Structure of ZrxPt100-x (73 <= x <= 77) metallic Glasses

TitleStructure of ZrxPt100-x (73 <= x <= 77) metallic Glasses
Publication TypeJournal Article
Year of Publication2008
AuthorsSordelet DJ, Ott RT, Li MZ, Wang SY, Wang CZ, Besser MF, Liu ACY, Kramer MJ
Journal TitleMetallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
Volume39A
Pages1908-1916
Date PublishedAug
Type of ArticleProceedings Paper
ISBN Number1073-5623
Accession NumberISI:000256886600021
Keywordsalloys, CHARACTERISTICS, CRYSTALLIZATION, devitrification, FLUCTUATION MICROSCOPY, growth, medium-range order, NANO-ICOSAHEDRAL PHASE, PD, QUASI-CRYSTALS
Abstract

The structure of hyper-eutectic ZrxPt100-x (73 <= x <= 77) metallic glasses produced by melt spinning was examined with high-energy synchrotron X-ray diffraction (HEXRD) and fluctuation electron microscopy. In addition, details of the amorphous structure were studied by combining ab initio molecular dynamics and reverse Monte Carlo simulations. Crystallization pathways in these glasses have been reported to vary dramatically with small changes in compositions; however, in the current study, the structures of the different glasses were also observed to vary with composition, particularly the prepeak in the total structure factor that occurs at a Q value of around 17 nm(-1). Results from simulations and fluctuation electron microscopy suggest that the medium-range order of the amorphous structure is characterized by extended groups of Pt-centered clusters that increase in frequency, structural order, or spatial organization at higher Pt contents. These clusters may be related to the Zr5Pt3 structure, which contains Pt-centered clusters coordinated by 9Zr and 2Pt atoms.

DOI10.1007/s11661-007-9335-y
Alternate JournalMetall. Mater. Trans. A-Phys. Metall. Mater. Sci.