Supercluster-coupled crystal growth in metallic glass forming liquids

Yujun Xie, Sungwoo Sohn, Minglei Wang, Huolin Xin, Yeonwoong Jung, Mark D. Shattuck, Corey S. O’Hern, Jan Schroers and Judy J. Cha ()
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Yujun Xie: Yale University
Sungwoo Sohn: Yale University
Minglei Wang: Yale University
Huolin Xin: Brookhaven National Laboratory
Yeonwoong Jung: University of Central Florida
Mark D. Shattuck: City College of the City University of New York
Corey S. O’Hern: Yale University
Jan Schroers: Yale University
Judy J. Cha: Yale University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract While common growth models assume a structure-less liquid composed of atomic flow units, structural ordering has been shown in liquid metals. Here, we conduct in situ transmission electron microscopy crystallization experiments on metallic glass nanorods, and show that structural ordering strongly affects crystal growth and is controlled by nanorod thermal history. Direct visualization reveals structural ordering as densely populated small clusters in a nanorod heated from the glass state, and similar behavior is found in molecular dynamics simulations of model metallic glasses. At the same growth temperature, the asymmetry in growth rate for rods that are heated versus cooled decreases with nanorod diameter and vanishes for very small rods. We hypothesize that structural ordering enhances crystal growth, in contrast to assumptions from common growth models. The asymmetric growth rate is attributed to the difference in the degree of the structural ordering, which is pronounced in the heated glass but sparse in the cooled liquid.

Date: 2019
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DOI: 10.1038/s41467-019-08898-4

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