| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-85 - C5-90 | |
| DOI | https://doi.org/10.1051/jphyscol:1981512 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-85-C5-90
DOI: 10.1051/jphyscol:1981512
1 Institut de Génie Atomique, Swiss Federal Institute of Technology, Ecublens CH - 1015 Lausanne, Switzerland
2 On leave from IPEN, Sao Paulo, Brazil
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-85-C5-90
DOI: 10.1051/jphyscol:1981512
INTERNAL FRICTION STUDY OF THE γ PEAK IN COLD-WORKED NIOBIUM
F. De Lima1, 2 et W. Benoit11 Institut de Génie Atomique, Swiss Federal Institute of Technology, Ecublens CH - 1015 Lausanne, Switzerland
2 On leave from IPEN, Sao Paulo, Brazil
Abstract
The γ peak due to the double kink generation (DKG) along screw dislocations has been observed in high purity niobium. This peak appears at 270K (1Hz) and is unstable. Some special thermomechanical treatments have been realized in order to develop and stabilize this peak. The evolution of the internal friction spectra has been studied as a function of these treatments. The screw dislocations network created by low temperature deformation is unstable and rearranges in two stages : a W stage (180K-240K) and a X stage (280K-350K). The transformation accomplished in the W stage and the effect of the γ peak stabilization treatment have been observed by transmission electron microscopy.