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Correlation between localized plastic deformation and localized corrosion in AA2099 aluminum‐lithium alloy
Author(s) -
Huang Weijiu,
Ma Yanlong,
Zhou Xiaorong,
Meng Xiaomin,
Liao Yi,
Chai Linjiang,
Yi Yanan,
Zhang Xinxin
Publication year - 2016
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5817
Subject(s) - alloy , corrosion , materials science , aluminium , precipitation , metallurgy , lithium (medication) , phase (matter) , lüders band , slip (aerodynamics) , severe plastic deformation , composite material , microstructure , chemistry , thermodynamics , medicine , physics , organic chemistry , meteorology , endocrinology
Localized corrosion in an AA2099‐T83 aluminum–lithium alloy has been correlated with localized plastic deformation (LPD) introduced by cold working. The high population density of dislocations in the slip bands associated with LPD promoted preferential precipitation of needle‐shaped T 1 (Al 2 CuLi) phase during artificial aging. Consequently, preferential attack of the electrochemically active T 1 phase in corrosive environment resulted in selective corrosion of the bands, leading to the development of the characteristic morphology of narrow, parallel volume of corrosion. Copyright © 2015 John Wiley & Sons, Ltd.