Study of precipitates formation in Al-4.5Wt%Cu and Al-4.5Wt%Cu-0.1Wt%In alloys using creep measurements and positron annihilation technique by M. A. Mahmoud, A. F. Abd El-Rehim, A. M. Abd El-Khalek, A. H. Ashry, and G. Graiss

Crystal Research and Technology

Cryst. Res. Technol. 40, 665 (2005) - Abstract -

Study of precipitates formation in Al-4.5Wt%Cu and Al-4.5Wt%Cu-0.1Wt%In alloys using creep measurements and positron annihilation technique

M. A. Mahmoud, A. F. Abd El-Rehim, A. M. Abd El-Khalek, A. H. Ashry, and G. Graiss

Physics Department, Faculty of Education, Ain-Shams University, Cairo, Egypt

Keywords	alloys, creep, positron annihilation
PACS	81.40.-Z
DOI	10.1002/crat.200410405

The transient and steady state creep deformation of Al-4.5 wt%Cu and Al-4.5 wt%Cu-0.1 wt%In alloys were studied using a constant stress in the aging temperatures range 403 to 703 K for various aging times under different working temperatures. Positron annihilation studies using Doppler-broadening measurements were carried out on the specimens used in creep measurements. The subsequent decrease and increase in the creep parameters n, β and ε_st as well as in Doppler lineshape parameter with increasing aging temperatures and aging times were explained on the basis of structure transformations occuring in Al-Cu alloys. The mechanical creep measurements are very well correlated with positron annihilation characteristics.

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