Microstructure and anisotropic mechanical behavior of friction stir welded AA2024 alloy sheets

Journal Article · Tue Sep 15 04:00:00 EDT 2015 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2015.06.039· OSTI ID:22476157

Zhang, Zhihan ^[1]; Li, Wenya ^[1]; Li, Jinglong ^[1]; Chao, Y. J. ^[2]; Vairis, A. ^[3]

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1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an 710072, Shaanxi (China)
2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208 (United States)
3. Mechanical Engineering Department, TEI of Crete, Heraklion, Crete 71004 (Greece)

The anisotropic mechanical properties of friction stir welded (FSW) AA2024-T3 alloy joints were investigated based on the uniaxial tensile tests. The joint microstructure was examined by using electron back-scattered diffraction and transmission electron microscope. Results show that the evident anisotropic failure and yielding are present in the FSW joints. With the increase of loading angle from 0° to 90° the ultimate tensile strength and elongation of the specimens consistently decrease, or at first decrease and then increase, depending on the FSW process parameters. The specimen cut from the weld direction, i.e. a loading angle of 0°, exhibits the highest strength and elongation. - Highlights: • Microstructure and anisotropy of friction stir welded joints were studied. • The evident anisotropic failure and yielding are present in joints. • The lowest yield stress and UTS are at 45° and 60° loadings, respectively. • Rotation speed heavily impact on the anisotropy of joints.

• OSTI ID: 22476157
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 107; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANISOTROPY
BACKSCATTERING
ELECTRON DIFFRACTION
ELONGATION
MICROSTRUCTURE
STRESSES
TENSILE PROPERTIES
TRANSMISSION ELECTRON MICROSCOPY
WELDED JOINTS