大块非晶合金[Ni3Zr8]Alx (x = 1,1.5, 2, 3)超声弹性性能与玻璃热稳定性的关系

he compositional dependence of ultrasonic properties of the [Ni3Zr8]Alx (x = 1,1.5, 2, 3) bulk metallic glass forming alloys has investigated by the ultrosonic immerse-water technique wich is based on the longitudinal wave grazing incidence. The samples with diameter of 4mm for the ultrasonic measurement are prepared by the copper mold casting and cut the rods with length of 9mm. Combined with the results of the thermal analysis, the ultrasonic velocity of longitudinal velocity Vl and transversal velocity Vt show the same trend as the glass transition temperature Tg and the onset crystallization temperature Tx with the increasing Al concentration. Elastic modulus of Shear modulus G and Young's modulus E, which are very sensitive to the change of the content of Al, increase with increasing Al concentration but the Poisson's ratio σ decreases. The linear correlation between the Tg and the elastic constants implies that non-Coulomb part of the interatomic potentials plays a significant role in both the thermal and elastic deformation behaviors in these bulk metallic glasses.