Compact A15 Frank-Kasper nano-phases at the origin of dislocation loops in face-centred cubic metals - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2023

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

Alexandra Goryaeva
Christophe Domain
Alain Chartier
  • Function : Author
Alexandre Dézaphie
  • Function : Author
Kan Ma
  • Function : Author
Marie Loyer-Prost
  • Function : Author
Jérôme Creuze
  • Function : Author
Mihai-Cosmin Marinica

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.

Dates and versions

hal-04163000 , version 1 (17-07-2023)

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Cite

Alexandra Goryaeva, Christophe Domain, Alain Chartier, Alexandre Dézaphie, Thomas Swinburne, et al.. Compact A15 Frank-Kasper nano-phases at the origin of dislocation loops in face-centred cubic metals. Nature Communications, 2023, 14 (1), pp.3003. ⟨10.1038/s41467-023-38729-6⟩. ⟨hal-04163000⟩
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