Elastic constants of Pd39Ni10Cu30P21 bulk metallic glass under high pressure

The pressure-dependent acoustic velocities of a Pd39Ni10Cu30P21 bulk metall ic glass (BMG) have been measured up to 0.5 GPa by using an ultrasonic tech nique with the pulse echo overlap method. The elastic constants, the Debye temperature, and their pressure dependence are obtained. The isothermal equ ation of state (EOS) of the BMG is established in terms of the Murnaghan fo rm. The atomic configurations of the BMG are discussed by comparing the ela stic constants and the EOS with those of its metallic component and of othe r amorphous materials. (C) 2000 American Institute of Physics. [S0003- 6951 (00)04349-7].