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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
Author(s) -
Mahmoud M. A.,
Abd ElRehim A. F.,
Abd ElKhalek A. M.,
Ashry A. H.,
Graiss G.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410405
Subject(s) - creep , materials science , positron annihilation , doppler broadening , annihilation , atmospheric temperature range , positron , deformation (meteorology) , stress (linguistics) , metallurgy , thermodynamics , composite material , nuclear physics , spectral line , physics , linguistics , philosophy , astronomy , electron
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. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)