Exafs and dilatometric analysis of structural rearrangement after annealing in a Zr-based bulk metallic glass

Abstract

The atomic-scale structural rearrangement of a Zr-41.2 Ti13.8Cu12.5 Ni10Be22.5 bulk metallic glass has been investigated in relation to the duration of annealing time at 430 degrees C by applying both dilatometric measurements and extended X-ray absorption fine structure (EXAFS) spectroscopy. The phase-shifted distance between first shells of Zr atoms (R-P) was 2.95 angstrom by EXAFS and the average nearest-neighbor distance r(0) calculated from dilatometry was 3.2 angstrom. From the results, the progress of structural relaxation caused by the annihilation of free volume could be revealed as the annealing time increases.