Nanoscale size effects in crystallization of metallic glass nanorods

Nature Communications
Sungwoo SohnJudy J Cha

Abstract

Atomistic understanding of crystallization in solids is incomplete due to the lack of appropriate materials and direct experimental tools. Metallic glasses possess simple metallic bonds and slow crystallization kinetics, making them suitable to study crystallization. Here, we investigate crystallization of metallic glass-forming liquids by in-situ heating metallic glass nanorods inside a transmission electron microscope. We unveil that the crystallization kinetics is affected by the nanorod diameter. With decreasing diameters, crystallization temperature decreases initially, exhibiting a minimum at a certain diameter, and then rapidly increases below that. This unusual crystallization kinetics is a consequence of multiple competing factors: increase in apparent viscosity, reduced nucleation probability and enhanced heterogeneous nucleation. The first two are verified by slowed grain growth and scatter in crystallization temperature with decreasing diameters. Our findings provide insight into relevant length scales in crystallization of supercooled metallic glasses, thus offering accurate processing conditions for predictable metallic glass nanomolding.

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Citations

Jan 21, 2016·Scientific Reports·Daniel J MagagnoscDaniel S Gianola
Jul 14, 2017·Nanoscale·Pooja RaniAnandh Subramaniam
Dec 8, 2017·Nature Communications·Sungwoo SohnJudy J Cha
Nov 8, 2018·Faraday Discussions·Benedikt Kersting, Martin Salinga
Jun 18, 2019·Physical Chemistry Chemical Physics : PCCP·Yunrui DuanHui Li
Feb 24, 2019·Nature Communications·Yujun XieJudy J Cha
Apr 4, 2020·Advanced Materials·Bart J Kooi, Matthias Wuttig
Jun 6, 2017·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Sriram VijayanMark Aindow
Nov 22, 2019·Nature Communications·Yuan TianMingwei Chen
Dec 7, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Fangzheng Chen, Donghua Xu
Aug 5, 2020·Nature Nanotechnology·Wei YanFabien Sorin
Jun 20, 2018·Nature Materials·Martin SalingaAbu Sebastian
Feb 4, 2021·The Journal of Physical Chemistry Letters·Tianpei GeQun Xu
Jun 22, 2021·ACS Nano·Debaditya ChatterjeePaul M Voyles
Oct 16, 2019·ACS Applied Materials & Interfaces·Mario BehrensBernd Rauschenbach
Oct 9, 2021·Science Advances·Hyeuk Jin HanJudy J Cha

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Methods Mentioned

BETA
differential scanning calorimetry
electron diffraction
X-ray

Software Mentioned

TurboReg
Snagit
ImageJ

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