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

Xu Xu; Min Hao; J. Chen; W. He; G. Li; Kexue Li; C. Jiao; Xiangli Zhong; Katie Moore; Timothy Burnett; Xiaorong Zhou

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

Xu Xu, Min Hao, J. Chen, W. He, G. Li, Kexue Li, C. Jiao, Xiangli Zhong, Katie Moore, Timothy Burnett, Xiaorong Zhou

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

Abstract

The corrosion behavior 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 minutes 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
Journal	Corrosion Science
Publication status	Accepted/In press - 1 Apr 2022

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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 behavior 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 minutes 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.",

author = "Xu Xu and Min Hao and J. Chen and W. He and G. Li and Kexue Li and C. Jiao and Xiangli Zhong and Katie Moore and Timothy Burnett and Xiaorong Zhou",

year = "2022",

month = apr,

day = "1",

language = "English",

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, Xu

AU - Hao, Min

AU - Chen, J.

AU - He, W.

AU - Li, G.

AU - Li, Kexue

AU - Jiao, C.

AU - Zhong, Xiangli

AU - Moore, Katie

AU - Burnett, Timothy

AU - Zhou, Xiaorong

PY - 2022/4/1

Y1 - 2022/4/1

N2 - The corrosion behavior 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 minutes 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 behavior 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 minutes 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.

M3 - Article

SN - 0010-938X

JO - Corrosion Science

JF - Corrosion Science

ER -

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

Abstract

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