On the corrosion, electrochemistry and microstructure of Al-Cu-Li alloy AA2050 as a function of ageing

Y. Yan; L. Peguet; O. Gharbi; A. Deschamps; C. R. Hutchinson; S. K. Kairy; N. Birbilis

doi:10.1016/j.mtla.2018.05.003

On the corrosion, electrochemistry and microstructure of Al-Cu-Li alloy AA2050 as a function of ageing

Y. Yan, L. Peguet, O. Gharbi, A. Deschamps, C. R. Hutchinson, S. K. Kairy, N. Birbilis^*

^*Corresponding author for this work

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

31 Citations (Scopus)

Abstract

The corrosion and microstructure of the Al-Cu-Li alloy AA2050 were investigated as a function of artificial ageing. The work herein seeks to provide a consolidated overview of the corrosion of AA2050, in particular the influence of T₁ (Al₂CuLi) precipitates on the observed behaviour. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterise the microstructural evolution of AA2050 during ageing. Accelerated immersion testing revealed that ageing was accompanied by the evolution of three unique stages of resultant corrosion morphologies – which were not correlated with the fine T₁ precipitate evolution. Electrochemical testing also revealed that AA2050 showed no discernible metastable pitting from potentiostatic testing. This phenomenon suggests that T₁ precipitates may remain too fine to induce localised corrosion in the matrix, and that T₁ precipitates in AA2050 are unlikely the controlling factor leading to the evolution of corrosion morphologies observed in AA2050. An elaboration of factors influencing the intergranular corrosion evolution and the role of grain boundary chemistry is also presented.

Original language	English
Pages (from-to)	25-36
Number of pages	12
Journal	Materialia
Volume	1
DOIs	https://doi.org/10.1016/j.mtla.2018.05.003
Publication status	Published - Sept 2018
Externally published	Yes

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title = "On the corrosion, electrochemistry and microstructure of Al-Cu-Li alloy AA2050 as a function of ageing",

abstract = "The corrosion and microstructure of the Al-Cu-Li alloy AA2050 were investigated as a function of artificial ageing. The work herein seeks to provide a consolidated overview of the corrosion of AA2050, in particular the influence of T1 (Al2CuLi) precipitates on the observed behaviour. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterise the microstructural evolution of AA2050 during ageing. Accelerated immersion testing revealed that ageing was accompanied by the evolution of three unique stages of resultant corrosion morphologies – which were not correlated with the fine T1 precipitate evolution. Electrochemical testing also revealed that AA2050 showed no discernible metastable pitting from potentiostatic testing. This phenomenon suggests that T1 precipitates may remain too fine to induce localised corrosion in the matrix, and that T1 precipitates in AA2050 are unlikely the controlling factor leading to the evolution of corrosion morphologies observed in AA2050. An elaboration of factors influencing the intergranular corrosion evolution and the role of grain boundary chemistry is also presented.",

keywords = "AA2050, Al-Cu-Li, Aluminium alloys, Intergranular corrosion, Transmission electron microscopy (TEM)",

author = "Y. Yan and L. Peguet and O. Gharbi and A. Deschamps and Hutchinson, {C. R.} and Kairy, {S. K.} and N. Birbilis",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = sep,

doi = "10.1016/j.mtla.2018.05.003",

language = "English",

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AU - Yan, Y.

AU - Peguet, L.

AU - Gharbi, O.

AU - Deschamps, A.

AU - Hutchinson, C. R.

AU - Kairy, S. K.

AU - Birbilis, N.

PY - 2018/9

Y1 - 2018/9

N2 - The corrosion and microstructure of the Al-Cu-Li alloy AA2050 were investigated as a function of artificial ageing. The work herein seeks to provide a consolidated overview of the corrosion of AA2050, in particular the influence of T1 (Al2CuLi) precipitates on the observed behaviour. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterise the microstructural evolution of AA2050 during ageing. Accelerated immersion testing revealed that ageing was accompanied by the evolution of three unique stages of resultant corrosion morphologies – which were not correlated with the fine T1 precipitate evolution. Electrochemical testing also revealed that AA2050 showed no discernible metastable pitting from potentiostatic testing. This phenomenon suggests that T1 precipitates may remain too fine to induce localised corrosion in the matrix, and that T1 precipitates in AA2050 are unlikely the controlling factor leading to the evolution of corrosion morphologies observed in AA2050. An elaboration of factors influencing the intergranular corrosion evolution and the role of grain boundary chemistry is also presented.

AB - The corrosion and microstructure of the Al-Cu-Li alloy AA2050 were investigated as a function of artificial ageing. The work herein seeks to provide a consolidated overview of the corrosion of AA2050, in particular the influence of T1 (Al2CuLi) precipitates on the observed behaviour. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterise the microstructural evolution of AA2050 during ageing. Accelerated immersion testing revealed that ageing was accompanied by the evolution of three unique stages of resultant corrosion morphologies – which were not correlated with the fine T1 precipitate evolution. Electrochemical testing also revealed that AA2050 showed no discernible metastable pitting from potentiostatic testing. This phenomenon suggests that T1 precipitates may remain too fine to induce localised corrosion in the matrix, and that T1 precipitates in AA2050 are unlikely the controlling factor leading to the evolution of corrosion morphologies observed in AA2050. An elaboration of factors influencing the intergranular corrosion evolution and the role of grain boundary chemistry is also presented.

KW - AA2050

KW - Al-Cu-Li

KW - Aluminium alloys

KW - Intergranular corrosion

KW - Transmission electron microscopy (TEM)

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DO - 10.1016/j.mtla.2018.05.003

M3 - Article

SN - 2589-1529

VL - 1

SP - 25

EP - 36

JO - Materialia

JF - Materialia

ER -

On the corrosion, electrochemistry and microstructure of Al-Cu-Li alloy AA2050 as a function of ageing

Abstract

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