Startseite Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
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Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy

  • Eiichi Sukedai , Takashi Yokoyama und Minghui Song
Veröffentlicht/Copyright: 15. September 2014
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 105 Heft 9

Abstract

The present paper describes correlations between microstructure and tensile properties of a friction stir (FS) welded Al–Mg–Si alloy (6061–T6 Al). Mechanical tests were performed to determine the hardness and tensile stress–strain properties for the base material and for the nugget (or stirred) zone in the FS weld. The microstructure in the nugget zone was characterized using a weak-beam technique, high-resolution electron microscopy, and scanning transmission electron microscopy. Reduction of flow stress in the nugget zone was caused by thermal softening of the base material during the friction stir welding (FSW) process. Fine needle-like precipitates, dislocation segments, and fine lattice defects were observed in the base material, while only isolated long dislocations were found in the nugget zone. These results suggest that dynamic recrystallization occurs during FSW. Deterioration of tensile properties in the nugget zone was caused by the annihilation of lattice defects formed during the thermal refining process. The strain-hardening rate of the nugget zone was higher than that of the base material, and this was caused by a simple dislocation multiplication due to the dynamic recrystallization of the base material.

Keywords: Bailey–Hirsch equation; Dislocation density; Dynamic recrystallization; Electron microscopy; Friction stir welding
* Correspondence address, Prof. Eiichi Sukedai, Department of Mechanical Engineering, Okayama University of Science, Okayama 700-0005, Japan, Tel.: +81-080-9797-1642, Fax: +81-86-255-3611, E-mail:

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Received: 2013-11-04
Accepted: 2014-02-27
Published Online: 2014-09-15
Published in Print: 2014-09-15

© 2014, Carl Hanser Verlag, München

Artikel in diesem Heft

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  2. Contents
  3. Original Contributions
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  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
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  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
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https://doi.org/10.3139/146.111099
Schlagwörter für diesen Artikel
Bailey–Hirsch equation; Dislocation density; Dynamic recrystallization; Electron microscopy; Friction stir welding

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Diffusivities and atomic mobilities of an Sn–Ag–Bi–Cu–Pb melt
  5. Experimental study of the phase relations in the Fe–Cr–Si ternary system at 700°C
  6. Effect of molybdenum on the microstructure, mechanical properties and corrosion behavior of Ti alloys
  7. Mechanism of grain refinement and coarsening in undercooled Ni–Fe alloy
  8. Effects of copper content and liquid separation on the microstructure formation of Co–Cu immiscible alloys
  9. Influence of the solidification temperature range on Gasar structures made from Cu–Mn alloys
  10. Effect of ageing time on mechanical properties and tribological behaviour of aluminium hybrid composite
  11. Microstructure and tensile properties of a friction stir welded Al–Mg–Si alloy
  12. Lüders effect in Al 99.7% extruded via the KoBo method
  13. Reduced graphene oxide nanocomposites with different diameters and crystallinity of TiO2 nanoparticles – synthesis, characterization and photocatalytic activity
  14. Constitutive modelling of mill loads during hot rolling of AISI 321 austenitic stainless steel
  15. X-ray stress measurement with two-dimensional detector based on Fourier analysis
  16. People
  17. People
  18. People
  19. DGM News
  20. Personal
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