Author： Kong Q. P. Lucke K.
Publisher： Taylor & Francis Ltd
ISSN： 0141-8610
Source： Philosophical Magazine. A. Physics of Condensed Matter. Defects and Mechanical Properties, Vol.79, Iss.9, 1999-09, pp. : 2185-2193
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Abstract
The present paper attempts to give a detailed theoretical analysis of the mechanism for a relaxation peak of internal friction which occurs around 210 K in concentrated Cu-Al and Cu-Zn alloys at about 1 Hz. It is shown that the observed peak is a superposition of two components, which are respectively induced by the overall motion of extended dislocations (acoustical mode) and the relative motion between two partials (optical mode). Assuming that the solute atom-vacancy pairs on dislocation lines act as mobile pinning agents damping the motion of dislocations, the evaluated peak temperature is close to the observed one.
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