Experimental (TEM and STEM) investigation and theoretical approach to the fatigue-induced dissolution of delta'-precipitates in a 2.5 wt % Al-Li alloy
Résumé
The fatigue microstructure of an Al-2.5 wt %Li alloy with small precipitates has been investigated both by TEM and STEM (nanodiffraction and electron energy loss spectroscopy). Specific features of strain localization have been evidenced which are made of lithiumdepleted precipitate-free bands. A model is proposed to explain the redissolution of δ precipitates inside the bands, based on an increase of their free energy due to shear-induced antiphase boundaries.
Domaines
Matière Condensée [cond-mat]
Origine : Fichiers produits par l'(les) auteur(s)