1The Research Institute of Electric and Magnetic Alloys, 2, Yagiyama Minami, Sendai
The magnetic and electric properties of Ni-Mn base polynary alloys have been measured. The specimens investigated are Ni-Mn-Me-alloys with less than about 24% Mn, where Me represents V, Nb, Ta, Cr, Mo, W and/or Fe. The permeabilities depend remarkably on chemical composition and heat treatment. The alloy of 79.38% Ni, 8.51% Mn, 5.06% Fe, 3.02% Cr and 4.03% Mo, heated at 1150°C for 3 h and cooled from 650°C to room temperature, exhibits the maximum performance. The highest value of initial permeability is 121000, obtained by the cooling rate of 240°C/h, while the cooling rate of 100°C/h yields the highest value of maximum permeability 643000. In the latter case the coercive force is 1.3 mOe, the magnetic hysteresis loss 0.92 erg/cm3/cycle (for a maximum induction of 2000 G), the saturation induction 2510G and the electric resistivity 84.7 μ \varOmega -cm at 20°C.
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