Silver segregation to θ'' (Al2Cu)-Al interfaces in Al-Cu-Ag alloys

Julian Rosalie, Laure Nelly Bourgeois

Research output: Contribution to journalArticleResearchpeer-review

Abstract

θ′ (Al2Cu) precipitates in Al–Cu–Ag alloys were examined using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The precipitates nucleated on dislocation loops on which assemblies of γ′ (AlAg2) precipitates were present. These dislocation loops were enriched in silver prior to θ′ precipitation. Coherent, planar interfaces between the aluminium matrix and θ′ precipitates were decorated by a layer of silver two atomic layers in thickness. It is proposed that this layer lowers the chemical component of the Al–θ′ interfacial energy. The lateral growth of the θ′ precipitates was accompanied by the extension of this silver bilayer, resulting in the loss of silver from neighbouring γ′ precipitates and contributing to the deterioration of the γ′ precipitate assemblies.
Original languageEnglish
Pages (from-to)6033 - 6041
Number of pages9
JournalActa Materialia
Volume60
Issue number17
DOIs
Publication statusPublished - 2012

Cite this

@article{48513a04268e4bb59cdb728aa56f392a,
title = "Silver segregation to θ'' (Al2Cu)-Al interfaces in Al-Cu-Ag alloys",
abstract = "θ′ (Al2Cu) precipitates in Al–Cu–Ag alloys were examined using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The precipitates nucleated on dislocation loops on which assemblies of γ′ (AlAg2) precipitates were present. These dislocation loops were enriched in silver prior to θ′ precipitation. Coherent, planar interfaces between the aluminium matrix and θ′ precipitates were decorated by a layer of silver two atomic layers in thickness. It is proposed that this layer lowers the chemical component of the Al–θ′ interfacial energy. The lateral growth of the θ′ precipitates was accompanied by the extension of this silver bilayer, resulting in the loss of silver from neighbouring γ′ precipitates and contributing to the deterioration of the γ′ precipitate assemblies.",
author = "Julian Rosalie and Bourgeois, {Laure Nelly}",
year = "2012",
doi = "10.1016/j.actamat.2012.07.039",
language = "English",
volume = "60",
pages = "6033 -- 6041",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier",
number = "17",

}

Silver segregation to θ'' (Al2Cu)-Al interfaces in Al-Cu-Ag alloys. / Rosalie, Julian; Bourgeois, Laure Nelly.

In: Acta Materialia, Vol. 60, No. 17, 2012, p. 6033 - 6041.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Silver segregation to θ'' (Al2Cu)-Al interfaces in Al-Cu-Ag alloys

AU - Rosalie, Julian

AU - Bourgeois, Laure Nelly

PY - 2012

Y1 - 2012

N2 - θ′ (Al2Cu) precipitates in Al–Cu–Ag alloys were examined using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The precipitates nucleated on dislocation loops on which assemblies of γ′ (AlAg2) precipitates were present. These dislocation loops were enriched in silver prior to θ′ precipitation. Coherent, planar interfaces between the aluminium matrix and θ′ precipitates were decorated by a layer of silver two atomic layers in thickness. It is proposed that this layer lowers the chemical component of the Al–θ′ interfacial energy. The lateral growth of the θ′ precipitates was accompanied by the extension of this silver bilayer, resulting in the loss of silver from neighbouring γ′ precipitates and contributing to the deterioration of the γ′ precipitate assemblies.

AB - θ′ (Al2Cu) precipitates in Al–Cu–Ag alloys were examined using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The precipitates nucleated on dislocation loops on which assemblies of γ′ (AlAg2) precipitates were present. These dislocation loops were enriched in silver prior to θ′ precipitation. Coherent, planar interfaces between the aluminium matrix and θ′ precipitates were decorated by a layer of silver two atomic layers in thickness. It is proposed that this layer lowers the chemical component of the Al–θ′ interfacial energy. The lateral growth of the θ′ precipitates was accompanied by the extension of this silver bilayer, resulting in the loss of silver from neighbouring γ′ precipitates and contributing to the deterioration of the γ′ precipitate assemblies.

UR - http://dx.doi.org/10.1016/j.actamat.2012.07.039

U2 - 10.1016/j.actamat.2012.07.039

DO - 10.1016/j.actamat.2012.07.039

M3 - Article

VL - 60

SP - 6033

EP - 6041

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 17

ER -