Experimental (TEM and STEM) investigation and theoretical approach to the fatigue-induced dissolution of δ′ precipitates in a 2.5 wt% Al-Li alloy

Y. Brechet, F. Louchet, C. Marchionni, J. L. Verger-Gaugry

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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.

Original languageEnglish
Pages (from-to)353-366
Number of pages14
JournalPhilosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Issue number3
Publication statusPublished - Sept 1987
Externally publishedYes

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