The Thermal Expansion and the Temperature Change of Young’s Modulus of Single Crystals of Hexagonal Cobalt

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  • Masumoto Hakaru
    The Foundation: The Research Institute of Electric and Magnetic Alloys
  • Saitô Hideo
    The Research Institute for Iron, Steel and Other Metals, Tôhoku University
  • Kikuchi Michio
    The Foundation: The Research Institute of Electric and Magnetic Alloys

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  • 六方晶コバルト単結晶の熱膨張および弾性率の温度変化
  • 6ポウショウ コバルトタンケッショウ ノ ネツ ボウチョウ オヨビ ダンセイリツ ノ オンド ヘンカ
  • The Thermal Expansion and the Temperature Change of Young’s Modulus of Single Crystals of Hexagonal Cobalt

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Abstract

Single crystals of cobalt having long length were prepared and their thermal expansion and Young’s modulus were measured over the temperature range from −100° to 350°C by a dilatometer and by means of a vibrator-controlled oscillator, respectively. From the measured values and the known values of volume compressibility, the elastic parameters, the elastic constants and the rigidity modulus were calculated. The thermal expansion coefficient, Young’s modulus and rigidity modulus for a poly-crystal were calculated and the calculated values agreed well with the measured values in melted poly-crystal specimens.

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