The fatigue microstructure of an Al-2.5 wt%Li alloy with small δ' 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 lithium-depleted 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.
|Number of pages||14|
|Journal||Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties|
|Publication status||Published - Sep 1987|