Tailoring crystallization phases in metallic glass nanorods via nucleus starvation

Sungwoo Sohn, Yujun Xie, Yeonwoong Jung, Jan Schroers and Judy J. Cha ()
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Sungwoo Sohn: Yale University
Yujun Xie: Yale University
Yeonwoong Jung: University of Central Florida
Jan Schroers: Yale University
Judy J. Cha: Yale University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Many physical phenomena deviate from their established frameworks when the system approaches relevant length scales governing the phenomena. In crystallization, the relevant length scales are the nucleation length set by the nucleus size and density, and the growth length set by diffusion fields. Here we observe unexpected crystallization phenomena at the nanoscale, using metallic glass (MG) nanorods and in situ transmission electron microscopy. The asymmetry between critical heating and cooling rates disappears for small MG nanorods. Strikingly, an apparent single crystalline phase with its composition similar to the glass composition is observed for very small rods, in contrast to bulk samples. We attribute this to the lack of nuclei in small MG nanorods that approach the nucleation length, thus coined the term, nucleus starvation. By controlling the MG nanorod diameter and crystallization kinetics, we can tune the number of nuclei in a nanorod, thereby tailoring the resulting crystallization phases.

Date: 2017
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DOI: 10.1038/s41467-017-02153-4

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