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Electron Correlation Microscopy: A New Technique for Studying Local Atom Dynamics Applied to a Supercooled Liquid

Published online by Cambridge University Press:  03 June 2015

Li He ,
Pei Zhang ,
Matthew F. Besser ,
Matthew Joseph Kramer  and
Paul M. Voyles
Li He*
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
Pei Zhang
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
Matthew F. Besser
Affiliation:
Ames Laboratory, Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
Matthew Joseph Kramer
Affiliation:
Ames Laboratory, Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA
Paul M. Voyles*
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA
*
*Corresponding author. lhe32@wisc.edu; paul.voyles@wisc.edu
*Corresponding author. lhe32@wisc.edu; paul.voyles@wisc.edu
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Abstract

Electron correlation microscopy (ECM) is a new technique that utilizes time-resolved coherent electron nanodiffraction to study dynamic atomic rearrangements in materials. It is the electron scattering equivalent of photon correlation spectroscopy with the added advantage of nanometer-scale spatial resolution. We have applied ECM to a Pd40Ni40P20 metallic glass, heated inside a scanning transmission electron microscope into a supercooled liquid to measure the structural relaxation time τ between the glass transition temperature Tg and the crystallization temperature, Tx. τ determined from the mean diffraction intensity autocorrelation function g2(t) decreases with temperature following an Arrhenius relationship between Tg and Tg+25 K, and then increases as temperature approaches Tx. The distribution of τ determined from the g2(t) of single speckles is broad and changes significantly with temperature.

Keywords

electron correlation microscopyfluctuation electron microscopyx-ray photon correlation spectroscopybulk metallic glassscanning transmission electron microscopy
Type
Materials Applications and Techniques
Information
Microscopy and Microanalysis , Volume 21 , Issue 4 , August 2015 , pp. 1026 - 1033
Copyright
© Microscopy Society of America 2015 

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