Skip to main content
SpringerLink
Log in

The Effect of the Surface Treating and High-Temperature Aging on the Strength and SCC Susceptibility of 7075 Aluminum Alloy

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

Abstract

A novel heat-treatment procedure combining the shot-peening with a two-step aging operation was proposed to improve both the strength and the stress corrosion cracking (SCC) resistance of the high-strength 7075 aluminium alloy. The heat treatment included one shot-peening stage before or between the two stages of aging at 120 °C for 24 h and at 160 °C for 1 h, respectively. The mechanical properties obtained during the aforementioned operations were extremely similar to those of the T6 sample owing to the unaffected bulk microstructure over such a low over-aging period. The SCC resistance of these samples was considerably improved compared to that of the T6 sample and of the conventional shot-peened T6 sample due to the over-aging of the surface like the T7 treatment leading from the diffusion acceleration by the dislocations generated in the surface layer during shot-peening. In spite of the further depth of deformation caused by shot-peening prior to the first step of aging, the sample shot-peened after the first step of aging showed no significant decrease in the SCC resistance because of its higher generated dislocation by shot-peening.

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

Similar content being viewed by others

References

  1. J.E. Hatch, Ed., Aluminum Properties and Physical Metallurgy, American Society for Metals, OH, 1984

    Google Scholar 

  2. G. Sha and A. Cerezo, Early-Stage Precipitation in Al–Zn–Mg–Cu Alloy (7050), Acta Mater., 2004, 52, p 4503

    Article  CAS  Google Scholar 

  3. N.Q. Chinh, J. Lendvai, D.H. Ping, and K. Hono, The Effect of Cu on Mechanical and Precipitation Properties of Al–Zn–Mg Alloys, J. Alloys Compd., 2004, 378, p 52

    Article  CAS  Google Scholar 

  4. B.L. Ou, J.G. Yang, and M.Y. Wei, Effect of Homogenization and Aging Treatment on Mechanical Properties and Stress-Corrosion Cracking of 7050 Alloys, Metall. Mater. Trans., 2007, 38A, p 1760

    Article  CAS  Google Scholar 

  5. M. Puiggali, A. Zielinski, J.M. Olive, E. Renauld, D. Desjardins, and M. Cid, Effect of Microstructure on Stress Corrosion Cracking of an Al-Zn-Mg-Cu Alloy, Corros. Sci., 1998, 40, p 805

    Article  CAS  Google Scholar 

  6. J.C. Lin, H.L. Liao, W.D. Jehng, C.H. Chang, and S.L. Lee, Effect of Heat Treatments on the Tensile Strength and SCC-Resistance of AA7050 in an Alkaline Saline Solution, Corros. Sci., 2006, 48, p 3139

    Article  CAS  Google Scholar 

  7. K. Rajan, W. Wallace, and J.C. Beddoes, Microstructural Study of a High-Strength Stress-Corrosion Resistant 7075 Aluminium Alloy, J. Mater. Sci., 1982, 17, p 2817

    Article  CAS  ADS  Google Scholar 

  8. A.F. Oliveira, M.C. de Barros, K.R. Cardoso, and D.N. Travessa, The Effect of RRA on the Strength and SCC Resistance on AA7050 and AA7150 Aluminium Alloys, Mater. Sci. Eng. A, 2004, 379, p 321

    Article  Google Scholar 

  9. M. Dixit, R.S. Mishra, and K.K. Sankaran, Structure–Property Correlations in Al 7050 and Al 7055 High-Strength Aluminum Alloys, Mater. Sci. Eng. A, 2008, 478, p 163

    Article  Google Scholar 

  10. B.M. Cina, Reducing the Susceptibility of Alloys, Particularly Aluminum Alloys, to Stress Corrosion Cracking, U.S. Patent 3,856,584, 1974

  11. B.L. Ou, J.G. Yang, and C.K. Yang, Effects of Step-Quench and Aging on Mechanical Properties and Resistance to Stress Corrosion Cracking of 7050 Aluminum Alloy, Mater. Trans., 2000, 41, p 783

