Abstract
The structure of hyper-eutectic Zr x Pt100−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.
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Acknowledgments
This work was supported by the United States Department of Energy, Office of Science, Office of Basic Energy Sciences, as follows: efforts at the Ames Laboratory were supported under Contract No. DE-AC02-07CH11358; use of the Advanced Photon Source was supported under Contract No. DE-AC02-06CH11357; and the fluctuation electron microscopy was performed in the Electron Microscopy Center at Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
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This article is based on a presentation given in the symposium entitled “Bulk Metallic Glasses IV,” which occurred February 25–March 1, 2007 during the TMS Annual Meeting in Orlando, Florida under the auspices of the TMS/ASM Mechanical Behavior of Materials Committee.
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Sordelet, D., Ott, R., Li, M. et al. Structure of Zr x Pt100−x (73 ≤ x ≤ 77) Metallic Glasses. Metall Mater Trans A 39, 1908–1916 (2008). https://doi.org/10.1007/s11661-007-9335-y
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DOI: https://doi.org/10.1007/s11661-007-9335-y