.",

keywords = "HAADF-STEM, Magnesium alloy, Segregation, Twin boundary, HAADF-STEM, Magnesium alloy, Segregation, Twin boundary, HAADF-STEM, Magnesium alloy, Segregation, Twin boundary",

author = "Chen, {X. F.} and Xiao, {L. R.} and Ding, {Z. G.} and W. Liu and Zhu, {Y. T.} and Wu, {X. L.}",

year = "2020",

month = mar,

day = "15",

doi = "10.1016/j.scriptamat.2019.11.025",

language = "English",

volume = "178",

pages = "193--197",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

}

TY - JOUR

T1 - Atomic segregation at twin boundaries in a Mg-Ag alloy

AU - Chen, X. F.

AU - Xiao, L. R.

AU - Ding, Z. G.

AU - Liu, W.

AU - Zhu, Y. T.

AU - Wu, X. L.

PY - 2020/3/15

Y1 - 2020/3/15

N2 - Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {101¯1}, {101¯2} and {101¯3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {101¯3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {101¯1} and {101¯2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation.

AB - Segregation of solute atoms at twin boundaries (TBs) plays a critical role in mechanical properties and thermal stability of magnesium alloys. Here, segregation structures at {101¯1}, {101¯2} and {101¯3} TBs are characterized in a Mg-Ag alloy by means of the atomic resolution high-angle annular dark-field technique based on scanning transmission electron microscopy. Of particular finding is the unique complex segregation at {101¯3} TBs, where Ag atoms occupy both substitutional and interstitial sites. By contrast, Ag atoms only substitutionally segregate at {101¯1} and {101¯2} TBs. Calculation simulation of segregation energy and three-dimensional structure of TBs helps understanding of hybrid segregation.

KW - HAADF-STEM

KW - Magnesium alloy

KW - Segregation

KW - Twin boundary

KW - HAADF-STEM

KW - Magnesium alloy

KW - Segregation

KW - Twin boundary

KW - HAADF-STEM

KW - Magnesium alloy

KW - Segregation

KW - Twin boundary

UR - http://www.scopus.com/inward/record.url?scp=85075220330&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85075220330&origin=recordpage

U2 - 10.1016/j.scriptamat.2019.11.025

DO - 10.1016/j.scriptamat.2019.11.025

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6462

VL - 178

SP - 193

EP - 197

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Atomic segregation at twin boundaries in a Mg-Ag alloy

Abstract

Research Keywords

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