Skip to main content
SpringerLink
Log in

The Effects of Rotational Speed on Microstructure and Mechanical Properties of Friction Stir-Welded 7075-T6 Thin Sheet

  • Published:
Journal of Materials Engineering and Performance Aims and scope Submit manuscript

Abstract

In the present research, the effects of friction stir welding (FSW) on the microstructure of 7075-T6 aluminum alloy (AA) thin sheet were investigated. For this purpose, three different welding rotational speeds of 600, 1000 and 1600 rpm at the constant traverse speed of 50 mm/min were studied. It was observed that FSW of an AA7075 thin sheet leads to an irrecoverable drastic reduction in the tensile properties. However, it was proven that for a thin sheet, at different rotational speeds, totally very different mechanisms of microstructural evolution were present within the stir zone (SZ). Also, it was observed that the mean grain size and subgrain density of the SZ have a nonlinear relation with rotational speed. Electron backscattered diffraction analysis indicated that continuous and discontinuous dynamic recrystallization is present within SZ simultaneously as the mechanisms of grain refinement, but with different effects. It was confirmed that heat input of the welding process in FSW of a thin sheet has a negligible effect on the microstructure, although the plastic strain is the determinant parameter. Also, the relationship between the microstructural observations and mechanical properties of friction stir-welded AA7075-T6 is discussed.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

References

  1. L. Dubourg, A. Merati, and M. Jahazi, Process Optimisation and Mechanical Properties of Friction Stir Lap Welds of 7075-T6 Stringers on 2024-T3 Skin, Mater. Des., 2010, 31, p 3324–3330

    Article  CAS  Google Scholar 

  2. G. Mathers, The Welding of Aluminium and Its Alloys, Woodhead Publishing, Cambridge, 2002

    Book  Google Scholar 

  3. R.S. Mishra and Z. Ma, Friction Stir Welding and Processing, Mater. Sci. Eng.: R: Rep., 2005, 50, p 1–78

    Article  Google Scholar 

  4. R.S. Mishra and M.W. Mahoney, Friction Stir Welding and Processing, ASM International, Cleveland, 2007

    Google Scholar 

  5. A. Arora, A. De, and T. DebRoy, Toward Optimum Friction Stir Welding Tool Shoulder Diameter, Scr. Mater., 2011, 64, p 9–12

    Article  CAS  Google Scholar 

  6. S.M. Mousavizade, F.M. Ghaini, M.J. Torkamany, J. Sabbaghzadeh, and A. Abdollah-zadeh, Effect of Severe Plastic Deformation on Grain Boundary Liquation of a Nickel–Base Superalloy, Scr. Mater., 2009, 60, p 244–247

    Article  CAS  Google Scholar 

  7. M.W. Mahoney, C.G. Rhodes, J.G. Flintoff, R.A. Spurling, and W.H. Bingel, Properties of Friction-Stir-Welded 7075 T651 Aluminum, Metall. Mater. Trans. A, 1998, 29A, p 1955–1964

    Article  CAS  Google Scholar 

  8. K.V. Jata, K.K. Sankaran, and J.J. Ruschau, Friction-Stir Welding Effects on Microstructure and Fatigue of Aluminum Alloy 7050-T7451, Metall. Mater. Trans. A, 2000, 31, p 2181–2192

    Article  Google Scholar 

  9. S. Rajakumar, C. Muralidharan, and V. Balasubramanian, Influence of Friction Stir Welding Process and Tool Parameters on Strength Properties of AA7075-T6 Aluminium Alloy Joints, Mater. Des., 2011, 32, p 535–549

    Article  CAS  Google Scholar 

  10. C.G. Rhodes, M.W. Mahoney, W.H. Bingel, R.A. Spurling, and C.C. Bampton, Effects of Friction Stir Welding on Microstructure of 7075 Aluminum, Scr. Mater., 1997, 36, p 69–75

    Article  CAS  Google Scholar 

  11. C.B. Fuller, M.W. Mahoney, M. Calabrese, and L. Micona, Evolution of Microstructure and Mechanical Properties in Naturally Aged 7050 and 7075 Al Friction Stir Welds, Mater. Sci. Eng., A, 2010, 527, p 2233–2240

