| Issue |
J. Phys. Colloques
Volume 42, Number C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-899 - C5-904 | |
| DOI | https://doi.org/10.1051/jphyscol:19815138 | |
ICIFUAS-7
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-899-C5-904
DOI: 10.1051/jphyscol:19815138
Laboratoire de Matériaux Céramiques, ERA CNRS N°539, ENSCI Limoges, France
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-899-C5-904
DOI: 10.1051/jphyscol:19815138
ELASTIC AND ANELASTIC EFFECTS ASSOCIATED WITH PRECIPITATION PHENOMENA IN NON STOICHIOMETRIC SPINELS
D. Fargeot, C. Gault, F. Platon et P. BochLaboratoire de Matériaux Céramiques, ERA CNRS N°539, ENSCI Limoges, France
Abstract
(Al2O3)nMgO compounds with n ~ 3 - 3.5 have two phases at equilibrium : α corundum precipitates in a γ spinel matrix. The splat cooling due to plasma spraying (polycrystals) and Verneuil's method (single crystals) lead to a metastable γ cubic state. Subsequent annealing gives the stable state. The evolutions are related to a strong increase of elastic moduli, and a decrease of the damping. This was obtained through three steps : the first two due to preprecipitation and precipitation, the third one to sintering.