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FIZIKA A 8 (1999) 2 , 65-74
 
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 and M. A. MAHMOUD
Physics Department, Faculty of Education, Ain-Shams University,
Cairo, Egypt
Received 24 June 1999; Accepted 13 September 1999
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.
PACS numbers: 61.72.Hh, 62.40.+i
UDC 531.785.5
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-Lücke model for recovery of internal friction
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