Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys

P. L. Niu; W. Y. Li; N. Li; Y. X. Xu; D. L. Chen

doi:10.1016/j.matchar.2018.11.002

Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys

P. L. Niu, W. Y. Li, N. Li, Y. X. Xu, D. L. Chen

材料学院

科研成果: 期刊稿件 › 文章 › 同行评审

79 引用（Scopus）

摘要

The objective of this study was to identify the effect of base metal (BM) locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution. Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were conducted to characterize the microstructure evolution of the BMs and stir zones (SZs). Scanning electron microscopy (SEM) was employed to observe the appearance of these corroded zones. Results reveal that the corrosion resistance of SZs is similar to that of the BM positioning in the retreating side (RS), and intergranular corrosion (IGC) is prevailing. The fine recrystallized grains in SZs exhibit more drastic IGC than that of BMs. The discontinuously distributed grain boundary precipitates and precipitate-free zones in the SZ of 2024 reduce the IGC damage of SZ.

源语言	英语
页（从-至）	93-100
页数	8
期刊	Materials Characterization
卷	147
DOI	https://doi.org/10.1016/j.matchar.2018.11.002
出版状态	已出版 - 1月 2019

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10.1016/j.matchar.2018.11.002

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title = "Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys",

abstract = "The objective of this study was to identify the effect of base metal (BM) locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution. Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were conducted to characterize the microstructure evolution of the BMs and stir zones (SZs). Scanning electron microscopy (SEM) was employed to observe the appearance of these corroded zones. Results reveal that the corrosion resistance of SZs is similar to that of the BM positioning in the retreating side (RS), and intergranular corrosion (IGC) is prevailing. The fine recrystallized grains in SZs exhibit more drastic IGC than that of BMs. The discontinuously distributed grain boundary precipitates and precipitate-free zones in the SZ of 2024 reduce the IGC damage of SZ.",

keywords = "Aluminum alloys, Corrosion resistance, Dissimilar, Friction stir welding, Grain size",

author = "Niu, {P. L.} and Li, {W. Y.} and N. Li and Xu, {Y. X.} and Chen, {D. L.}",

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

year = "2019",

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doi = "10.1016/j.matchar.2018.11.002",

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T1 - Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys

AU - Niu, P. L.

AU - Li, W. Y.

AU - Li, N.

AU - Xu, Y. X.

AU - Chen, D. L.

PY - 2019/1

Y1 - 2019/1

N2 - The objective of this study was to identify the effect of base metal (BM) locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution. Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were conducted to characterize the microstructure evolution of the BMs and stir zones (SZs). Scanning electron microscopy (SEM) was employed to observe the appearance of these corroded zones. Results reveal that the corrosion resistance of SZs is similar to that of the BM positioning in the retreating side (RS), and intergranular corrosion (IGC) is prevailing. The fine recrystallized grains in SZs exhibit more drastic IGC than that of BMs. The discontinuously distributed grain boundary precipitates and precipitate-free zones in the SZ of 2024 reduce the IGC damage of SZ.

AB - The objective of this study was to identify the effect of base metal (BM) locations on the corrosion behavior of friction stir welded dissimilar 2024-T351 to 7075-T651 aluminum alloys joints in an EXCO solution. Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were conducted to characterize the microstructure evolution of the BMs and stir zones (SZs). Scanning electron microscopy (SEM) was employed to observe the appearance of these corroded zones. Results reveal that the corrosion resistance of SZs is similar to that of the BM positioning in the retreating side (RS), and intergranular corrosion (IGC) is prevailing. The fine recrystallized grains in SZs exhibit more drastic IGC than that of BMs. The discontinuously distributed grain boundary precipitates and precipitate-free zones in the SZ of 2024 reduce the IGC damage of SZ.

KW - Aluminum alloys

KW - Corrosion resistance

KW - Dissimilar

KW - Friction stir welding

KW - Grain size

UR - http://www.scopus.com/inward/record.url?scp=85055968310&partnerID=8YFLogxK

U2 - 10.1016/j.matchar.2018.11.002

DO - 10.1016/j.matchar.2018.11.002

M3 - 文章

AN - SCOPUS:85055968310

SN - 1044-5803

VL - 147

SP - 93

EP - 100

JO - Materials Characterization

JF - Materials Characterization

ER -

Exfoliation corrosion of friction stir welded dissimilar 2024-to-7075 aluminum alloys

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