    CAS  Google Scholar 

  12. L.P. Huang, K.H. Chen, S. Li, and M. Song, Influence of High-Temperature Pre-Precipitation on Local Corrosion Behaviors of Al–Zn–Mg Alloy, Scr. Mater., 2007, 56, p 305

    Article  CAS  Google Scholar 

  13. M. Song and K. Chen, Effects of the Enhanced Heat Treatment on the Mechanical Properties and Stress Corrosion Behavior of an Al–Zn–Mg Alloy, J. Mater. Sci., 2008, 43, p 5265

    Article  CAS  ADS  Google Scholar 

  14. S. You, P. Jones, A. Padwal, P. Yu, M. O’Keefe, W. Fahrenholtz, and T. O’Keefe, Response of Nanocrystalline Cerium-Based Conversion Coatings on Al 2024–T3 to Chloride Environments, Mater. Lett, 2007, 61(17), p 3778

    Article  CAS  Google Scholar 

  15. H. Rahmatalla, M. Al-Rimawi, and T. Al-Hadid, Effect of Shot-Peening on Stress Corrosion Cracking (SCC) of 7075-T6 Aluminium Alloy, Proceedings of the ICSP-6 Conference, 1996, p 184

  16. J. Fader, C. Keeney, J. Hawkins, M. Clements, and S. Yollick, Anti-Corrosion Coating Applied During Shot-Peening Process, U.S. Patent 6,874,214, 2005

    Google Scholar 

  17. H.L. Liao, J.C. Lin, and S.L. Lee, Effect of Pre-Immersion on the SCC of Heat-Treated AA7050 in an Alkaline 3.5% NaCl, Corros. Sci., 2009, 51, p 209

    Article  CAS  Google Scholar 

  18. A. Deschamps, Y. Brechet, P. Guyot, and F. Livet, On the Influence of Dislocations on Precipitation in an Al-Zn-Mg Alloy, Z. Metallkd., 1997, 88, p 601

    CAS  Google Scholar 

  19. A. Deschamps, F. Livet, and Y. Brechet, Influence of Predeformation on Ageing in an Al–Zn–Mg Alloy—I. Microstructure Evolution and Mechanical Properties, Acta Mater., 1999, 47, p 281

    Article  CAS  Google Scholar 

  20. M. Talianker and B. Cina, Retrogression and Reaging and the Role of Dislocations in the Stress Corrosion of 7000-Type Aluminum Alloys, Metall. Trans., 1989, 20A, p 2087

    CAS  Google Scholar 

  21. L. Wagner and C. Mueller, Effect of Shot-Peening on Fatigue Behaviour in Al-Alloys, Mater. Manuf. Processes, 1992, 7, p 423

    Article  CAS  Google Scholar 

  22. M. Hilpert, “Dauerschwingverhalten von Magnesiumlegierungen: Einfluss von mechanischen Oberfl¨achenbehandlungen und Umgebungsmedien,” Dr.-Ing. Thesis, BTU Cottbus, 2001

  23. J.K. Gregory and L. Wagner, Shot-Peening, L. Wagner, Ed., Wiley–VCH, Weinheim, 2003

  24. Y.H. Zhao, X.Z. Liao, Z. Jin, R.Z. Valiev, and Y.T. Zhu, Microstructures and Mechanical Properties of Ultrafine Grained 7075 Al Alloy Processed by ECAP and Their Evolutions During Annealing, Acta Mater., 2004, 52, p 4589

    Article  CAS  Google Scholar 

  25. Y.H. Zhao, K. Zhang, and K. Lu, Structure Characteristics of Nanocrystalline Element Selenium with Different Grain Sizes, Phys. Rev. B, 1997, 56, p 14322

    Article  CAS  ADS  Google Scholar 

  26. T.C. Tsai, J.C. Chang, and T.H. Chuang, Stress Corrosion Cracking of Superplastically Formed 7475 Aluminum Alloy, Metall. Mater. Trans., 1997, 28A, p 2113

    Article  CAS  Google Scholar 

  27. G. Waterloo, V. Hansen, J. Gjonnes, and S.R. Skjervold, Effect of Predeformation and Preaging at Room Temperature in Al–Zn–Mg–(Cu, Zr) Alloys, Mater. Sci. Eng. A, 2001, 303, p 226

