Effect of the Post-weld Heat Treatments on Mechanical and Corrosion Properties of Friction Stir-Welded AA 7075-T6 Aluminium Alloy

  • S. B. PankadeEmail author
  • P. M. Ambad
  • R. Wahane
  • C. L. Gogte
Conference paper
Part of the Lecture Notes on Multidisciplinary Industrial Engineering book series (LNMUINEN)


Age hardenable, high-strength aluminium alloys are used majorly in aerospace, defence, marine and automobile components because of their excellent strength-to-weight ratio and better corrosion resistance. To join such nonferrous alloys, friction stir welding (FSW) is a special technique, which uses the phenomenon of friction and deformation while joining in the solid state. The joint sections of 2XXX, 6XXX and 7XXX series of aluminium alloys are susceptible to microstructural changes during FSW due to their ageing characteristics. These changes further aggravate the problem of mechanical engineering properties, and especially the corrosion resistance of these alloys. In the present work, focus is kept on the effect of post-weld heat treatments (PWHT) such as retrogression and re-ageing (RRA) and stabilization with double ageing (SDA) on mechanical properties, electrical conductivity and exfoliation corrosion resistance of AA 7075 aluminium alloy FSW joints.


Friction stir welding AA7075 PWHT Exfoliation corrosion RRA SDA Electrical conductivity 



The authors are grateful to Dr. Dilip Peshwe, Professor, Department of Metallurgy and Materials Engineering, VNIT, Nagpur and Center of Excellence of Metallurgy and Materials Engineering, MIT Aurangabad for providing support to carry out the characterization.


