The relationship between, the microstructure and magnetic properties of hect treated Fe-23wt%Cr-15wt%Co-5wt%V has been studied by transmission electron microscopy and Lorentz microscopy. Three different heattreatments were adopted : for the present investigations viz., 1) isothermal aging, 2) TMT (thermorcsghctic treatment) + step-aging, 3) continuous cooling. It has been found that the magnetic properties of the alloy are very sensitive to the temperature of the thermoraagnetic treatment.Stepaging gave the best magnetic properties, producing an elongated ferromag netic phase, 300l in diameter and 1200A in length. Lorentz microscopy revealed domain walls and these lie within the Cr-rich phase and pinned by'the Fe-rich phase in the lsothermally aged alloy at 650 C. Magnetic domains of optimally step-aged alloy, 0. Sum, in width', are elongated along the direction of the applied magnetic field. The results suggest that the magnetic anisotropy is introduced parallel to the direction of the applied magnatic field during TMT and step-aging treatments.
The microstructure and magnetic properties of the Fe-Cr-15 (wt%) Co hard permanent magnetic alloys with and without V and V+Ti are studied using transmission electron microscopy and transmission Lorentz microscopy. (AIP)
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