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

Abstract

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 nanocrystalline 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 superparamagnetic 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.

References in corpus (5)

• Metrology of small particles and solute clusters by atom probe tomography
• Homogeneous Cu-Fe super saturated solid solutions prepared by severe plastic deformation
• Magnetic Binary Supersaturated Solid Solutions Processed by Severe Plastic Deformation
• Magnetic dilution by severe plastic deformation
• Tuneable Magneto-Resistance by Severe Plastic Deformation

Cited by in corpus (6)

• Magnetic Materials via High-Pressure Torsion of Powders
• Sampling the Cu-Fe-Co phase diagram by severe plastic deformation for enhanced soft magnetic properties
• Microstructural Changes Influencing the Magnetoresistive Behavior of Bulk Nanocrystalline Materials
• Oxide-stabilized microstructure of severe plastically deformed CuCo alloys
• Magnetoresistive behaviour of ternary Cu-based materials processed by high-pressure torsion
• Evidence for suppression of collective magnetism in Fe-Ag granular multilayers