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

Abstract：

: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. Here, 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zhang P,Maldonis JJ,Liu Z,Schroers J,Voyles PM

doi

10.1038/s41467-018-03604-2

subject

Has Abstract

pub_date

2018-03-19 00:00:00

pages

1129

issue

1

issn

2041-1723

pii

10.1038/s41467-018-03604-2

journal_volume

9

pub_type

杂志文章

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