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Microstructural Characteristics and Mechanical Properties of 7050-T7451 Aluminum Alloy Friction Stir-Welded Joints

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Abstract

The ultra-high-strength Al-Zn-Mg-Cu alloy, 7050-T7451, was friction stir welded at a constant tool rotation speed of 600 rpm. Defect-free welds were successfully obtained at a welding speed of 100 mm/min, but lack-of-penetration defect was formed at a welding speed of 400 mm/min. The as-received material was mainly composed of coarse-deformed grains with some fine recrystallized grains. Fine equiaxed, dynamic, recrystallized grains were developed in the stir zone, and elongated grains were formed in the thermomechanically affected zone with dynamic recovered subgrains. Grain sizes in different regions of friction stir-welded joints varied depending on the welding speed. The sizes and distributions of precipitates changed in different regions of the joint, and wider precipitation free zone was developed in the heat-affected zone compared to that in the base material. Hardness of the heat-affected zone was obviously lower than that of the base material, and the softening region width was related to the welding speed. The tensile strength of the defect-free joints increased with the increasing welding speed, while the lack-of-penetration defect greatly reduced the tensile strength. The tensile fracture path was significantly influenced by the position and orientation of lack-of-penetration defect.

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Acknowledgments

The research was sponsored by the China Postdoctoral Science Foundation (Grant No. 2015M570287), the Indigenous Innovation and Achievement Transformation Program of Shandong Province (2014CGZH1003), the Key Research & Development program of Shandong Province (2015GGX103002), the Industry-Study-Research Cooperative Innovation Demonstration Project of Weihai City (2014CXY02), the Science and Technology Development Program of Weihai City (2014DXGJ17), and the Natural Scientific Research Innovation in Harbin Institute of Technology (HIT.NSRIF.2014131).

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China

    L. Zhou, T. Wang, W. L. Zhou, Z. Y. Li & J. C. Feng

  2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    L. Zhou, Y. X. Huang & J. C. Feng

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  1. L. Zhou
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  2. T. Wang
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  3. W. L. Zhou
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Correspondence to T. Wang.

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Zhou, L., Wang, T., Zhou, W.L. et al. Microstructural Characteristics and Mechanical Properties of 7050-T7451 Aluminum Alloy Friction Stir-Welded Joints. J. of Materi Eng and Perform 25, 2542–2550 (2016). https://doi.org/10.1007/s11665-016-2106-4

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  • DOI: https://doi.org/10.1007/s11665-016-2106-4

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