Influence of Severe Plastic Deformation on Magnetic Properties of Fe48Ni48Zr4, Fe49.5Co16.5B33Ta and Co80Zr16B4 Alloys☆

Abstract This work reports the influence of high pressure torsion (HPT) on magnetic properties of Fe 48 Ni 48 Zr 4 , Fe 49.5 Co 16.5 B 33 Ta and Co 80 Zr 16 B 4 alloys. High degree of the plastic deformation dramatically affects microstructure of the samples by reducing the grain size down to the nanometer scale. No significant change in magnetic properties was observed for of Fe 48 Ni 48 Zr 4 and Fe 49.5 Co 16.5 B 33 Ta alloys before and after heat treatment while an increase of the coercivity up to 2.25 kOe was found in the Co 80 Zr 16 B 4 sample after the heat treatment procedure. The origin of the coercivity increase lies in refined grain structure which was developed during HPT.