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Effects of the local microstructures on the mechanical properties in FSWed joints of a 7075-T6 Al alloy

  • Won-Bae Lee , Chang-Yong Lee , Yun-Mo Yeon and Seung-Boo Jung EMAIL logo
Published/Copyright: February 1, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 8

Abstract

The grain structure, dislocation density, and precipitate behavior in various regions including the dynamically recrystallized zone, the thermo-mechanically affected zone, and the heat-affected zone of a friction stir welded Al 7075-T6 were compared with those of the base metal. The mechanical properties of the friction stir weld zone were significantly affected by the microstructural issues. In the dynamically recrystallized zone, the grain structure was fine and equiaxed and the grains were separated by high-angle grain boundaries, which acted as obstacles for dislocation movement. The dislocation density was high and precipitates with diameters of about 70 nm were homogeneously distributed throughout the dynamically recrystallized zone. This zone showed the highest mechanical strength as measured by Vickers hardness and tensile tests. However, in the heat-affected zone the presence of coarsened grains and precipitates lead to failure during tensile tests. This zone had the lowest mechanical strength. The transversal tensile strength of the joints without weld defects attained 97% of that of the base metal with a tool rotation speed of 1600 rpm.

Keywords: Friction stir welding; 7075-T6 Al alloy; Mechanical properties; Grain structure; Precipitation; Dislocation
Prof. Seung-Boo Jung Department of Advanced Materials Engineering Sungkyunkwan University 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyounggi-do, 440-746, Korea Tel.: +82 31 290 7359 Fax: +82 31 290 7371

  1. This work was supported by the Korea Science and Engineering Foundation (KOSEF). One of the authors (Won-Bae Lee) appreciated the scholarship from KOSEF. Thanks to Dr. C. Dalle Donne and Dr. G. Staniek for research permission in the DLR (German Aero Spacecenter).

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Received: 2004-08-04
Accepted: 2005-01-23
Published Online: 2022-02-01

© 2005 Carl Hanser Verlag, München

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  5. Mechanical and electrical properties of Ti2SnC dispersion-strengthened copper
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  7. Thermodynamic assessment of Mg–Al–Mn phase equilibria, focusing on Mg-rich alloys
  8. DSC study on the phase decomposition of an Al–Cu alloy occurring during annealing at 403 K
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  10. Thermodynamic assessment of the ternary Cu–Pb–O system
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  18. Stretch-zone analysis by image processing for the evaluation of initiation fracture toughness of a HSLA steel
  19. Copper-lithium alloy produced by powder metallurgy procedures and its age-hardening response
  20. Effects of the local microstructures on the mechanical properties in FSWed joints of a 7075-T6 Al alloy
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  22. Notifications/Mitteilungen
  23. Personal/Personelles
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https://doi.org/10.3139/ijmr-2005-0162
Keywords for this article
Friction stir welding; 7075-T6 Al alloy; Mechanical properties; Grain structure; Precipitation; Dislocation

Articles in the same Issue

  1. Frontmatter
  2. Articles Basic
  3. Diffusion in molybdenum disilicide
  4. Martensitic transformation, ductility, and shape-memory effect of polycrystalline Ni56Mn25 – xFexGa19 alloys
  5. Mechanical and electrical properties of Ti2SnC dispersion-strengthened copper
  6. Thermodynamic and phase relation study of the Ni–Ge –O system in the solid state
  7. Thermodynamic assessment of Mg–Al–Mn phase equilibria, focusing on Mg-rich alloys
  8. DSC study on the phase decomposition of an Al–Cu alloy occurring during annealing at 403 K
  9. Structure and thermal stability of a melt-quenched single-phase nanocrystalline Hf61Fe39 alloy
  10. Thermodynamic assessment of the ternary Cu–Pb–O system
  11. Combined EELS, EDX, and STEM investigations of Cu-induced nanostrucutures and thin surface layer phases
  12. Articles Applied
  13. Fatigue failure of titanium implants for mandibular reconstruction
  14. Solid state reaction mechanism for the synthesis of La1 – xSrxCoO3–δ (0.1 ≤ x ≤ 0.7)
  15. Dislocation structures in 16MND5 pressure vessel steel strained in uniaxial tension at –196 °C
  16. Microstructure of AZ91 alloy deformed by equal channel angular pressing
  17. The effect of copper on secondary phase precipitation in duplex stainless steel – a thermodynamic calculations approach
  18. Stretch-zone analysis by image processing for the evaluation of initiation fracture toughness of a HSLA steel
  19. Copper-lithium alloy produced by powder metallurgy procedures and its age-hardening response
  20. Effects of the local microstructures on the mechanical properties in FSWed joints of a 7075-T6 Al alloy
  21. Estimating ternary surface tension for systems with limited solubility
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. News/Aktuelles
  25. Conferences/Konferenzen
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