Structural evaluation ofFe60Co10Zr8Mo5Nb2B15metallic glass under high pressure

Abstract

The structural evaluation of ${\mathrm{Fe}}_{60}{\mathrm{Co}}_{10}{\mathrm{Zr}}_{8}{\mathrm{Mo}}_{5}{\mathrm{Nb}}_{2}{\mathrm{B}}_{15}$ metallic glass has been investigated under high pressure up to 50 GPa at room temperature by x-ray diffraction synchrotron radiation. The amorphous structure is retained under these pressure conditions but exhibits distinct changes in the local atomic configuration with increasing pressure. The degree of short-range order determined from the x-ray diffraction data significantly decreases at pressures of 0--36.8 GPa. The quantitative determination of the corresponding coordination number (CN) of the atoms shows that the CN drops from 12 at ambient pressure to 7.44 at 36.8 GPa, suggesting that high pressure leads to a collapse of the initial atomic configuration of the amorphous structure. When compressing the sample at pressure above 36.8 GPa, the CN tends to increase with increasing pressure. The inherent structure evaluation driven by pressure will be discussed.