Abstract
Sheet magnets of Fe-Cr-Co-base alloys can be inexpensively produced through a process consisting of spinodal-decomposition aging, intermediate cold rolling, and final aging. In the present study magnetic properties have been greatly improved by adding Si, Ti, and Cu to the base alloys. The addition of Si raises the coercive force by increasing the amount of paramagnetic (or weak ferromagnetic) Cr-rich matrix phase. The addition of Ti increases remanence and maximum energy product by suppressing the precipitation of nonmagnetic σ phase during the final aging. The addition of Cu leads to a slight increase in coercive force. The best magnetic properties obtained in this study are iHc=790 Oe, Br=10.6 kG, and (BH)max=4.5 MGOe with a Fe-33.3 wt. % Cr-11.9 wt. % Co-1.05 wt. % Si-0.22 wt. % Ti-2.07 wt. % Cu alloy.
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