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The Effect of Surface Over-Aging on the Strength and SCC Susceptibility of 7075 Aluminum Alloy

[+] Author Affiliations
Hamidreza Fooladfar, Babak Hashemi, Mousa Younesi

Shiraz University, Shiraz, Fars, Iran

Paper No. IMECE2009-13147, pp. 67-74; 8 pages
doi:10.1115/IMECE2009-13147
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 1: Advances in Aerospace Technology
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4374-1 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

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.

Copyright © 2009 by ASME
Topics: Aluminum alloys

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