Ring-shaped platelets prepared by vacuum melting Ni-Fe-Ta alloys of 65.00∼83.65 % Ni, 8.00∼24.70 % Fe and 3.20∼23.90 % Ta were heated in pure hydrogen atmosphere at 1150°C for 3 hr and then cooled at various rates. Measurements of magnetic properties, specific electrical resistivity and hardness of the specimens have revealed that the addition of Ta to Ni-Fe alloys greatly improves these characteristics. The highest values of initial permeability and maximum permeability obtained are 57300 and 428000, respectively, for the composition of 73.00 % Ni, 12.05 % Fe and 14.95 % Ta when cooled at a rate of 800°C/hr from a temperature above the order-disorder transformation point. The coercive force and the intrinsic magnetic induction of the alloy are 0.0052 Oe (Bm = 5000 G) and 7420 G (H = 1000 Oe), respectively; its electrical resistivity and Vickers hardness are 64.3 µΩ-cm and 197, respectively.
(Received May 23, 1972)
* This paper was presented at the 1970 Autumn Meeting of the Japan Institute of Metals. Reported originally in Japanese in J. Japan Inst. Metals, 36 (1972), 63: The 60th Report from the Foundation: The Research Institute of Electric and Magnetic Alloys, Sendai, Japan.
** The Foundation: The Research Institute of Electric and Magnetic Alloys, 107, Higashi 8-bancho, Sendai, Japan.
© 2002 The Japan Institute of Metals
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