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Cooling rate dependence of structural order in Ni62Nb38 metallic glass

TitleCooling rate dependence of structural order in Ni62Nb38 metallic glass
Publication TypeJournal Article
Year of Publication2018
AuthorsWen, TQ, Sun, Y, Ye, BL, Tang, L, Yang, ZJ, Ho, KM, Wang, CZ, Wang, N
JournalJournal of Applied Physics
Volume123
Pagination045108
Date Published01
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000423875800048
Keywordsamorphous-alloys, crystal genes, Cu-Zr, mechanical-properties, Medium-range order, model, molecular-dynamics simulation, percolation, physics, stability, supercooled liquid
Abstract

Molecular dynamics (MD) simulations are performed to study the structure of Ni62Nb38 bulk metallic glass at the atomistic level. Structural analysis based on the cluster alignment method is carried out and a new Ni-centered distorted-icosahedra (DISICO) motif is excavated. We show that the short-range order and medium-range order in the glass are enhanced with lower cooling rate. Almost 50% of the clusters around the Ni atoms in the well-annealed Ni62Nb38 glass sample from our MD simulations can be classified as DISICO. It is revealed that the structural distortion with respect to the perfect icosahedra is driven by chemical ordering in the distorted region of the DISICO motif. The relationship between the structure, energy, and dynamics in this glass-forming alloy during the cooling and annealing processes is also established. Published by AIP Publishing.

DOI10.1063/1.5019681
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Structures and Dynamics