Multiscale structures of Zr-based binary metallic glasses and the correlation with glass forming ability

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Detail(s)

Original languageEnglish
Pages (from-to)482-486
Journal / PublicationProgress in Natural Science: Materials International
Volume27
Issue number4
Online published24 Aug 2017
Publication statusPublished - Aug 2017

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Abstract

Thermal behaviors and structures of three Zr-based binary glass formers, Zr50Cu50, Zr64Cu36 and Zr64Ni36, were investigated and compared using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), high energy X-ray diffraction (XRD) and small angle X-ray scattering (SAXS). The high energy XRD results show that the bulk glass former Zr50Cu50 has a denser atomic packing efficiency and reduced medium-range order than those of marginal glass formers Zr64Cu36 and Zr64Ni36. Based on TEM observations for the samples after heat treatment at 10 K above their crystallization onset temperatures, the number density of crystals for Zr50Cu50 was estimated to be 1023–1024 m−3, which was four-orders higher than that in Zr64Cu36 and Zr64Ni36 metallic glasses. SAXS results indicate that Zr50Cu50 has higher degree of nanoscale inhomogeneities than those in Zr64Cu36 and Zr64Ni36 at as-cast state. The observed multiscale structures are discussed in terms of the phase stability and glass-forming ability of Zr-based binary glass formers.

Research Area(s)

  • Crystallization, Densely atomic packing, Glass forming ability, Metallic glasses, Nanoscale inhomogeneity

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