压力下Nd_(60)Al_(10)Fe_(20)Co_(10)块体金属玻璃的弹性行为

Elastic behaviour of Nd_(60)Al_(10)Fe_(20)Co_(10)bulk metallic glass under pressure

室温下在等静压最高达～0.5GPa的条件下,利用超声回波技术测量了超声波横波和纵波在Nd60Al10Fe20Co10块体金属玻璃中的传播时间来确定横波和纵波速度.测量时所采用的超声波频率为10MHz.利用所测量的数据,建立了超声波波速、样品的密度、弹性模量以及Debye温度等与所施加的压力之间的相互关系.并且推导出Murnaghan状态方程.另外,基于非晶态与晶态物理性能的相似性,对此块体非晶的压缩曲线、弹性常数和Debye温度等进行了理论计算,结果表明Nd60Al10Fe20Co10块体金属玻璃的弹性性能与其组成的元素有着密切的关系.

Measurements were carried out under hydrostatic pressure up to 0.5GPa at room temperature, by using an ultrasonic pulseecho method to measure the transit time of longitudinal and transverse elastic waves （10MHz） in a Nd60 Al10 Fe2o Co10 bulk metallic glass. Based on the experimental data, the sound velocity, density, elastic moduli and Debye temperature were derived as functions of pressure, and the Murnaghan＇ s equation of state was obtained. Moreover, the compression curve, the elastic constants and the Debye temperature of the bulk metallic glass are calculated on the basis of the similarity between their physical properties in the glass state and those in corresponding crystalline state. These results confirm that the elastic properties of Nd60Al10 Fe20 Co10 bulk metallic glass are related to its component elements.