Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy

Zhang, Pei; Maldonis, Jason J.; Liu, Ze; Schroers, Jan; Voyles, Paul M.

doi:10.1038/s41467-018-03604-2

Title: Spatially heterogeneous dynamics in a metallic glass forming liquid imaged by electron correlation microscopy

Journal Article · 19 March 2018 · Nature Communications

DOI: https://doi.org/10.1038/s41467-018-03604-2 · OSTI ID:1526297

Zhang, Pei ^[1];

^[1]; Liu, Ze ^[2]; Schroers, Jan ^[2];

^[1]

Univ. of Wisconsin, Madison, WI (United States)
Yale Univ., New Haven, CT (United States)

Supercooled liquids exhibit spatial heterogeneity in the dynamics of their fluctuating atomic arrangements. The length and time scales of the heterogeneous dynamics are central to the glass transition and influence nucleation and growth of crystals from the liquid. In this work, we report direct experimental visualization of the spatially heterogeneous dynamics as a function of temperature in the supercooled liquid state of a Pt-based metallic glass, using electron correlation microscopy with sub-nanometer resolution. An experimental four-point space-time correlation function demonstrates a growing dynamic correlation length, ξ, upon cooling of the liquid toward the glass transition temperature. ξ as a function of the relaxation time τ are in good agreement with Adam-Gibbs theory, inhomogeneous mode-coupling theory and random first-order transition theory of the glass transition. The same experiments demonstrate the existence of a nanometer thickness near-surface layer with order of magnitude shorter relaxation time than inside the bulk.

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Research Organization:: Yale Univ., New Haven, CT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0004889; DMR-1121288; DMR-1506564

OSTI ID:: 1526297

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 70 works

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