    Article  Google Scholar 

  28. D. Wang and Z.Y. Ma, Effect of Pre-strain on Microstructure and Stress Corrosion Cracking of Over-Aged 7050 Aluminum Alloy, J. Alloys Compd., 2009, 469, p 445

    Article  CAS  Google Scholar 

  29. D. Dumont, A. Deschamps, and Y. Brechet, On the Relationship Between Microstructure, Strength and Toughness in AA7050 Aluminum Alloy, Mater. Sci. Eng. A, 2003, 356, p 326

    Article  Google Scholar 

  30. D. Najjar, T. Magnin, and T.J. Warner, Influence of Critical Surface Defects and Localized Competition Between Anodic Dissolution and Hydrogen Effects During Stress Corrosion Cracking of a 7050 Aluminium Alloy, Mater Sci. Eng. A, 1997, 238, p 293

    Article  Google Scholar 

  31. Metals Handbook, Vol 1, American Society for Metals, Cleveland, OH, 1961

  32. J. Albrecht, I.M. Bernstein, and A.W. Thompson, Evidence for Dislocation Transport of Hydrogen in Aluminum, Metall. Trans., 1982, 13A, p 811

    Google Scholar 

  33. D. Nguyen, A.W. Thompson, and I.M. Bernstein, Microstructural Effects on Hydrogen Embrittlement in a High Purity 7075 Aluminum Alloy, Acta Metall., 1987, 35, p 2417

    Article  CAS  Google Scholar 

  34. R.G. Song, W. Dietzel, B.J. Zhang, W.J. Liu, M.K. Tseng, and A. Atrens, Stress Corrosion Cracking and Hydrogen Embrittlement of an Al–Zn–Mg–Cu Alloy, Acta Mater., 2004, 52, p 4727

    Article  CAS  Google Scholar 

  35. R.G. Song, M.K. Tseng, B.J. Zhang, J. Liu, Z.H. Jin, and K.S. Shin, Grain Boundary Segregation and Hydrogen-Induced Fracture in 7050 Aluminium Alloy, Acta Mater., 1996, 44, p 3241

    Article  CAS  Google Scholar 

  36. R. Deiasi and P.N. Adler, Calorimetric Studies of 7000 Series Aluminum Alloys: I. Matrix Precipitate Characterization of 7075, Metall Trans., 1977, 8A, p 1177

    CAS  Google Scholar 

  37. Y.H. Zhao, X.Z. Liao, S. Cheng, E. Ma, and Y.T. Zhu, Simultaneously Increasing the Ductility and Strength of Nanostructured Alloys, Adv. Mater., 2006, 18, p 2280

    Article  CAS  Google Scholar 

  38. R.E. Smallman and K.H. Westmacott, Stacking Faults in Face-Centred Cubic Metals and Alloys, Philos. Mag., 1957, 2, p 669

    Article  CAS  ADS  Google Scholar 

  39. S. Cheng, Y.H. Zhao, Y.T. Zhu, and E. Ma, Optimizing the Strength and Ductility of Fine Structured 2024 Al Alloy by Nano-Precipitation, Acta Mater., 2007, 55, p 5822

    Article  CAS  Google Scholar 

  40. I.J. Polmear, Light Alloys, 4th ed., Butterworth-Heinmann, Oxford, 2006

    Google Scholar 

Download references

Acknowledgments

The financial support for this research (grant number 86-GR-ENG-62) given to Dr. B. Hashemi by the Research Committee of Shiraz University is gratefully appreciated.

Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran

    Hamidreza Fooladfar, Babak Hashemi & Mousa Younesi

Authors
  1. Hamidreza Fooladfar
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Babak Hashemi
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Mousa Younesi
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Hamidreza Fooladfar.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Fooladfar, H., Hashemi, B. & Younesi, M. The Effect of the Surface Treating and High-Temperature Aging on the Strength and SCC Susceptibility of 7075 Aluminum Alloy. J. of Materi Eng and Perform 19, 852–859 (2010). https://doi.org/10.1007/s11665-009-9562-z

Download citation

  • Received:

  • Revised:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11665-009-9562-z

Keywords

Search

Navigation