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Journal of Materials Science

, Volume 50, Issue 22, pp 7262–7270 | Cite as

Residual stress distribution and microstructure in the friction stir weld of 7075 aluminum alloy

  • Pengfei Ji
  • Zhongyu Yang
  • Jin ZhangEmail author
  • Lin Zheng
  • Vincent Ji
  • Vincent Klosek
Original Paper

Abstract

In order to study the relationship between residual stress (RS) and the microstructure of friction stir weld (FSW), RS profiles through thickness in the un-welded aluminum alloy 7075 plate and in middle layer of its FSW joint were determined nondestructively by the short-wavelength X-ray diffraction (SWXRD) and neutron diffraction. Microstructure and mechanical properties of the FSW joint were also studied by optical microscopic analysis, and microhardness and tensile strength measurements. RS profiles measured by the two methods had the same distribution trend. The maximum tensile RS tested by SWXRD and neutron diffraction in transverse and longitudinal direction occurred in the weld nugget. Microhardness in the direction perpendicular to the weld line showed a “W” shape distribution. Position of the local maximal extremum of RS in thermo-mechanically affected zone corresponded to that of minimal microhardness. The grain-refined strengthening caused by the recrystallization in the weld nugget kept the joint from fracturing at this region notwithstanding the maximum tensile RS. And the tensile fracture occurred near the boundary of welding zone and thermo-mechanically affected zone where minimum of hardness and maximum of RS appear at the same position.

Keywords

Welding Residual Stress Neutron Diffraction Friction Stir Welding Friction Stir Welding 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work is supported by the National Nature Science Foundation of China (Grant No. 51275037) and National 863 plans project of China (Grant No. 2009AA03Z539). The authors would like to thank the Laboratoire Léon Brillouin (LLB) for the allocation of beam time and China Friction Stirring Weld Center for assistance with the processing of the weldment.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Pengfei Ji
    • 1
  • Zhongyu Yang
    • 1
  • Jin Zhang
    • 1
    Email author
  • Lin Zheng
    • 2
  • Vincent Ji
    • 3
  • Vincent Klosek
    • 4
  1. 1.Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijingChina
  2. 2.Southwest Technology and Engineering Research InstituteChongqingChina
  3. 3.ICMMO/LEMHE, Universite Paris-Sud 11OrsayFrance
  4. 4.Laboratoire Léon Brillouin, CEA-SaclayGif-sur-Yvette CedexFrance

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