Analysis of structural parameters of amorphous alloy Zr62Cu22Fe5Al10Dy1 after severe plastic deformation according to XRD data

Abstract

This article analyzes a zirconium-based bulk metallic glass (BMG) with the composition Zr62Cu22Fe5Al10Dy1 in its initial state and after high-pressure torsion (HPT). Structural changes in the BMG induced by HPT can be investigated through X-ray diffraction (XRD) analysis by assessing their impact on key XRD parameters, such as the center of gravity of the amorphous halo, its full width at half maximum (FWHM) and halo asymmetry. However, specific approaches and methods are required to describe the experimental halo, determine its center of gravity, FWHM and asymmetry. The article aims to identify approaches for the mathematical description of the experimental halo. The article analyzes and compares the results of describing a morphic halo using the EVA program, a Gaussian and a bigaussian. The results of analysis and comparison of halos in different states demonstrated that high-pressure torsion increases the FWHM of the amorphous halo in the alloy.