Unveiling the microstructure evolution and mechanical properties of submerged friction stir welded joint of fine-grained NiCoCr medium entropy alloy

Huang, Guoqiang; Chou, Tse-Heng; Liu, S.F.; Xiao, Bing; Ju, J.; Gan, J.; Yang, Tié; Zhang, P.; Yang, Jinxue; Lu, Chenyang; Meng, Fanqiang

doi:10.1016/j.matchar.2023.112903

Cited by 14 publications

References 40 publications

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Effect of a novel pin tool with large diameter disc on the microstructure and mechanical properties of Al/Mg dissimilar friction stir lap joint

Jiang,

Hu,

Shen

et al. 2024

Int J Adv Manuf Technol

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In this paper, a novel friction stir welding tool with shoulder at the top of the needle is developed to solve the problems in aluminum/magnesium friction stir lap welding. Based on the structural design of the shoulder at the end of the needle, the temperature difference in the thickness direction of the joint was coordinated, and the aluminum-magnesium dissimilar lapping joint was successfully prepared in two kinds of lapping methods. Taking die cast AZ31B magnesium alloy and extruded 6061 aluminum alloy as the research object, the defects and microstructure of weld joint were observed and analyzed by optical microscope and scanning electron microscope. Additionally, their mechanical properties were also evaluated. The results show that a good metallurgical reaction is formed between aluminum and magnesium, and with the increase of the effective plate thickness and the decrease of the effective lap width, the unique hook defect shape of lap welding is optimized, which also promotes the improvement of the mechanical properties of the weld. In the tensile shear experiment, it is found that the tensile shear property is improved due to the change of the shape of the hook defect, and it is a mixed fracture of toughness and brittleness.

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Effect of a novel pin tool with large diameter disc on the microstructure and mechanical properties of Al/Mg dissimilar friction stir lap joint

Jiang,

Hu,

Shen

et al. 2024

Int J Adv Manuf Technol

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Dynamic recrystallization mechanism, grain structure evolution, and mechanical behavior in friction stir welding of galvanized steel at different cooling rates

Sun,

Wu,

Yang

et al. 2024

Int J Adv Manuf Technol

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The welded joints of galvanized steel were created by friction stir welding (FSW) with different cooling rate employing a W-Re rotary tool with a large diameter needle. The microstructure evolution was studied by optical microscopy, scanning electron microscopy, and electron backscatter diffraction. The results demonstrate that the microstructural evolution mechanism of the stirring zone is discontinuous dynamic recrystallization at fast cooling rate, while the microstructure has continuous dynamic recrystallization as the primary evolution mechanism at slow cooling rate. In addition, fast cooling is more favorable to the re nement of the organization, weakening of the texture, uniform distribution of dislocations and diffusion precipitation of Fe3C. Based on this, the tensile specimens prepared at the fast cooling rate exhibited yield and fracture strengths exceeding those of the base material with less plasticity loss.

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Developing Ultrafine Twinned Microstructure Enabled Excellent Strength–Ductility Synergy in Mg–Al–Zn Alloy by Submerged Friction Stir Processing

Sun,

Cao,

et al. 2023

Metall Mater Trans A

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Unveiling the microstructure evolution and mechanical properties of submerged friction stir welded joint of fine-grained NiCoCr medium entropy alloy

Cited by 14 publications

References 40 publications

Effect of a novel pin tool with large diameter disc on the microstructure and mechanical properties of Al/Mg dissimilar friction stir lap joint

Effect of a novel pin tool with large diameter disc on the microstructure and mechanical properties of Al/Mg dissimilar friction stir lap joint

Dynamic recrystallization mechanism, grain structure evolution, and mechanical behavior in friction stir welding of galvanized steel at different cooling rates

Developing Ultrafine Twinned Microstructure Enabled Excellent Strength–Ductility Synergy in Mg–Al–Zn Alloy by Submerged Friction Stir Processing

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