Experimental (TEM and STEM) investigation and theoretical approach to the fatigue-induced dissolution of δ′ precipitates in a 2.5 wt% Al-Li alloy
- 1 September 1987
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 56 (3) , 353-366
- https://doi.org/10.1080/01418618708214391
Abstract
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.Keywords
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