Structure Instability of Metallic Glass Zr50Cu40Al10 in Low Temperature
In order to examine mechanical properties of a metallic glass Zr50Cu40Al10 in low temperature below room temperature, the temperature T dependence of mechanical resonance of ultrasonic wave are measured. The mechanical resonance frequency in an as-quenched sample shows an abrupt increase at 200K for longitudinal wave and 160 K for transverse wave with decreasing T. After this abrupt increase, the sound propagation cannot be detected below these temperatures but the wave propagation is restored with increasing T and there is an abrupt decrease at 260K for the both wave modes. The similar hysteresis is observed in temperature dependence of the electrical resistivity. These suggest a kind of structure instability of Zr50Cu40Al10 in low temperature region.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
T. Fukami et al., "Structure Instability of Metallic Glass Zr50Cu40Al10 in Low Temperature", Materials Science Forum, Vols. 539-543, pp. 2100-2105, 2007