On the Relation between Damping Capacity and Magnetomechanical Properties of Ni-Co Alloys

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  • Ni-Co合金の減衰能と磁気機械的性質との関係
  • Ni Co ゴウキン ノ ゲンスイノウ ト ジキ キカイテキ セイシツ ト ノ

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The internal friction Q−1, magnetic hysteresis loop, magnetostriction λ, ΔG effect and mechanical properties have been measured in Ni-Co alloys containing 0–70%Co. The Q−1 and regidity modulus measurements were carried out by the inverted tortion pendulum method. The hysteresis loop and λ were measured using an automatic recording fluxmeter and the optical roller method. Tensile testing was performed using an Instron-type tensile machine.<BR>The Q−1 values of Ni-Co alloys increase with maximum shear strain-amplitude γm and attain their peaks Q−1max. For the alloys with Co less than 20%, the variation in Q−1max with composition is complex and Q−1max shows a maximum at 10%Co. For the alloys with Co more than 22%, Q−1max becomes higher by water-quenching than by furnace-cooling. In the range of 20–60%Co, the hysteresis loop after furnace-cooling is of the Perminvar-type, but the loop after water-quenching is normal. Furthermore, the variations in coercive force Hc with composition and heat-treatment are very similar to those in γc which is the γm value for Q−1max. The Hc value is proportional to the γc value. The strengths of magnetic field H for the maximum of Q−1max are almost consistent with those for the maximum values of ΔWh⁄ΔH and Δλ⁄ΔH which are gradients of the lines joining the origin to each point on the curves of hysteresis loss Wh or λ versus H.

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