| Numéro |
J. Phys. Colloques
Volume 48, Numéro C3, Septembre 1987
4th International Aluminium Lithium Conference
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|---|---|---|
| Page(s) | C3-717 - C3-719 | |
| DOI | https://doi.org/10.1051/jphyscol:1987383 | |
4th International Aluminium Lithium Conference
J. Phys. Colloques 48 (1987) C3-717-C3-719
DOI: 10.1051/jphyscol:1987383
Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques, ENSEEG, Domaine Universitaire, B.P. 75, F-38402 Saint-Martin-d'Hères Cedex, France
J. Phys. Colloques 48 (1987) C3-717-C3-719
DOI: 10.1051/jphyscol:1987383
LOW CYCLE FATIGUE OF BINARY Al-Li ALLOYS : III-COALESCENCE OF δ' PRECIPITATES IN FATIGUE : X-RAY LOW ANGLE SCATTERING INVESTIGATION
Y. BRECHET et F. LIVETLaboratoire de Thermodynamique et Physico-Chimie Métallurgiques, ENSEEG, Domaine Universitaire, B.P. 75, F-38402 Saint-Martin-d'Hères Cedex, France
Abstract
Al 2.5 wt% Li binary alloys with small δ' precipitates (R~10 Å) were cyclically deformed in torsion at constant applied strain amplitude Ɗε, with the same strain rate ε. The size of δ' precipitates was measured before and after fatigue by X ray low angle scattering . We have shown by this method that an enhanced coalescence takes place during fatigue. It is concluded that the behaviour of δ' precipitates during fatigue is governed by two competing phenomena : the dissolution induced by shearing, and the coalescence induced by sursaturation of point defects produced by fatigue.