Magnetic Binary Supersaturated Solid Solutions Processed by Severe Plastic Deformation

TL;DR

This study investigates the microstructure and magnetic properties of immiscible ferromagnetic and diamagnetic metal pairs processed by severe plastic deformation, revealing microstructural saturation and phase behaviors relevant to magnetic performance.

Contribution

It demonstrates how high-pressure torsion induces microstructural saturation and phase formation in immiscible metal systems, linking microstructure to magnetic properties.

Findings

Co-Cu samples show ferromagnetic behavior with decreasing coercivity as Co increases.

Fe-Cu samples exhibit dual-phase microstructure and magnetic phases.

Fe-Ag samples show no intermixing between elemental phases.

Abstract

Samples consisting of one ferromagnetic and one diamagnetic component which are immiscible at the thermodynamic equilibrium (Co-Cu, Fe-Cu, Fe-Ag) are processed by high-pressure torsion at various compositions. The received microstructures are investigated by electron microscopy and synchrotron X-ray diffraction, showing a microstructural saturation. Results gained from microstructural investigations are correlated to magnetometry data. The Co-Cu samples show mainly ferromagnetic behavior and a decrease in coercivity with increasing Co-content. The saturation microstructure of Fe-Cu samples is found to be dual phase. Results of magnetic measurements also revealed the occurrence of two different magnetic phases in this system. For Fe-Ag, the microstructural and magnetic results indicate that no intermixing between the elemental phases takes place.