Abstract
The present authors previously made a study on the relation between magnetic permeability and order-disorder transformation (Ni3Mn) in ferromagnetic nickel-manganese alloys and found a new high-magnetic permeability alloy “Nimalloy”.
Further experiments on the effect of addition of iron on Nimalloy have revealed that the alloys containing 19.37% manganese and 4.36% iron, and 19.33% manganese and 4.55% iron have an initial permeability of 39,200 and a maximum permeability of 213,000, when cooled at a rate of 26°C/sec from 600°C: The former shows a magnetic hysteresis loss of 5.40 erg/cm3/cycle, a coercive force of 0.0042 Oe for the maximum induction of 2,000 G, and a specific electrical resistivity of 68.5 μ Ω-cm at 20°C.
