Activation Energy of Pinning During the Recovery of Internal Friction in Pure and Doped Aluminum

The phenomenon of internal friction recovery of as-quenched and aged specimens of pure Al and Al--0.35 wt.% Fe alloy at different working temperatures was studied using the free decay method. The recovery in pure material was generally found to be less sensitive to temperature variation. The activat...

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Bibliographic Details
Published in:Solid state communications 1989-04 (70), p.375-379
Main Authors: Graiss, G, Saad, G, Makar, L N
Format: Article
Language:English
Online Access:Get full text
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Summary:The phenomenon of internal friction recovery of as-quenched and aged specimens of pure Al and Al--0.35 wt.% Fe alloy at different working temperatures was studied using the free decay method. The recovery in pure material was generally found to be less sensitive to temperature variation. The activation energy for the pinning process was found to have average values of 0.078 and 0.043 eV in the alloy and the pure material, respectively. Accordingly, a binding energy of 0.035 eV for Fe-vacancy pairs was estimated. The lower values of activation energy obtained confirm a point of view previously reported which considered the pinning process to be due to binding between pinners and dislocation segments. 9 ref.--AA(UK).
ISSN:0038-1098