| Temperature dependence of the mechanical resonance frequency fm of ultrasonic wave in as-quenched and annealed Zr50Al10Cu40 metallic glasses was measured from room temperature to liquid nitrogen temperature. The mechanical resonance of longitudinal wave for the as-quenched sample disappeared in lower temperature below 200K. The resonance was restored at about 240K with increasing temperature. A hysteresis was observed in temperature dependence of fm. The qualitatively similar behaviors were observed also for transverse wave. The phenomena for the annealed samples are different from ones for the as-quenched one. The excess free volume may cause anomalous temperature dependence of fm. |
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