日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 3 (1984),
pp. 314-319

Damping Capacity and Magnetic and Mechanical Properties of Ni-Co-Nb Alloys

Masakatsu Hinai1, Hakaru Masumoto1 and Showhachi Sawaya1

1The Research Institute of Electric and Magnetic Alloys, Yagiyama-Minami 2, Sendai 982

Abstract:

The internal friction Q-1, the magnetic hysteresis loop and the mechanical properties were investigated for three Ni-Co-Nb alloy series containing 25, 45 and 65%Co, respectively. Measurements of the Q-1 and the rigidity modulus G were carried out by the inverted torsion pendulum method. The coercive force Hc was measured using an automatic recording fluxmeter, and the tensile test was performed using an Instron-type machine.
In both states of furnace-cooling and water-quenching, the maximum internal friction, Qmax-1, for the maximum shear strain-amplitude became the highest at 3%Nb for the Ni-25%Co-Nb alloy series and at 5%Nb for the Ni-45%Co-Nb alloy series. For the Ni-65%Co-Nb alloy series, the Qmax-1 became the highest at 1%Nb upon furnace-cooling or at 5%Nb upon water-quenching.
The Qmax-1 value of the alloys having the reasonably small Hc was fairly high, while the Qmax-1 of the alloys having the large Hc was very low, because the compound Co2Nb or Co3Nb precipitated in the α phase matrix. Furthermore, the larger the Δ G effect, the higher the Q-1 became.
The tensile strength and the yield strength of the present three alloy series increased with increase in Nb content, and the elongation of these alloys was generally large.


(Received 1983/09/30)

Keywords:

damping capacity, internai friction, high damping material, nickel-cobalt-niobium alloy, coercive force, rigidity modulus, tensile strength, Co2Nb compound, Co3Nb compound


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