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

  • Eiichi Sukedai , Takashi Yokoyama and Minghui Song
Published/Copyright: September 15, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 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

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https://doi.org/10.3139/146.111099
Keywords for this article
Bailey–Hirsch equation; Dislocation density; Dynamic recrystallization; Electron microscopy; Friction stir welding

Articles in the same Issue

  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
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  17. People
  18. People
  19. DGM News
  20. Personal
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