LOW CYCLE FATIGUE OF BINARY Al-Li ALLOYS : III-COALESCENCE OF δ' PRECIPITATES IN FATIGUE : X-RAY LOW ANGLE SCATTERING INVESTIGATION

Y. Brechet , F. Livet

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.

Domaines: Articles anciens

Y. Brechet, F. Livet. LOW CYCLE FATIGUE OF BINARY Al-Li ALLOYS : III-COALESCENCE OF δ' PRECIPITATES IN FATIGUE : X-RAY LOW ANGLE SCATTERING INVESTIGATION. Journal de Physique Colloques, 1987, 48 (C3), pp.C3-717-C3-719. ⟨10.1051/jphyscol:1987383⟩. ⟨jpa-00226614⟩