Al3(Sc,Zr)-based precipitates in Al-Mg alloy: Effect of severe deformation
Y. Buranova, V. Kulitskiy, M. Peterlechner, A. Mogucheva, R. Kaibyshev, S.V. Divinski, G. Wilde,
Volume: 124. Pages: 210--224
DOI: 10.1016/j.actamat.2016.10.064
Published: 2017
Abstract
Abstract Precipitate evolution in an \{AA5024\} Al-based alloy containing
Sc and Zr is investigated in different states: as-cast, extruded
and severely deformed. An overview of the microstructure is given
and the evolution of particle size and morphology as a function of
mechano-thermal processing is investigated, with an emphasis on the
Al3(Sc,Zr)-based precipitates. The precipitates are found to maintain
their coherence with the matrix after the interaction with dislocations
and low-angle grain boundaries as it is revealed by atomistic simulations
and by the so-called Geometric Phase Analysis of the local strain
fields. It is established that the precipitates can loose their coherency
with the matrix during the severe plastic deformation, that decreases
generally grain boundary pinning effect and promotes recrystallization.