Correlation between primary phases and atomic clusters in a Zr-based metallic glass

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number123516
Journal / PublicationJournal of Applied Physics
Volume108
Issue number12
Publication statusPublished - 15 Dec 2010
Externally publishedYes

Abstract

Atomic clusters exiting in the Zr65Ti10Ni 25 metallic glass and primary phases generated during crystallization were studied by x-ray scattering and high-resolution transmission microscopy. An intrinsic correlation between the atomic clusters and the primary phases has been revealed. It is found that there are topological icosahedral short-range orders (ISROs) in the as-cast sample in addition to fcc-Zr2 Ni -type chemical SROs. These topological ISRO and fcc-Zr2 Ni -type chemical SRO can simultaneously quasicrystallize/crystallize into the corresponding nanoscaled icosahedral quasicrystalline phase (I-phase) and fcc-Zr2 Ni crystal as primary products during crystallization. The synchronic precipitation of these two metastable phases can be understood in terms of their structural similarity between the fcc-Zr2 Ni and I-phase in local atomic configuration. In comparison with fcc-Zr2 Ni crystal, the I-phase has a smaller size and lower volume fraction due to its lower growth rate attributed to its more complex composition and higher structural symmetry. The competitive growth between these two phases results in the development of nanostructured materials in this alloy after annealing. © 2010 American Institute of Physics.