Abstract
Cobalt-free, semihard magnet alloys based on the Fe-Ni-Mo system have been developed for potential substitution of Co-Fe base alloys such as Vicalloy I (52Co-38Fe-10V) for use in magnetic devices where ductility is required for processing into thin strips. Desirable magnetic properties for Fe-20Ni-4∼6 Mo alloys of Br∼4000–16 000 G, Hc∼20–220 Oe, Br/Bs∼0.8–0.99 can be achieved through processing which produces a microduplex, aligned and elongated multiphase structure. This structure is obtained by a combination of initial plastic deformation, two-phase decomposition in the (α+γ) region, final deformation, and final low temperature precipitation aging. The alloys are ductile and easy to process, and in the final aged condition have high strengths (0.2% yield strength=100∼200 ksi), which could be useful in applications where both magnetic and mechanical strength as well as ductility are required.
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