Mechanical and Damping Behavior of Age-Hardened and Non-age-hardened Al Alloys After Friction Stir Processing

Jiang, Haojie; Zhang, Bing; Liu, Chong-yu; Yang, Z. X.; Ma, Z.Y.

doi:10.1007/s40195-019-00905-3

Cited by 26 publications

(6 citation statements)

References 35 publications

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“…With increasing TRS from 600 to 1800 rpm, the average grain-size is increased in NZ, and the denser grains are observed in NZ at 1400 rpm. A similar trend of average grain size with varying TRS was observed by Sharma et al, 71 Kumar et al, 72 and Jiang et al 76…”

Section: Resultssupporting

confidence: 85%

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Prediction of heat generation effect on force torque and mechanical properties at varying tool rotational speed in friction stir welding using Artificial Neural Network

Kumar

Triveni

Katiyar

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Friction stir welding (FSW) has played a significant role in joining aerospace alloys. During this process, the tool rotational (TRS) speed has been found to significantly affect heat generation compared to other parameters. Therefore, the study has investigated the effect of heat generation on force-torque and mechanical properties at different tool rotational speeds (TRS) in the FSW process through experimentation followed by Artificial Neural Network (ANN) technique. Further, the influence of different TRS ranging between 600 and 1800 rpm with an increment of 400 rpm on considered responses; namely thermal weld cycle, microstructure, and grain distribution in nugget zone (NZ) for 2050-T84 Al-Cu-Li alloy plates, welded using FSW were also investigated. It is observed that the vertically downward force (Z-force), longitudinal force (X-force), and spindle torque (Sp. T) decrease with increasing TRS. It is also observed an increasing (up to 1400 rpm) and then decreasing trend for tensile strength and hardness of welded samples. Moreover, the generation of frictional heat and grain size in NZ is increased with increasing TRS from 600 to 1800 rpm. However, the scanning electron microscope (SEM) micrographs of all-welded samples revealed a ductile mode of tensile fracture. Furthermore, the obtained experimental results were validated using the ANN technique. A quite better agreement has been established among the predicted outcomes from ANN with experimental results.

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Section: Resultssupporting

confidence: 85%

“…A similar trend of average grain size with varying TRS was observed by Sharma et al, 71 Kumar et al, 72 and Jiang et al 76…”

Section: Grain Size Distributionsupporting

confidence: 85%

Prediction of heat generation effect on force torque and mechanical properties at varying tool rotational speed in friction stir welding using Artificial Neural Network

Kumar

Triveni

Katiyar

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…For FSP in high strength aluminium alloy 7xxx series, heat input plays a crucial role on the resulting properties due to the dissolution of the strengthening precipitates during processing, which reduces the hardness and strength. This heat input also influences the grain growth and consequently grain refinement [8][9][10][11]. The higher heat input conditions during FSP accelerates the grain growth and eventually affects the grain refinement [12,13].…”

Section: Introductionmentioning

confidence: 99%

Through-thickness microstructure and mechanical properties in stationary shoulder friction stir processed AA7075

Patel

Liu

et al. 2019

Materials Science and Technology

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Stationary shoulder friction stir processing of high strength thick AA7075 aluminium alloy demonstrated tiny gradient in the microstructure refinement across the thickness, which was attributed to the less heat input and small temperature gradient by the stationary shoulder. Stationary shoulder produced a very smooth surface finish with a little amount of flash throughout the processing area. Probe-dominated stir zone (SZ) resulted in uniform grain refinement as well as hardness distribution across the SZ thickness. The ductility in SZ increased by 48% in comparison to the unprocessed material without costing tensile strength. This tensile behaviour trend maintained throughout the thickness in SZ. GRAPHICAL ABSTRACT

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“…The strengthening phase dissolves in the matrix, reducing the solid solution strengthening effect, resulting in a lower tensile strength of the joint than BM. 20,26 The stirring effect and thermal cycling effect of the upper layer are stronger, resulting in a stronger degree of dynamic recrystallization and enhanced deformation strengthening effect, so the tensile strength of the joints is significantly improved. The middle layer and the lower layer are relatively weakened by thermal coupling and deformation strengthening, resulting in a decrease in tensile strength.…”

Section: Results and Analysesmentioning

confidence: 99%

Microstructure and mechanical properties of FSW medium thickness 2219 aluminum alloy

Lü

Meng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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To achieve high-quality friction stir welding (FSW) of the rocket fuel tank, experiments of FSW 18 mm thick 2219 aluminum alloy are carried out, the microstructure and mechanical properties of the joints are studied, and the influence law of the tool rotation speed on microstructure, microhardness and tensile strength of the welded joints are explored. The welding speed used in the experiment is 100 mm/min, and the tool rotation speed is 350 r/min, 400 r/min and 450 r/min, respectively. The microstructure of the weldments is analyzed by optical microscopy and scanning electron microscopy. The mechanical properties are measured by tensile tests and Brinell hardness, and it is found that the mechanical properties of the joint first increased and then decreased with the increase of the tool rotation speed. Due to the uneven temperature distribution along the thickness direction of the weldment, the crystal grains in the nugget zone (NZ) are small equiaxed crystals as a whole, with different local sizes and shapes. The size of the crystal grains seems relatively large in the upper layer and relatively small in the bottom layer. As the tool rotation speed increases, so does the heat generation, and thus, the size and degree of the deformation of the crystal grains increase. The defect appears when the tool rotation speed is 450r/min. As the tool rotation speed increases, the tensile strength and microhardness of the joints increase first and then decrease. The maximum tensile strength of the overall weld is 270 MPa. The microhardness shows a trend of ‘‘U’’ distribution, and the hardness in the NZ is slightly higher than that of thermos-mechanically affected zone (TMAZ) and heat-affected zone (HAZ). The fracture location of the joints is the NZ. The fracture mode is ductile fracture. There exist a large number of second phase particles Al2Cu in the dimples.

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Mechanical and Damping Behavior of Age-Hardened and Non-age-hardened Al Alloys After Friction Stir Processing

Cited by 26 publications

References 35 publications

Prediction of heat generation effect on force torque and mechanical properties at varying tool rotational speed in friction stir welding using Artificial Neural Network

Prediction of heat generation effect on force torque and mechanical properties at varying tool rotational speed in friction stir welding using Artificial Neural Network

Through-thickness microstructure and mechanical properties in stationary shoulder friction stir processed AA7075

Microstructure and mechanical properties of FSW medium thickness 2219 aluminum alloy

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