Young’s Modulus of Single Crystals of Palladium at High Temperatures

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  • Masumoto Hakaru
    The Foundation; The Research Institute of Electric and Magnetic Alloys
  • Sait\={o} Hideo
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Kadowaki Shizuo
    The Foundation; The Research Institute of Electric and Magnetic Alloys

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Other Title
  • パラジウム単結晶の高温におけるヤング率
  • パラジウムタンケッショウ ノ コウオン ニ オケル ヤングリツ
  • Young’s Modulus of Single Crystals of Palladium at High Temperatures

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Description

Single crystals of palladium having a long length were prepared and their thermal expansions and Young’s moduli were measured over the temperature range 0° to 600°C by a dilatometer and by means of a vibrator-controlled oscillator system. From the measured values, the Young’s moduli in three principal orientations of the single crystals were calculated. The results show that the Young’s moduli at 20°C are 7.35, 13.77 and 19.44×105 kg/cm2 in the orientations of ⟨100⟩, ⟨110⟩ and ⟨111⟩ of the single crystal, respectively. The Young’s moduli in the ⟨100⟩ and ⟨110⟩ orientations of the single crystals decrease with increasing temperature, while the modulus in the ⟨111⟩ orientation increases to a maximum at about 250°C and then gradually decreases. The calculated value of the Young’s modulus for a polycrystal agrees fairly well with the measured value in the polycrystal specimen prepared by melting.

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