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Nucleation of fractal nanocrystallites upon annealing of Fe-based metallic glass

Published online by Cambridge University Press:  13 March 2017

Jiecheng Diao
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China
Bo Chen*
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China; and London Centre for Nanotechnology, University College London, London WC1H 0AH, U.K.
Qiang Luo
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China
Wei Lin
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China
Xianping Liu
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China
Jun Shen
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China
Ian Robinson
Affiliation:
School of Materials Science and Engineering, TongJi University, Shanghai 201804, China; London Centre for Nanotechnology, University College London, London WC1H 0AH, U.K.; and Division of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA
*
a) Address all correspondence to this author. e-mail: irobinson@bnl.gov
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Abstract

Bragg coherent X-ray diffraction imaging has been used to determine the structure of the initial clusters of α-Fe nano crystals which form upon annealing of an iron-based amorphous alloy or metallic glass. The method is able to identify the shapes and strain of these crystallites without any need for cutting the sample, so can visualize them in three dimensions in their intact state. In this way, the delicate dendritic structures on the exterior of the crystallites can be seen and its density versus radius relationship identifies a fractal dimension of the porous region that is consistent with diffusion-limited aggregation models. The crystal sizes were found to be around 60 nm after annealing at 700 °C growing to about 330 nm after annealing at 750 °C. This article introduces the BCDI method and describes its application to characterize previously recrystallized samples of iron-based amorphous alloys. It paves the way for a possible future in situ nucleation/growth investigation of the relationship between kinetics and nanostructure of metallic glass.

Type
Invited Reviews
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Chris Nicklin

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

References

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