Ni-Co-Nb-Cr系吸振合金の減衰能および磁気的機械的性質

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タイトル別名
  • Damping Capacity and Magnetic and Mechanical Properties of High Damping Ni-Co-Nb-Cr Alloys
  • Ni Co Nb Crケイ キュウシン ゴウキン ノ ゲンスイノウ オヨビ ジ

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The internal friction Q−1, and magnetic and mecanical properties were investigated as a function of Cr concentration in Ni-Co-Nb-Cr alloys containing 25, 45 or 65%Co and 3 or 5%Nb when furnace-cooled or water-quenched after heating at 1273 K for 7.2 ks. Measurements of the Q−1 and magnetic properties were carried out by an inverted torsion pendulum method and an automatic recording fluxmeter, and the mechanical properties were studied by using an Instron-type tensile testing machine.<BR>The maximum internal friction against the maximum shear strain-amplitude, Qmax−1, increased with Cr concentration, and the highest values of 59-91×10−3 were obtained for the alloys investigated. In the case of Ni-Co-Nb-Cr alloys with constant 3%Nb and 25, 45 and 65%Co, the Qmax−1 were highest at 3%Cr upon furnace cooling and 1%Cr upon water quenching, respectively. In the case of Ni-Co-Nb-Cr alloys with constant 5%Nb and 25, 45 and 65%Co, the highest values of Qmax−1 were obtained at 1%, 3% and 2%Cr upon furnace cooling and at 1%Cr upon water quenching, respectively.<BR>The coercive force Hc of the alloys decreased with the the increase in Cr concentration. The Hc of the alloys with high values of Qmax−1 increased with the increase in Co concentration; 0.051∼0.053 kA/m at 25%Co, 0.075∼0.11 kA/m at 45%Co and 0.10∼0.13 kA/m at 65%Co.<BR>Both the tensile strength and the yield strength of the alloys increased with increasing Cr concentration, while the elongation remained almost unchanged and showed fairly large values of 40∼60%.

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  • 日本金属学会誌

    日本金属学会誌 51 (11), 1093-1099, 1987

    公益社団法人 日本金属学会

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