The Effect of Superplastic Deformation on Subsequent Service Properties of Fine Grained 7475 Al

[+] Author and Article Information
C. C. Bampton

Rockwell International Science Center, Thousand Oaks, Calif. 91360

J. W. Edington

University of Delaware, Newark, Del. 91711

J. Eng. Mater. Technol 105(1), 55-60 (Jan 01, 1983) (6 pages) doi:10.1115/1.3225619 History: Received January 27, 1982; Online September 15, 2009


Intergranular cavitation may be a limiting factor in the otherwise highly promising commercial exploitation of the recently developed superplastic forming process for the high strength aluminum alloy, 7475. A preliminary investigation has been carried out to quantify the effects of superplastic deformation on the major ambient temperature service properties. It is shown that the properties most degraded by the development of cavitation after large superplastic strains are those that depend on the local strain at tensile fracture. This affects, mainly, ductility and fatigue life. However, the effects are not generally significant below effective superplastic strains of about 0.8 to 0.9 (120–150 percent elongation) with the optimum forming conditions (T=516°C, ε̇=2×10−4 s−1 ). Furthermore, since the fine grain processing has an initial beneficial effect on the ductility-related properties, compared to conventionally processed sheet, most superplastically formed components would suffer very litle, if any, design penalties.

Copyright © 1983 by ASME
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In