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Study of the Effect of Laser Shock Peening on Corrosion Behavior of Aluminum Alloy 7075

Aravamudhan, Boopa Nandhini
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535374351540327

Abstract Details

2018, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
Stress Corrosion cracking of Aluminium 7075 has been an important concern in aerospace industry. AA7075 is one of the three alloys that contribute to 90 percent of the service failures in aluminium-based structures. Hence, there is a need to improve SCC resistance of this alloy. This can be done by introducing compressive residual stresses in the material to counteract the tensile stress arising from manufacturing processes and service conditions. Shot peening, water jet peening, low plasticity burnishing, Ultrasonic Nanocrystal Surface Modification (UNSM), Laser Shock Peening are examples of the surface treatments that induce compressive residual stresses in materials, together with changes in microstructure and properties. This study is an investigation for Laser Shock Peening (LSP) as a mitigation technique to improve corrosion and stress corrosion cracking resistance of Al 7075 - T6 alloy. Different experimental trials were conducted to determine the optimal parameters of LSP for the mitigation. The specimens peened using these optimal parameters were tested and compared with the unpeened (baseline) samples under similar conditions. Polarization tests show that there is 65.5% reduction in the corrosion rate of the laser peened material as compared to the baseline. Slow strain rate tests were conducted in sodium chloride environment to evaluate the stress corrosion cracking resistance of the baseline and laser peened specimens. LSP leads to a 14% increase in yield strength of the alloy which contributes to the improvement in stress corrosion cracking resistance of the material in sodium chloride environment. The increase in yield strength and corrosion resistance, along with microstructural changes induced by LSP could have a combined effect in improving the SCC resistance. Thus LSP is effective in improving the corrosion and stress corrosion cracking resistance of Al 7075 alloy.
Vijay Vasudevan, Ph.D. (Committee Chair)
Ashley Paz y Puente, Ph.D. (Committee Member)
Matthew Steiner, Ph.D. (Committee Member)
148 p.
Materials Science
Laser Shock Peening; Stress corrosion cracking; Al 7075; Aluminum; corrosion; surface treatment

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Citations

  • Aravamudhan, B. N. (2018). Study of the Effect of Laser Shock Peening on Corrosion Behavior of Aluminum Alloy 7075 [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535374351540327

    APA Style (7th edition)

  • Aravamudhan, Boopa Nandhini. Study of the Effect of Laser Shock Peening on Corrosion Behavior of Aluminum Alloy 7075. 2018. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535374351540327.

    MLA Style (8th edition)

  • Aravamudhan, Boopa Nandhini. "Study of the Effect of Laser Shock Peening on Corrosion Behavior of Aluminum Alloy 7075." Master's thesis, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535374351540327

    Chicago Manual of Style (17th edition)

ucin1535374351540327
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