Hakaru Masumoto1, Hideo Sait2 and Shizuo Kadowaki1
1The Foundation; The Research Institute of Electric and Magnetic Alloys, Sendai
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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