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Microstructural comparison of friction-stir-welded aluminum alloy 7449 starting from different tempers

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Abstract

Since friction stir welding (FSW) does not create defects that are normally associated with fusion welds, it has become the preferred method for joining aluminum 7XXX series alloys. This work analyzes and compares friction stir welds of two different tempers in aluminum alloy 7449. A thorough analysis was done to characterize the two as-received alloys. Weld parameters were kept identical for the two different starting tempers. Thermocouples were used in the heat-affected zone at three different depths to obtain experimental thermal profiles. Hardness traverses and differential scanning calorimetry were used to analyze the strength of the welds and to analyze precipitate evolution. Simulated thermal profiles were generated via finite element analysis for the weld centerline. Our analysis confirms that preexisting precipitates in the as-received material have an effect on the final microstructure of the welds. A highly overaged aluminum 7449 alloy responds better to FSW as compared to a slightly overaged aluminum 7449 alloy.

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References

  1. Kamp N, Sullivan A, Robson JD (2007) Modelling of friction stir welding of 7xxx aluminum alloys. Mater Sci Eng A 466(1):246–255

    Article  Google Scholar 

  2. Kamp N, Sullivan A, Tomasi R, Robson JD (2006) Modelling of heterogeneous precipitate distribution evolution during friction stir welding process. Acta Mater 54(8):2003–2014

    Article  Google Scholar 

  3. Mishra RS, Ma ZY (2005) Friction stir welding and processing. Mater Sci Eng R 50(1):1–78

    Article  Google Scholar 

  4. Mishra RS, De PS, Kumar N (2014) Friction stir welding and processing: science and engineering. Springer, Berlin

    Book  Google Scholar 

  5. Mishra RS, Mahoney MW (2007) Friction stir welding and processing. ASM International, Materials Park

    Google Scholar 

  6. Sullivan A, Robson JD (2008) Microstructural properties of friction stir welded and post-weld heat-treated 7449 aluminum alloy thick plate. Mater Sci Eng A 478(1):351–360

    Article  Google Scholar 

  7. Su J, Nelson TW, Sterling CJ (2005) Microstructure evolution during FSW/FSP of high strength aluminum alloys. Mater Sci Eng A 405:277–286

    Article  Google Scholar 

  8. Fuller CB, Mahoney MW, Calabrese M, Micona L (2010) Evolution of microstructure and mechanical properties in naturally aged 7050 and 7075 Al friction stir welds. Mater Sci Eng A 527(9):2233–2240

    Article  Google Scholar 

  9. Dumont M, Steuwer A, Deschamps A, Peel M, Withers PJ (2006) Microstructure mapping in friction stir welds of 7449 aluminum alloy using SAXS. Acta Mater 54(18):4793–4801

    Article  Google Scholar 

  10. Upadhyay P, Reynolds A (2014) Effect of backing plate thermal property on friction stir welding of 25-mm-thick AA6061. Metall Mater Trans A 45(4):2091–2100

    Article  Google Scholar 

  11. Upadhyay P, Reynolds AP (2015) Thermal management in friction-stir welding of precipitation-hardened aluminum alloys. JOM 67(5):1022–1031

    Article  Google Scholar 

  12. Rhodes CG, Mahoney MW, Bingel WH, Calabrese M (2003) Fine-grain evolution in friction-stir processed 7050 aluminum. Scr Mater 48(10):1451–1455

    Article  Google Scholar 

  13. Martinez N, Kumar N, Mishra R, Doherty KJ (2017) Effect of tool dimensions and parameters on the microstructure of friction stir welded aluminum 7449 alloy of various thicknesses. Mater Sci Eng A 684:470–479

    Article  Google Scholar 

  14. Martinez N, Kumar N, Mishra R, Doherty KJ (2017) Microstructural variation due to heat gradient of a thick friction stir welded aluminum 7449 alloy. J Alloys Compd 713:51–63

