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Plasmon energy changes in FeMo14C15B6Erx (x=0-2) bulk metallic glass during in-situ heating

Sengo Kobayashi1*, James Howe2*, Mitsuhiro Murayama3*

1 Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan

2 Department of Materials Science & Engineering, University of Virginia, Charlottesville, VA 22904-4745, USA

3 Department of Materials Science & Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA

* Corresponding authors emails: kobayashi.sengo.me@ehime-u.ac.jp, jh9s@virginia.edu, murayama@vt.edu
DOI10.24435/materialscloud:q5-tn [version v1]

Publication date: May 06, 2021

How to cite this record

Sengo Kobayashi, James Howe, Mitsuhiro Murayama, Plasmon energy changes in FeMo14C15B6Erx (x=0-2) bulk metallic glass during in-situ heating, Materials Cloud Archive 2021.70 (2021), doi: 10.24435/materialscloud:q5-tn.

Description

Variations of volume plasmon energy of both ribbon and bulk FeMo14C15B6Erx (x=0-2) metallic glasses were measured as a function of the temperature in an analytical transmission electron microscope using valence electron energy loss spectroscopy (VEELS). The plasmon energy was found to decrease with increasing temperature, due not only to thermal expansion but also to chemical reordering in the glasses. The chemical reordering stimulates a specific solute cluster formation; M23(C, B)6 solute clusters began to form above about 200°C in both ribbon and bulk FeMo14C15B6Erx (x=0, 0.5, 1) metallic glasses. The formation of the M23(C, B)6 solute clusters was only found above 400°C in the ribbon FeMo14C15B6Er2 metallic glass, indicating inhibition of the M23(C, B)6 solute clusters occurred owing to the formation of Er-(C, B) complexes/clusters. The Er-(C, B) complexes/clusters were formed in the cooling process of the sample fabrication. In contrast to the ribbon sample, the formation of the M23(C, B)6 solute clusters did not occur in the bulk FeMo14C15B6Er2 metallic glass during heating. The amount of the Er-(C, B) complexes/clusters in the bulk sample was larger than that in the ribbon sample because of the slow cooling rate in the bulk sample fabrication. Because the solute carbon and boron atoms were mostly consumed by the formation of Er-(C, B) complexes/clusters in the bulk FeMo14C15B6Er2 metallic glass, the formation of M23(C, B)6 solute clusters was suppressed. This study demonstrates that chemical reordering during the relaxation of metallic glasses can be detected by the VEELS, providing valuable insight into the relaxation stage of metallic glass during heating.

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Files

File name Size Description
raw data-paper-FeMoCBEr-BMG-EELS (by SK-JMH-MM) submit to APL.xlsx
MD5md5:970d59ef535ba1a9d5c1c185cd9ab4a8
19.0 KiB The raw data in an excel sheet to reproduce the plots of the related publication. It contains values of plasmon energy, the density of electrons, and the calculated density of electrons with thermal dilatation during heating.

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference
S. Kobayashi, J. Howe, M. Murayama (in preparation)

Keywords

Volume plasmon Bulk metallic glass Chemical reordering In-situ heating Electron energy loss spectroscopy Experimental

Version history:

2021.70 (version v1) [This version] May 06, 2021 DOI10.24435/materialscloud:q5-tn