| Numéro |
J. Phys. IV France
Volume 06, Numéro C8, Décembre 1996
ICIFUAS 11Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C8-231 - C8-234 | |
| DOI | https://doi.org/10.1051/jp4:1996849 | |
ICIFUAS 11
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-231-C8-234
DOI: 10.1051/jp4:1996849
1 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestrasse 92, 701 74 Stuttgart, Germany
2 Institut für Physik, Heisenbergstrasse 1, 70569 Stuttgart, Germany
© EDP Sciences 1996
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-231-C8-234
DOI: 10.1051/jp4:1996849
High Temperature Internal Friction in NiAl Single Crystals
M. Weller1, M. Hirscher2, E. Schweizer2 and H. Kronmüller21 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaft, Seestrasse 92, 701 74 Stuttgart, Germany
2 Institut für Physik, Heisenbergstrasse 1, 70569 Stuttgart, Germany
Abstract
The internal friction of high-purity NiAl single crystals was investigated utilizing a low-frequency subresonance torsion apparatus. Above 1000K the damping increases strongly up to Q-1 = 0.3 at 1400K. The activation enthalpy of this viscoelastic relaxation depends on the composition and shows the highest value (2.8eV) for stoichiometric NiAl. The results are discussed in terms of diffusion-controlled climb of dislocations by vacancies.
© EDP Sciences 1996