Evolution of phase, texture, microstructure and magnetic properties of Fe-Cr-Co-Mo-Ti permanent magnets

Magnetic phase evolution, crystallographic texture, microstructure and magnetic properties of Fe-28Cr-15Co-3.5Mo-1.8Ti alloy have been investigated by X-ray diffractometry, scanning transmission electron microscopy and magnetometry techniques as a function of processing conditions. Heat treatment conditions for obtaining optimum textural, microstructural and magnetic properties have been established by the experimentations. The Goss {110} < 001 > and cube type {001} < 010 > textures have been developed in an optimal treated Fe-28Cr-15Co-3.5Mo-1.8Ti magnets. The coercive force in Fe-28Cr-15Co-3.5Mo-1.8Ti magnets depends critically on the shape anisotropy of rod-like Fe Co Ti-rich alpha(1) particles and remanence on the alignment and elongation of alpha(1) particles parallel to applied magnetic field < 100 > directions. The optimum magnetic properties obtained in Fe-28Cr-15Co-3.5Mo-1.8Ti alloy are intrinsic coercive force, H-i(c), of 78.8 kA/m (990 Oe), remanence, B-r of 1.12T (11.2 kG) and energy product, (BH)(max) of 52.5 kJ/m(3) (6.5 MG Oe). The development of Fe-28Cr-15Co-3.5Mo-1.8Ti magnets as well as characterization of texture, microstructural and magnetic properties in the current study would be helpful in designing the new Fe-Cr-Co-Mo based magnets suitable for scientific and technological applications. Published by Elsevier B.V.