Original scientific paper
Effect of loading on recovery of internal friction of Al-16 wt % Ag and Al-16 wt % Ag - 0.28 wt % Fe alloys
G. Graiss
; Physics Department, Faculty of Education, Ain-Shams University, Cairo, Egypt
M. A. Mahmoud
; Physics Department, Faculty of Education, Ain-Shams University, Cairo, Egypt
Abstract
The phenomenon of internal-friction recovery of Al-16 wt % Ag and Al-16 wt % Ag - 0.28 wt % Fe alloys is studied after cold-working the samples in uniaxial tension using the free decay method. The wire samples are investigated for internal friction recovery while they were loaded, within the elastic limit, by different loads at different testing temperatures. It is found that by increasing the temporary loading, the rate of recovery decreases. TEM investigations confirmed that the addition of Fe to Al-Ag alloy accelerates the formation and coarsening of Guinier-Preston zones. The results are explained on the basis of dislocation damping adopting the Granato-Lücke model for recovery of internal friction.
Keywords
internal friction recovery; Al–Ag and Al–Ag–Fe alloys; cold-working in uniaxial tension; free decay method; wire samples; different testing temperatures; Granato-Lucke model for recovery of internal friction
Hrčak ID:
300926
URI
Publication date:
2.5.1999.
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