    Article  Google Scholar 

  15. Li X, Starink M (2012) DSC study on phase transitions and their correlation with properties of overaged Al–Zn–Mg–Cu alloys. J Mater Eng Perform 21:977–984

    Google Scholar 

  16. Kamp N, Sinclair I, Starink MJ (2002) Toughness-strength relations in the overaged 7449 Al-based alloy. Metall Mater Trans A 33(4):1125

    Article  Google Scholar 

  17. Piela K, Błaz L, Sierpinski Z, Forys T (2012) Non-isothermal annealing of AA7075 aluminum alloy—structural and mechanical effects. Arch Metall Mater 57(3):703–709

    Article  Google Scholar 

  18. Farè S, Lecis N, Vedani M (2011) Aging behaviour of Al–Mg–Si alloys subjected to severe plastic deformation by ECAP and cold asymmetric rolling. J Metall 2011:1–8

    Article  Google Scholar 

  19. Deschamps A, Livet F, Brechet Y (1998) Influence of predeformation on ageing in an Al–Zn–Mg alloy-I. Microstructure evolution and mechanical properties. Acta Mater 47:281–292

    Article  Google Scholar 

  20. Yang W, Ji S, Wang M, Li Z (2014) Precipitation behaviour of Al–Zn–Mg–Cu alloy and diffraction analysis from η′ precipitates in four variants. J Alloys Compd 610:623–629

    Article  Google Scholar 

  21. Nandan R et al (2007) Three-dimensional heat and material flow during friction stir welding of mild steel. Acta Mater 55(3):883–895

    Article  Google Scholar 

  22. Song M, Kovacevic R (2003) Thermal modeling of friction stir welding in a moving coordinate system and its validation. Int J Mach Tools Manuf 43(6):605–615

    Article  Google Scholar 

  23. Khandkar MZH, Khan JA, Reynolds AP (2003) Prediction of temperature distribution and thermal history during friction stir welding: input torque based model. Sci Technol Weld Join 8(3):165–174

    Article  Google Scholar 

  24. Frigaard Ø, Grong Ø, Midling OT (2001) A process model for friction stir welding of age hardening aluminum alloys. Metall Mater Trans A 32(5):1189–1200

    Article  Google Scholar 

  25. Chao YJ, Qi X, Tang W (2003) Heat transfer in friction stir welding—experimental and numerical studies. J Manuf Sci Eng Trans ASME 125(1):138–145

    Article  Google Scholar 

  26. Shercliff HR, Colegrove PA (2002) Modelling of friction stir welding. In: Mathematical modelling of weld phenomena, vol 6. Maney Publishing, pp 927–974

  27. Schmidt H, Hattel J, Wert J (2004) An analytical model for the heat generation in friction stir welding. Modell Simul Mater Sci Eng 12(1):143–157

    Article  Google Scholar 

  28. Palanivel S, Arora A, Mishra R, Doherty KJ (2016) A framework for shear driven dissolution of thermally stable particles during friction stir welding and processing. Mater Sci Eng A 678:308–314

    Article  Google Scholar 

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Authors and Affiliations

  1. Center for Friction Stir Processing, Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    N. Martinez, N. Kumar & R. S. Mishra

  2. Weapons and Materials Research Directorate, U.S. Army Research Laboratory, Aberdeen Proving Grounds, MD, 21005, USA

    K. J. Doherty

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  1. N. Martinez
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  2. N. Kumar
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  3. R. S. Mishra
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  4. K. J. Doherty
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Correspondence to R. S. Mishra.

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Martinez, N., Kumar, N., Mishra, R.S. et al. Microstructural comparison of friction-stir-welded aluminum alloy 7449 starting from different tempers. J Mater Sci 53, 9273–9286 (2018). https://doi.org/10.1007/s10853-018-2201-z

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  • DOI: https://doi.org/10.1007/s10853-018-2201-z

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