Observations on the influence of processing steps on the magnetic hysteresis parameters of a Co/Fe/Nb alloy

Data available on the magnetic hysteresis parameters of a Co/Fe/Nb alloy (Nibcolloy) reveal several discrepancies. To resolve these inconsistencies, an experimental program involving variations in annealing treatments and magnetic properties, mechanical properties, and microstructural characterization was carried out. Results indicate that the use of an anneal on hard drawn wire to mechanically soften it for possible forming operations prior to the final aging anneal can alter the final magnetic properties. The use or elimination of this anneal was a primary source of one of the discrepancies. Other results confirmed the reduced coercivity in additionally deformed (by cold rolling) and aged drawn wire as compared to the only as-drawn wire after aging. Contrary to the results of others, a nonstability of coercivity to subsequent brief elevated temperature exposures of around 1000°C was also observed. The source of this contradiction remains unresolved.