Stress-corrosion behavior and characteristics of the friction stir welding of an AA2198-T34 alloy

To better understand the stress-corrosion behavior of friction stir welding (FSW), the effects of the microstructure on the stress-corrosion behavior of the FSW in a 2198-T34 aluminum alloy were investigated. The experimental results show that the low-angle grain boundary (LABs) of the stir zone (SZ...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2020-06, Vol.27 (6), p.774-782
Main Authors: Zeng, Quan-qing, Zeng, Song-sheng, Wang, Dong-yao
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Compressive properties
Corrosion
Corrosion and Coatings
Corrosion effects
Corrosion potential
Crack initiation
Dislocation density
Friction
Friction stir welding
Glass
Grain boundaries
Heat affected zone
Materials Science
Metallic Materials
Microcracks
Natural Materials
Precipitates
Residual stress
Strain rate
Stress corrosion
Stress corrosion cracking
Surfaces and Interfaces
Tensile stress
Thin Films
Tribology
Welding
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Summary:To better understand the stress-corrosion behavior of friction stir welding (FSW), the effects of the microstructure on the stress-corrosion behavior of the FSW in a 2198-T34 aluminum alloy were investigated. The experimental results show that the low-angle grain boundary (LABs) of the stir zone (SZ) of FSW is significantly less than that of heated affected zone (HAZ), thermo-mechanically affected zone (TMAZ), and parent materials (PM), but the grain boundary precipitates (GBPs) T1 (Al 2 CuLi) were less, which has a slight effect on the stress corrosion. The dislocation density in SZ was greater than that in other regions. The residual stress in SZ was +67 MPa, which is greater than that in the TMAZ. The residual stress in the HAZ and PM is −8 MPa and −32 MPa, respectively, and both compressive stresses. The corrosion potential in SZ is obviously less than that in other regions. However, micro-cracks were formed in the SZ at low strain rate, which indicates that the grain boundary characters and GBPs have no significant effect on the crack initiation in the stress-corrosion process of the AA2198-T34. Nevertheless, the residual tensile stress has significant effect on the crack initiation during the stress-corrosion process.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-019-1924-4