Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy

X. Xu; M. Hao; J. Chen; W. He; G. Li; K. Li; C. Jiao; X. L. Zhong; K. L. Moore; T. L. Burnett; X. Zhou

doi:10.1016/j.corsci.2022.110294

Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy

X. Xu, M. Hao, J. Chen, W. He, G. Li, K. Li, C. Jiao, X. L. Zhong, K. L. Moore, T. L. Burnett^*, X. Zhou^*

^*Corresponding author for this work

Thermo Fisher Scientific

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

Abstract

The corrosion behaviour of a recently developed Al-Li-Cu-Mg alloy thick plate was investigated using correlative immersion testing in 3.5% NaCl solution with analytical electron and ion microscopy. Intergranular corrosion was observed along grain boundaries and the particle-matrix interface of Al₇Cu₂(Fe, Mn) and Al₂₀Cu₂Mn₃ phases from 7 min of immersion. The Li-containing Al₇Cu₂(Fe, Mn) phases are electrochemically more active and susceptible to de-alloying than the Al₂₀Cu₂Mn₃ phases. Intergranular T₁ (Al₂CuLi) precipitates are attacked via selective dissolution of Li and Al. In contrast to previous observation, the dissolution rates of T₁ precipitates and the adjacent alloy matrix are almost the same.

Original language	English
Article number	110294
Journal	Corrosion Science
Volume	201
Early online date	4 Apr 2022
DOIs	https://doi.org/10.1016/j.corsci.2022.110294
Publication status	Published - 1 Jun 2022

Keywords

Aluminium-lithium alloy
Constituent intermetallic phase
Correlative microscopy
Intergranular corrosion
Precipitate

Research Beacons, Institutes and Platforms

Photon Science Institute
Henry Royce Institute

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10.1016/j.corsci.2022.110294Licence: CC BY

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@article{099bba36c89b4a20be221e1c11137c71,

title = "Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy",

abstract = "The corrosion behaviour of a recently developed Al-Li-Cu-Mg alloy thick plate was investigated using correlative immersion testing in 3.5% NaCl solution with analytical electron and ion microscopy. Intergranular corrosion was observed along grain boundaries and the particle-matrix interface of Al7Cu2(Fe, Mn) and Al20Cu2Mn3 phases from 7 min of immersion. The Li-containing Al7Cu2(Fe, Mn) phases are electrochemically more active and susceptible to de-alloying than the Al20Cu2Mn3 phases. Intergranular T1 (Al2CuLi) precipitates are attacked via selective dissolution of Li and Al. In contrast to previous observation, the dissolution rates of T1 precipitates and the adjacent alloy matrix are almost the same.",

keywords = "Aluminium-lithium alloy, Constituent intermetallic phase, Correlative microscopy, Intergranular corrosion, Precipitate",

author = "X. Xu and M. Hao and J. Chen and W. He and G. Li and K. Li and C. Jiao and Zhong, {X. L.} and Moore, {K. L.} and Burnett, {T. L.} and X. Zhou",

note = "Publisher Copyright: {\textcopyright} 2022 The Authors",

year = "2022",

month = jun,

day = "1",

doi = "10.1016/j.corsci.2022.110294",

language = "English",

volume = "201",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy

AU - Xu, X.

AU - Hao, M.

AU - Chen, J.

AU - He, W.

AU - Li, G.

AU - Li, K.

AU - Jiao, C.

AU - Zhong, X. L.

AU - Moore, K. L.

AU - Burnett, T. L.

AU - Zhou, X.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - The corrosion behaviour of a recently developed Al-Li-Cu-Mg alloy thick plate was investigated using correlative immersion testing in 3.5% NaCl solution with analytical electron and ion microscopy. Intergranular corrosion was observed along grain boundaries and the particle-matrix interface of Al7Cu2(Fe, Mn) and Al20Cu2Mn3 phases from 7 min of immersion. The Li-containing Al7Cu2(Fe, Mn) phases are electrochemically more active and susceptible to de-alloying than the Al20Cu2Mn3 phases. Intergranular T1 (Al2CuLi) precipitates are attacked via selective dissolution of Li and Al. In contrast to previous observation, the dissolution rates of T1 precipitates and the adjacent alloy matrix are almost the same.

AB - The corrosion behaviour of a recently developed Al-Li-Cu-Mg alloy thick plate was investigated using correlative immersion testing in 3.5% NaCl solution with analytical electron and ion microscopy. Intergranular corrosion was observed along grain boundaries and the particle-matrix interface of Al7Cu2(Fe, Mn) and Al20Cu2Mn3 phases from 7 min of immersion. The Li-containing Al7Cu2(Fe, Mn) phases are electrochemically more active and susceptible to de-alloying than the Al20Cu2Mn3 phases. Intergranular T1 (Al2CuLi) precipitates are attacked via selective dissolution of Li and Al. In contrast to previous observation, the dissolution rates of T1 precipitates and the adjacent alloy matrix are almost the same.

KW - Aluminium-lithium alloy

KW - Constituent intermetallic phase

KW - Correlative microscopy

KW - Intergranular corrosion

KW - Precipitate

UR - https://www.mendeley.com/catalogue/81d80940-1387-396f-bb8a-aa426cbeb828/

U2 - 10.1016/j.corsci.2022.110294

DO - 10.1016/j.corsci.2022.110294

M3 - Article

AN - SCOPUS:85127701857

SN - 0010-938X

VL - 201

JO - Corrosion Science

JF - Corrosion Science

M1 - 110294

ER -

Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy

Abstract

Keywords

Research Beacons, Institutes and Platforms

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Nanoscale Secondary Ion Mass Spectrometry (NanoSIMS)

Surface Characterisation

Cite this

Role of constituent intermetallic phases and precipitates in initiation and propagation of intergranular corrosion of an Al-Li-Cu-Mg alloy

Abstract

Keywords

Research Beacons, Institutes and Platforms

Access to Document

Other files and links

Fingerprint

Equipment

Nanoscale Secondary Ion Mass Spectrometry (NanoSIMS)

Surface Characterisation

Cite this