AC magnetic properties of the bulk Fe–Ni and Fe–Ni–Mo soft magnetic alloys prepared by warm compaction

Abstract

Soft magnetic properties of bulk crystalline samples were investigated. Rapidly quenched ribbons of Ni 81Fe 19 alloy and ball milled swarfs of ingot of Ni 79Fe 16Mo 5 alloy were warm consolidated at a pressure of 800 MPa to get bulk compacts. The frequency dependence of the peak permeability and total core losses in the range 0.2–1000 kHz and DC coercivity were studied. The core losses of the samples versus the maximum induction value B max at 20 kHz were investigated. The magnetic properties of the Ni–Fe and Ni–Fe–Mo alloys show dependence to its initial, master powder and annealing conditions. The results show that further annealing improves soft magnetic properties. The absolute values of losses and coercivity of Ni–Fe and Ni–Fe–Mo compacts are comparable to that of the material prepared by convention way in the form of thin sheet. Also, found that soft magnetic properties are better with Ni–Fe–Mo alloy as compared to Ni–Fe alloy.