    Article  Google Scholar 

  12. A. Goloborodko, T. Ito, X. Yun, Y. Motohashi, and G. Itoh, Friction Stir Welding of a Commercial 7075-T6 Aluminum Alloy: Grain Refinement, Thermal Stability and Tensile Properties, Mater. Trans., 2004, 45, p 2503–2508

    Article  CAS  Google Scholar 

  13. Y. Motohashi, T. Sakuma, A. Goloborodko, T. Ito, and G. Itoh, Grain Refinement Process in Commercial 7075-T6 Aluminum Alloy Under Friction Stir Welding and Superplasticity, Materialwiss. Werkstofftech., 2008, 39, p 275–278

    Article  CAS  Google Scholar 

  14. J.P. Holman, Heat Transfer, 10th ed., McGraw-Hill Education, Singapore, 2009

    Google Scholar 

  15. T. Long, W. Tang, and A.P. Reynolds, Process Response Parameter Relationships in Al Alloy Friction Stir Welds, Sci. Technol. Weld. Join., 2007, 12, p 311–317

    Article  CAS  Google Scholar 

  16. F. Gemme, Y. Verreman, L. Dubourg, and P. Wanjara, Effect of Welding Parameters on Microstructure and Mechanical Properties of AA7075-T6 Friction Stir Welded Joints, Fatigue Fract. Eng. Mater. Struct., 2011, 34, p 877–886

    Article  CAS  Google Scholar 

  17. J.-Q. Su, T.W. Nelson, and C.J. Sterling, Microstructure Evolution During FSW/FSP of High Strength Aluminum Alloys, Mater. Sci. Eng., A, 2005, 405, p 277–286

    Article  Google Scholar 

  18. J.-Q. Su, T.W. Nelson, and C.J. Sterling, Friction Stir Processing of Large-Area Bulk UFG Aluminum Alloys, Scr. Mater., 2005, 52, p 135–140

    Article  CAS  Google Scholar 

  19. N. Haghdadi, A. Zarei-Hanzaki, and D. Abou-Ras, Microstructure and Mechanical Properties of Commercially Pure Aluminum Processed by Accumulative Back Extrusion, Mater. Sci. Eng., A, 2013, 584, p 73–81

    Article  CAS  Google Scholar 

  20. Friction stir welding, From Basics to Applications, CRC Press Woodhead Publishing Limited and CRC Press LLC, Washington, DC, 2010

    Google Scholar 

  21. O. Hatamleh and A. DeWald, An Investigation of the Peening Effects on the Residual Stresses in Friction Stir Welded 2195 and 7075 Aluminum Alloy Joints, J. Mater. Process. Technol., 2009, 209, p 4822–4829

    Article  CAS  Google Scholar 

  22. X. He, F. Gu, and A. Ball, A Review of Numerical Analysis of Friction Stir Welding, Prog. Mater Sci., 2014, 65, p 1–66

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Materials Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran

    Ali Mehri & Amir Abdollah-zadeh

  2. Department of Metallurgy and Materials Engineering, University of Tehran, P.O. Box 11365-4563, Tehran, Iran

    Niloufar Habibi

  3. Department of Materials Science and Engineering, Shahrood University of Technology, P.O. Box 36199-95161, Shahrood, Iran

    Mostafa Hajian

  4. School of Materials Science and Engineering, Nanjing University of Science and Technology, P.O. Box 210094, Nanjing, China

    Jing Tao Wang

Authors
  1. Ali Mehri
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Amir Abdollah-zadeh
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Niloufar Habibi
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Mostafa Hajian
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Jing Tao Wang
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Amir Abdollah-zadeh.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Mehri, A., Abdollah-zadeh, A., Habibi, N. et al. The Effects of Rotational Speed on Microstructure and Mechanical Properties of Friction Stir-Welded 7075-T6 Thin Sheet. J. of Materi Eng and Perform 29, 2316–2323 (2020). https://doi.org/10.1007/s11665-020-04733-w

Download citation

  • Received:

  • Revised:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11665-020-04733-w

Keywords

Search

Navigation