The hard magnetic alloys of Fe-33Cr-11.5Co (wt.%) with and without less than one percent of Al, Si and Zr were investigated to understand effects of minor elements on microstructure and, magnetic and mechanical properties.
The alloys with minor additives showed (BH) max of ~5.2MGOe after about 75% reduction, which indicates the addition of minor elements in the small amount has no harmful effects on magnetic properties of this alloy. It was also found that the minor additives suppressed precipitation of harmful σ and γ phases significantly. The σ phase precipitated along grain boundary reduced the ductility of the material after some degree of spinodal decomposition although presence of the second phase seems decreasing the slip to twinning transition temperature. These results was interpreted in terms of role of second phases in breaking up of potential centers of stress concentration.
Also included are charge of yield strength, ductility, hardness, and deformation and fracture mode as the degree of Spinodal decomposition. These results were discussed in connection with second phases, dislocation substructure, and degree of phase separation.
