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Proceedings Paper

Microstructural study of nanoprecipitates in RRA treated Al-7075 T6 using AFM/UFM/STEM
Author(s): Samuel J. M. Kuhr; M. F. Pinnell; Daniel Eylon
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Paper Abstract

7075 T651 aluminum alloy is frequently used in aircraft applications for its high strength to weight ratio. However, aircraft parts made of this alloy have been plagued by stress corrosion cracking (SCC). Retrogression and re-aging (RRA) is a post T651 two-stage heat treatment that provides improved SCC resistance with minimal loss in tensile strength. In this study, various forms of microscopy and mechanical testing are used to investigate how the RRA process affects the microstructure. The microscopic observations in this paper show that the precipitates in the aluminum alloy coarsen and that the grain boundary regions are depleted of copper and magnesium. The mechanical testing performed shows that the aluminum alloy decreases in strength and increases in conductivity when exposed to longer retrogression times prior to re-aging.

Paper Details

Date Published: 22 July 2003
PDF: 12 pages
Proc. SPIE 5045, Testing, Reliability, and Application of Micro- and Nano-Material Systems, (22 July 2003); doi: 10.1117/12.484000
Show Author Affiliations
Samuel J. M. Kuhr, Univ. of Dayton Research Institute (United States)
M. F. Pinnell, Univ. of Dayton Research Institute (United States)
Univ. of Dayton (United States)
Daniel Eylon, Univ. of Dayton Research Institute (United States)
Univ. of Dayton (United States)


Published in SPIE Proceedings Vol. 5045:
Testing, Reliability, and Application of Micro- and Nano-Material Systems
Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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