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Proceedings Paper

Positron annihilation spectroscopy to study nanoprecipitations in aluminum alloys
Author(s): Norbert Meyendorf; Gunter Dlubek; Alexander Surkov
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Paper Abstract

Positron Annihilation Spectroscopy has been used to study the microstructure in aluminum alloy AA7075-T6 after RRA (retrogression and re-aging) heat treatment. Nano-precipitates act as traps for thermalised positrons. The measured positron lifetime is sensitive to the local electron density at the annihilation site while the Doppler broadening of the annihilation line is sensitive to the chemical environment of the annihilation site. The combination of both methods was used to study changes of nano-precipitates, during the Retrogression and Re-aging (RRA) process. Results are compared to previous published isochronal annealing experiments of an Al Cu model alloy.

Paper Details

Date Published: 21 July 2004
PDF: 9 pages
Proc. SPIE 5392, Testing, Reliability, and Application of Micro- and Nano-Material Systems II, (21 July 2004); doi: 10.1117/12.541360
Show Author Affiliations
Norbert Meyendorf, Univ. of Dayton Research Institute (United States)
Gunter Dlubek, Institute for Innovation Technologies GmbH (Germany)
Alexander Surkov, Fraunhofer-Institut fur Zerstuerungsfreie Pruefverfahren (Germany)


Published in SPIE Proceedings Vol. 5392:
Testing, Reliability, and Application of Micro- and Nano-Material Systems II
Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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