Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC-and AC-SQUID susceptometry and atom probe tomography

Martin Stückler , Heinz Krenn , Philipp Kürnsteiner (1) , Baptiste Gault (1) , Frédéric de Geuser (2) , Lukas Weissitsch , Stefan Wurster (3) , Reinhard Pippan (3) , Andrea Bachmaier (3)

1 Max-Planck-Institut für Eisenforschung GmbH
2 SIMaP - Science et Ingénierie des Matériaux et Procédés
3 ESI - Erich Schmid Institute of Materials Science

High-pressure torsion Spin glass Three dimensional atom probe (3DAP) Nanocrystalline materials a b s t r a c t The capability of high-pressure torsion on the preparation of supersaturated solid solutions, consisting of Cu-14Fe (wt.%), is studied. From microstructural investigations a steady state is obtained with nanocrys-talline grains. The as-deformed state is analyzed with atom probe tomography, revealing an enhanced solubility and the presence of Fe-rich particles. The DC-hysteresis loop shows suppressed long range interactions in the as-deformed state and evolves towards a typical bulk hysteresis loop when annealed at 500 • C. AC-susceptometry measurements of the as-deformed state reveal the presence of a superparam-agnetic blocking peak, as well as a magnetic frustrated phase, whereas the transition of the latter follows the Almeida-Thouless line, coinciding with the microstructural investigations by atom probe tomography. AC-susceptometry shows that the frustrated state vanishes for annealing at 250 • C.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Martin Stückler, Heinz Krenn, Philipp Kürnsteiner, Baptiste Gault, Frédéric de Geuser, et al.. Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC-and AC-SQUID susceptometry and atom probe tomography. Acta Materialia, 2020, 196, pp.210 - 219. ⟨10.1016/j.actamat.2020.06.035⟩. ⟨hal-02941083⟩