Compact A15 Frank-Kasper nano-phases at the origin of dislocation loops in face-centred cubic metals

Alexandra M. Goryaeva (), Christophe Domain, Alain Chartier, Alexandre Dézaphie, Thomas D. Swinburne, Kan Ma, Marie Loyer-Prost, Jérôme Creuze and Mihai-Cosmin Marinica ()
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Alexandra M. Goryaeva: Université Paris-Saclay, CEA, Service de recherche en Corrosion et Comportement des Matériaux, SRMP
Christophe Domain: EDF-R&D, Département Matériaux et Mécanique des Composants (MMC), Les Renardieres
Alain Chartier: Service de recherche en Corrosion et Comportement des Matériaux
Alexandre Dézaphie: Université Paris-Saclay, CEA, Service de recherche en Corrosion et Comportement des Matériaux, SRMP
Thomas D. Swinburne: Aix-Marseille Université, CNRS
Kan Ma: Université Paris-Saclay, CEA, Service de recherche en Corrosion et Comportement des Matériaux, SRMP
Marie Loyer-Prost: Université Paris-Saclay, CEA, Service de recherche en Corrosion et Comportement des Matériaux, SRMP
Jérôme Creuze: Université Paris-Saclay
Mihai-Cosmin Marinica: Université Paris-Saclay, CEA, Service de recherche en Corrosion et Comportement des Matériaux, SRMP

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract It is generally considered that the elementary building blocks of defects in face-centred cubic (fcc) metals, e.g., interstitial dumbbells, coalesce directly into ever larger 2D dislocation loops, implying a continuous coarsening process. Here, we reveal that, prior to the formation of dislocation loops, interstitial atoms in fcc metals cluster into compact 3D inclusions of A15 Frank-Kasper phase. After reaching the critical size, A15 nano-phase inclusions act as a source of prismatic or faulted dislocation loops, dependent on the energy landscape of the host material. Using cutting-edge atomistic simulations we demonstrate this scenario in Al, Cu, and Ni. Our results explain the enigmatic 3D cluster structures observed in experiments combining diffuse X-ray scattering and resistivity recovery. Formation of compact nano-phase inclusions in fcc structure, along with previous observations in bcc structure, suggests that the fundamental mechanisms of interstitial defect formation are more complex than historically assumed and require a general revision. Interstitial-mediated formation of compact 3D precipitates can be a generic phenomenon, which should be further explored in systems with different crystallographic lattices.

Date: 2023
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DOI: 10.1038/s41467-023-38729-6

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