  1. 1.
    Bahemmat, P., Haghpanahi, M., Besharati, M.K., Ashanizadeh, S., Rezaei, H.: Study on mechanical, micro and microstructural characteristics of dissimilar friction stir welding of AA6061-T6 and AA 7075-T6. Proc. Inst. Mech. Eng. Part B: J. Eng. Manuf. 224, 1854–1865 (2010)CrossRefGoogle Scholar
  2. 2.
    Cam, G., Mistikoglu, S.: Recent developments in friction sir welding of Al alloys. J. Mater. Eng. Perform. 23(6), 1936–1953 (2014)CrossRefGoogle Scholar
  3. 3.
    Cerri, E.: Effect of post-welding heat treatments on mechanical properties of double lap FSW joints in high strength aluminium alloys. Metall. Sci. Technol. 29–1, 32–39 (2011)Google Scholar
  4. 4.
    Elangovan, K., Balasubramanian, V.: Influences of post-weld heat treatment on tensile properties of friction stir-welded AA6061 aluminium alloy joints. Mater. Charact. 59, 1168–1177 (2008)CrossRefGoogle Scholar
  5. 5.
    Enomoto, M.: Friction stir welding: research and industrial applications. Weld. Int. 17(5), 341–345 (2003)CrossRefGoogle Scholar
  6. 6.
    Guo-sheng, P., Kang-hua, C., Song-yi, C., Hua-chan, F.: Influence of dual retrogression and re-aging temper on microstructure, strength and exfoliation corrosion behavior of Al-Zn-Mg-Cu alloy. Trans. Nonferrous Met. Soc. China 22, 803–809 (2012)CrossRefGoogle Scholar
  7. 7.
    Hassan, K.A.A., Prangnell, P.B., Norman, A.F., Price, D.A., Williams, S.W.: Effect of welding parameters on nugget zone microstructure and properties in high strength aluminium alloy friction stir welds. Sci. Technol. Weld. Joining 8(4), 257–268 (2003)CrossRefGoogle Scholar
  8. 8.
    Ipekoglu, G., Erim, S., Cam, G.: Investigation of the effect of temper condition and post weld heat treatment on the microstructure and mechanical properties of friction stir butt welded AA 7075 Al alloy plates. Int. J. Adv. Manuf. Technol. 70, 201–213 (2015)CrossRefGoogle Scholar
  9. 9.
    Isadare, A.D., Aremo, B., Adeoye, M.O., Olawale, O.J., Shittu, M.D.: Effect of heat treatment on some mechanical properties of 7075 aluminium alloy. Mater. Res. 16(1), 190–194 (2013)CrossRefGoogle Scholar
  10. 10.
    Jasthi, B.K., Klinckman, E., Curtis, T., Widener, C., West, M., Ruokolainen, R.B., Dasgupta, A.: Effect of post-weld aging on the corrosion resistance and mechanical properties of friction stir welded aluminium alloys 7475-T73. In: Friction Stir Welding and Processing VIITMS, The Minerals, Metals & Materials Society, pp. 225–234 (2013)Google Scholar
  11. 11.
    Kumar, P.V., Reddy, M.G., Rao, S.K.: Effect of post weld heat treatments on mechanical and stress corrosion cracking behaviour of AA 7075 friction stir welds. Int. J. u- e-Serv. Sci. Technol. 7(4), 251–262 (2014)CrossRefGoogle Scholar
  12. 12.
    Kumar, P.V., Reddy, M.G., Rao, S.K.: Microstructure, mechanical and corrosion behaviour of high strength AA7075 aluminium alloy friction stir welds—effect of post weld heat treatment. Def. Technol. 11, 362–369 (2015)CrossRefGoogle Scholar
  13. 13.
    Lumsden, J.B., Mahoney, M.W., Pollock, G., Rhodes, C.G.: Intergranular corrosion following friction stir welding of aluminum alloy 7075-T651. Corrosion 55(12), 1127–1135 (1999)CrossRefGoogle Scholar
  14. 14.
    Mahoney, M.W., Rohdes, C.G., Flintoff, J.G., Bingel, W.H., Spurling, R.A.: properties of friction-stir welded 7075 T651 aluminum. Metall. Mater. Trans. A 29(7), 1955–1964 (1998)CrossRefGoogle Scholar
  15. 15.
    Miller, W.S., Zhuang, L., Bottema, J., Wittebrood, A.J., De Smet, P., Haszler, A., Vieregge, A.: Recent development in aluminum alloys for the automotive industry. Mater. Sci. Eng. A 280, 37–49 (2000)CrossRefGoogle Scholar
  16. 16.
    Mishra, R.S., Ma, Z.Y.: Friction stir welding and processing. Mater. Sci. Eng. R 50, 1–78 (2005)CrossRefGoogle Scholar
  17. 17.
    Mohammadi-pour, M., Khodabandeh, A., Mohammadi-pour, S., Paidar, M.: Microstructure and mechanical properties of joints welded by friction-stir welding in aluminum alloy 7075-T6 plates for aerospace application. Rare Met. 1–9 (2016).
  18. 18.
    Patil, S., Gogte, C.L.: On thermal effects in the weld zone of friction stir welded joint of age hardenable AA 7075 alloy. In: 7th Asia Pacific IIW International Congress, Singapore, ICRA-2013-SING.235, IIW (2013) Google Scholar
  19. 19.
    Petter, G.E., Figert, J.D., Rybicki, D.J., Burns, T.H.: Heat treatment of friction stir welded 7X50 aluminium. U.S. Patent 6 802 441 B1, 12 Oct 2004 (2004)Google Scholar
  20. 20.
    Polmear, I.: Light Alloys: From Traditional Alloys to Nanocrystals, 4th edn. Elsevier, ‎Amsterdam (2006)Google Scholar
  21. 21.
    Rafi, K.H., Janaki Ram, G.D., Phanikumar, G., Rao, P.K.: Microstructure and tensile properties of friction stir welded aluminium alloy AA7075-T6. Mater. Design 31, 2375–2380 (2010)CrossRefGoogle Scholar
  22. 22.
    Rajakumar, S., Muralidharan, C., Balasubramanian, V.: Influence of friction stir welding process and tool parameters on strength properties of AA7075-T6 aluminium alloy joints. Mater. Design 1–15 (2010)Google Scholar
  23. 23.
    Rhodes, C.G., Mahoney, M.W., Bingel, W.H., Spurling, R.A., Bampton, W.H.: Effects of friction stir welding on microstructure of 7075 aluminium. Scripta Mater. 36(1), 69–75 (1997)CrossRefGoogle Scholar
  24. 24.
    Santos, T.G., Miranda, R.M., Vilaca, P., Teixeira, J.P.: Modification of electrical conductivity by friction stir processing of aluminum alloys. Int. J. Adv. Manuf. Technol. 57, 511–519 (2011)CrossRefGoogle Scholar
  25. 25.
    Santos, T.G., Miranda, R.M., Vilaca, P., Teixeira, J.P., dos Santos, J.: Microstructural mapping of friction stir welding AA 7075-T6 and AlMgSc alloys using electrical conductivity. Sci. Technol. Weld. Joining 16(7), 630–635 (2011)CrossRefGoogle Scholar
  26. 26.
    Sivaraj, P., Kanagarajan, D., Balasubramanian, V.: Effect of post weld heat treatments on tensile properties and microstructure characteristics of friction stir welded armour grade AA 7075-T651 aluminium alloy. Def. Technol. 10, 1–8 (2014)CrossRefGoogle Scholar
  27. 27.
    Su, J.Q., Nelson, T.W., Mishra, R.S., Mahoney, M.W.: Microstructural investigation of friction stir welded 7050-T651 aluminum. Acta Mater. 51, 713–719 (2005)CrossRefGoogle Scholar
  28. 28.
    Thomas, W.M., Nicholas, E.D., Needham, J.C., Smith, P.J., Kallee, S.W., Dewas, C.: Friction stir welding. UK Patent Publication, GB 2.306 266 (1995)Google Scholar
  29. 29.
    Thomas, W.M., Staines, D.G., Norris, I.M., de Frias, R.: Friction stir welding tools and developments. Weld. World 47(11–12), 10–17 (2003)CrossRefGoogle Scholar
  30. 30.
    Tsai, T.C., Chuang, T.H.: Relationship between electrical conductivity and stress corrosion cracking susceptibility of Al 7075 and Al 7475 alloys. Corrosion 52(6), 414–416 (1996)CrossRefGoogle Scholar
  31. 31.
    Venugopal, T., Rao, S.K., Rao, P.K.: Studies on friction stir welded AA 7075 aluminium alloys. Trans. Indian Inst. Met. 57(6), 659–663 (2004)Google Scholar
  32. 32.
    Yani, C., Sayer, S., Ertugrul, O., Pakdil, M.: Effect of post-weld aging on the mechanical and microstructural properties of friction stir welded aluminium alloy 7075. Arch. Mater. Sci. Eng. 34(2), 105–109 (2008)Google Scholar
  33. 33.
    Zaid, H.R., Hatab, A.M., Ibrahim, A.M.A.: Properties enhancement of Al-Zn-Mg alloy by retrogression and re-aging heat treatment. J. Min. Metall. B: Metall. 47(1), 31–35 (2011)CrossRefGoogle Scholar

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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • S. B. Pankade
    • 1
    Email author
  • P. M. Ambad
    • 1
  • R. Wahane
    • 1
  • C. L. Gogte
    • 1
  1. 1.Department of Mechanical EngineeringMarathwada Institute of TechnologyAurangabadIndia

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