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

Diao, J; Chen, B; Luo, Q; Lin, W; Liu, X; Shen, J; Robinson, I; (2017) Nucleation of fractal nanocrystallites upon annealing of Fe-based metallic glass. [Review]. Journal of Materials Research , 32 (10) pp. 1880-1887. 10.1557/jmr.2017.79. Green open access

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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: Article
Title: Nucleation of fractal nanocrystallites upon annealing of Fe-based metallic glass
Open access status: An open access version is available from UCL Discovery
DOI: 10.1557/jmr.2017.79
Publisher version: http://doi.org/10.1557/jmr.2017.79
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: X-ray diffraction, (XRD)crystal, growthnanostructure
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1561467
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