| Issue |
J. Phys. Colloques
Volume 44, Number C9, Décembre 1983
ECIFUAS-4Fourth European Conference on Internal Friction and Ultrasonic Attenuation in Solids / Quatrième Conférence Européenne sur le Frottement Intérieur et l'Atténuation Ultrasonore dans les Solides |
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|---|---|---|
| Page(s) | C9-601 - C9-606 | |
| DOI | https://doi.org/10.1051/jphyscol:1983990 | |
Fourth European Conference on Internal Friction and Ultrasonic Attenuation in Solids / Quatrième Conférence Européenne sur le Frottement Intérieur et l'Atténuation Ultrasonore dans les Solides
J. Phys. Colloques 44 (1983) C9-601-C9-606
DOI: 10.1051/jphyscol:1983990
ON THE MECHANISM OF THE LOW TEMPERATURE INTERNAL FRICTION PEAKS IN COLD-WORKED Al - 0,5 wt% Cu AND Al - 4 wt% Cu ALLOYS
T.S. Kê (Ge Tingsui)1, J.X. Zhang2, P.F. Gobin3 et G. Fantozzi31 Institute of Solid State Physics, Academia Sinica, Hefei, China
2 Department of Physics, Zhongshan University, Guangzhou, China
3 Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, INSA de Lyon, 69621 Villeurbanne, France
Abstract
A detailed analysis of the low-frequency internal-friction peak observed in cold-worked Al-0.5 wt% (0.21 at%) Cu around 214 K (f= 2Hz) showed that it consists of two closely-situated internal-friction peaks : a relaxation peak (R-peak) and a "phase transformation peak" (P-peak). A.model of dragging by dislocations is suggested for the R-peak in which the copper atom-vacancy pairs are the mobile pinning agents. Experiments on Al-4 wt% (1.6 at%) Cu showed that the frequency-independent P-peak observed around 224 K cannot be attributed to the presence of G.P. [1] zone. This peak may be associated with some clustering stage of the Cu atoms in aluminum just before the formation of the G.P.[1] zone and may be correlated to an ordering phenomenon.