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

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  • Ni-Co-Nb系合金の減衰能ならびに磁気的および機械的性質
  • Ni Co Nbケイ ゴウキン ノ ゲンスイノウ ナラビニ ジキテキ オヨビ

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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.<BR>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.<BR>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 ΔG effect, the higher the Q−1 became.<BR>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.

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