Journal: Materials Research Letters

Abbreviation

Mater. Res. Lett.

Publisher

Taylor & Francis

Journal Volumes

ISSN

2166-3831

Description

Filters

2023 - 20252
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Publications 1 - 2 of 2
  • Unconventional {101¯2} twinning assisted by pyramidal II stacking faults
    Item type: Journal Article
    Hu, Yang; Kochmann, Dennis M. (2025)
    Materials Research Letters
    Twinning significantly affects the deformation behavior of hexagonal close-packed Mg, so a thor-ough understanding of twin nucleation and growth mechanisms is required for enhancing theproperties of Mg-based materials. The commonly observed {10¯12} tension twins have been tra-ditionally linked to 〈c + a〉 dislocation dissociation, which results in zonal dislocations with largeBurgers vectors several times that of a single twinning dislocation and some residual dislocations.Contrarily, our molecular dynamics simulations reveal {10¯12} twin nucleation from pyramidal IIstacking faults through atomic shuffling without shear displacements. This introduces an alterna-tive twin nucleation mechanism, different from the classically accepted mechanism of dislocation dissociation.
  • The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni
    Item type: Journal Article
    Lojewski, Tobias; Elhanoty, Mohamed F.; Le Guyader, Loïc; et al. (2023)
    Materials Research Letters
    The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be captured by electron repopulation respectively correlation-induced modifications of the electronic structure, requiring to take the local Coulomb interaction into account.
Publications 1 - 2 of 2