Magnetic properties of Fe–xMo–5Ni–0.05C alloys (x=5, 8, 11 and 15 wt.%)

Abstract

The magnetic properties of Fe–xMo–5Ni–0.05C (x=5, 8, 11 and 15wt.%) were investigated. The alloys were solution treated at 1200°C and aged at 610°C for magnetic (and mechanical) hardening. The saturation induction (Bs) decreases and the coercive force (Hc) increases with the increase of the Mo concentration. The Bs values also decrease during the aging of the alloys when the Mo concentration is higher than 5%. The residual induction (Br) was maximum in the alloy with 11%Mo. Some increase in the Br values was obtained by a cold deformation step prior to aging. Thermomagnetic analysis (TMA) shows that, as expected, the Curie temperature (TC) decreases with the increase of the Mo concentration. A precipitation effect due to thermal annealing was observed in the alloys of higher Mo concentration tested with low heating rate.