Compression Behaviour of Bulk Metallic Glasses and Binary Amorphous Alloy

The compression properties of Zr₄₁Ti₁₄Cu_12.5Ni₁₀Be_22.5, Zr_44.4Nb₇Cu_13.5Ni_10.8Be_24.3 bulk metallic glasses and Ni₇₇P₂₃ binary amorphous alloy are investigated at room temperature up to 24GPa, 39GPa and 30.5GPa, respectively, using in-situ high pressure energy dispersive x-ray
diffraction with a synchrotron radiation source. The pressure--volume
relationship of Ni₇₇P₂₃ amorphous alloy is consistent well with the second order Birch--Murnaghan (B-M) equation within the experimental pressure range. However, under higher pressure, the experimental data of Zr-based specimens deviate from the B-M equation. Compare to the binary amorphous alloy, less excess free volume existing in the bulk metallic glass and multi-component atomic configuration results in a two-stage relationship between
compressibility and pressure.