Ultrafine-Grained Microstructure and Improved Mechanical Behaviors of Friction Stir Welded Cu and Cu–30Zn Joints

Ultra-strong joints of pure Cu and Cu–30Zn alloy were obtained by friction stir welding under flowing water. The effects of heat inputting condition and material characteristics on the morphologies, microstructures and mechanical properties of welding joints were studied. Defect-free stirring zones...

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Bibliographic Details
Published inActa metallurgica sinica : English letters Vol. 31; no. 8; pp. 878 - 886
Main Authors Wang, Yan-Fei, An, Jian, Yin, Kun, Wang, Ming-Sai, Li, Yu-Sheng, Huang, Chong-Xiang
Format Journal Article
LanguageEnglish
Published Beijing The Chinese Society for Metals 01.08.2018
Springer Nature B.V
Subjects
Banded structure
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling
Copper
Corrosion and Coatings
Deformation
Digital imaging
Friction stir welding
Geometry
Grain size
Heat affected zone
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Organometallic Chemistry
Recrystallization
Scanning electron microscopy
Spectroscopy/Spectrometry
Stacking fault energy
Stirring
Tensile deformation
Tensile properties
Tribology
Ultrafines
Welded joints
Mechanical properties
Stacking fault energy
Digital image correlation (DIC)
Ultrafine grain
Friction stir welding
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Summary:Ultra-strong joints of pure Cu and Cu–30Zn alloy were obtained by friction stir welding under flowing water. The effects of heat inputting condition and material characteristics on the morphologies, microstructures and mechanical properties of welding joints were studied. Defect-free stirring zones of pure Cu and Cu–30Zn were characterized by onion-ringed structure and plastic flowing bands, respectively. Both low stacking fault energy and fast cooling condition contributed to the formation of small recrystallized grains less than 1 μm in stirring zones. The welding joints in both materials exhibited enhanced mechanical performances due to ultrafine-grained microstructure in stirring zones and disappearance of soft heat-affected-zone. The technique of digital image correlation was used to study the tensile deformation behaviors of welding joints and verify the improved tensile properties.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-018-0719-3