The longitudinal velocity Vl and shear velocity Vs of ultrasonic wave propagated along arbitrary three perpendicular directions of the Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) bulk metallic glass(Zr/Ti BMG)have b...The longitudinal velocity Vl and shear velocity Vs of ultrasonic wave propagated along arbitrary three perpendicular directions of the Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) bulk metallic glass(Zr/Ti BMG)have been measured at ambient pressure,under hydrostatic pressure(up to 0.5 GPa)and uniaxial compression(up to 70 MPa)using the pulse echo overlap method.The third order elastic constants and the Grüneisen parameter related to the anharmonic properties were derived and discussed.It was found that the BMG with marked different microstructural characteristics comparing with the amorphous carbon exhibited different behaviours related to shear vibratory under high pressure.展开更多
The acoustic velocity,attenuation,and their pressure dependence of a bulk metallic glass Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) have been measured under pressures up to 0.5 GPa at room temperature using the pul...The acoustic velocity,attenuation,and their pressure dependence of a bulk metallic glass Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) have been measured under pressures up to 0.5 GPa at room temperature using the pulse echo overlap method.The sample was prepared from melt by quenching into liquid nitrogen.Bulk modulus,Young’s modulus,shear modulus,and Poisson’s ratio were derived,other elastic properties and vibrational anharmonicity were also discussed.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.19874075 and 59871059.
文摘The longitudinal velocity Vl and shear velocity Vs of ultrasonic wave propagated along arbitrary three perpendicular directions of the Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) bulk metallic glass(Zr/Ti BMG)have been measured at ambient pressure,under hydrostatic pressure(up to 0.5 GPa)and uniaxial compression(up to 70 MPa)using the pulse echo overlap method.The third order elastic constants and the Grüneisen parameter related to the anharmonic properties were derived and discussed.It was found that the BMG with marked different microstructural characteristics comparing with the amorphous carbon exhibited different behaviours related to shear vibratory under high pressure.
基金Supported in part by the National Natural Science Foundation of China under Grant No.49374209.
文摘The acoustic velocity,attenuation,and their pressure dependence of a bulk metallic glass Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10.0)Be_(22.5) have been measured under pressures up to 0.5 GPa at room temperature using the pulse echo overlap method.The sample was prepared from melt by quenching into liquid nitrogen.Bulk modulus,Young’s modulus,shear modulus,and Poisson’s ratio were derived,other elastic properties and vibrational anharmonicity were also discussed.
