Nonmagnetic Elinvar-Type Alloys in Mn-Cu-Co System

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  • Masumoto Hakaru
    The Foundation; The Research Institute of Electric and Magnetic Alloys
  • Sawaya Shôhachi
    The Foundation; The Research Institute of Electric and Magnetic Alloys
  • Kikuchi Michio
    The Foundation; The Research Institute of Electric and Magnetic Alloys

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  • Mn-Cu-Co系新非磁性エリンバー型合金について
  • Mn-Cu-Coケイ シン ヒジセイ エリンバーカタ ゴウキン ニ ツイテ

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Measurements of Young’s modulus at −150°∼400°C and of rigidity modulus and hardness at room temperature have been carried out with Mn-Cu-Co alloys subjected to a variety of heat treatment and cold working. The Young’s modulus vs temperature curves of Mn-Cu-Co alloys containing about 10.15∼30.39%Cu and 4.62∼20.08%Co which were slow-cooled after heating for 1 hr at 900°C show distinct anomalous changes due to the antiferromagnetic\ ightleftarrowsparamagnetic transformation. The difference in the values of Young’s modulus at room temperature in the annealed, cold worked or water quenched state is hardly observable in the composition range of comparatively small manganese or cobalt content, but the difference becomes larger as the contents of these elements increase. The temperature coefficient of Young’s modulus is remarkably affected by annealing, water quenching, cold working, and reheating after water quenching or cold working, and also by alloy composition. And, the temperature coefficients of Young’s modulus as a function of composition exhibit large maximum and minimum values in positive or negative sign, thus showing the Elinvar-proporty. The variations in rigidity modulus and its temperature coefficient with temperature, reduction and composition show a close resemblance to those in Young’s modulus and its temperature coefficient. The values of hardness in the annealed, cold worked and water quenched states are generally lower than those in the reheating state after cold working or water quenching. And the oxidation and corrosion resistance of Mn-Cu-Co alloys are fairly satisfactory.

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