Effects of Laser Shock Peening on the Mechanical Behaviors and Microstructure of Friction Stir Processed 2A14 Aluminum A
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Effects of Laser Shock Peening on the Mechanical Behaviors and Microstructure of Friction Stir Processed 2A14 Aluminum Alloy Jian Wang, Dongshuai Zhou, Yalin Lu, Li Xie, Zhihao Bai, Jiangtao Wang, and Xingcheng Li Submitted: 8 May 2020 / Revised: 28 July 2020 / Accepted: 12 August 2020 The influence of laser shock peening (LSP) on the microstructures and mechanical behaviors of the friction stir processed (FSPed) 2A14 aluminum alloy was investigated. Microhardness and tensile measurements, as well as wear test, were taken to analyze the changes in mechanical characteristics. The vibration fatigue experiments were also conducted, while the vibration fatigue life of the specimens with different treatments was compared and the fracture morphologies were observed by scanning electron microscopy. The microstructures before and after LSP were observed with electron backscattered diffraction and transmission electron microscopy. The analysis results evidenced that LSP significantly improved the mechanical properties of the FSPed specimens. Meanwhile, LSP increased the dislocation density and promoted the precipitation of the second phases on the surface layer of the FSPed 2A14 aluminum alloy, while their interactions improved the stability of the dislocation structures, which contributed to the improvement of the mechanical behaviors. Keywords
2A14 aluminum alloy, friction stir processing, laser shock peening, mechanical properties, microstructural evolution
1. Introduction Because of the high strength, good cutting performance, excellent electrical resistivity and welding performance, 2A14 aluminum alloy has been widely utilized in aerospace industry as a variety of structural parts (Ref 1, 2). However, the hardness of the 2A14 aluminum alloy is relatively low, while the wear resistance is also very poor. Meanwhile, the key components, especially welded parts, are prone to fatigue until failure during the service process, so it is urgent to enhance the fatigue resistance and fracture toughness (Ref 3, 4). Friction stir processing (FSP) is a solid processing technique that evolved from friction stir welding (FSW) (Ref 5). And the basic principle is that the processed material experiences severe plastic deformation under the strong stirring action, which leads to densification, homogenization and refinement of the treated microstructures, thus improving the mechanical properties of the stirred zone (Ref 6, 7). Although FSP/FSW can significantly refine the grain and produce relatively lower and uniform distributed stress, it results in degraded corrosion resistance and
Jian Wang, Li Xie, and Zhihao Bai, School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China; and Dongshuai Zhou, Yalin Lu, Jiangtao Wang, and Xingcheng Li, School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China; and Key Laboratory of Advanced Materials Design and Additive Manufacturing of Jiangsu Province, Changzhou 213001, China. Contact e-mail: luyalin@16
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