Abstract
Masumoto et al. discovered in the previous work high permeability alloy “Nimalloys” in the nickel and manganese system. Much subsequent works have been carried out on the effect of various element additions on the characteristic properties of nickel-manganese alloys and the highest initial permeability of 76000 and the highest maximum permeability of 441000 have been obtained. The results obtained by tin addition sto nickel-manganese alloys show that initial and maximum permeabilities are increased in general with increasing tin content: the alloy consisting of 77.07%Ni, 17.36%Mn and 5.57%Sn exhibits the highest initial permeability of 11200 when cooled at a rate of 240°C/hr from 900°C and by reheated at 440°C for 1 hr, while the alloy consisting of 75.19%Ni, 11.20%Mn and 13.61%Sn shows the highest maximum permeability of 73700 when cooled at a rate of 2800°C/hr from 900°C and reheated at 380°C for 15 hr. The latter alloy shows a magnetic hysteresis loss of 66.97 erg/cm3/cycle and a coercive force of 0.0182 Oe for the maximum magnetic induction of 5000 G, a magnetic induction of 5290 G at a field of 50 Oe and an electrical resistivity of 56.0 μΩ-cm at 20°C.
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