| Title: |
Study of artificial aging in AlMgSi (6061) and AlMgSiCu (6013) alloys by Positron Annihilation |
| Author(s): |
T. Staab  , R. Krause-Rehberg, U. Hornauer and E. Zschech |
| Journal: |
Journal of Materials Science |
| Year: |
2006 |
| Volume: |
41 |
| Pages: |
1059-1066 |
| Publisher: |
Springer Netherlands |
| Affiliation: |
Martin-Luther Universität Halle-Wittenberg Department of Physics Friedemann-Bach-Platz 6 D-06108 Halle/Saale Germany Friedemann-Bach-Platz 6 D-06108 Halle/Saale Germany |
| DOI: |
10.1007/s10853-005-3640-x |
| ISSN: |
0022-2461 |
| File URL: |
http://www.springerlink.com/content/g227068l7m16v451 |
| Abstract: |
We investigate the artificial aging process of the weldable Al-alloys AA-6013 (AlMgSiCu) and AA-6061 (AlMgSi) by positron annihilation spectroscopy and Vickers micro-hardness measurements. We find a correlation between a minimum of the measured positron lifetime and the maximum hardness. To explain these findings AlZn will be discussed as a well known example of positron interaction with different types of precipitations in aluminum. Additionally, we calculate positron annihilation parameters for pure Al, Si, Mg, and \mboxMg_2\mboxSi finding support for our interpretation. For AA-6013 and AA-6061 the increase of the average positron lifetime after reaching the maximum hardness is attributed to the formation of semi-coherent precipitates. Hence, using positron annihilation it is possible to follow very sensitively the precipitation sequence even in technical aluminum alloys. Finally, we discuss which implications the aging may have on microstructural changes. |
