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Title: Surface oxidation and crystallization of FeNi-Based soft magnetic nanocrystalline and amorphous nanocomposite alloys

Abstract

In this work, we present characterization of surface oxidation and crystallization behavior of Metal Amorphous Nanocomposite (MANC) (Fe70Ni30)80Nb4Si2B14 alloys via complementary x-ray diffraction, electron microscopy, and x-ray photoelectron spectroscopy techniques. An adherent amorphous oxide of roughly 15–20 nm in thickness is observed on the wheel side of the ribbon, enriched in Fe relative to Ni and with significant content of Si and Nb as would be expected based upon a comparison of the Gibbs free energy of formation of the stable oxide phases. The amorphous character of the oxide is likely to result from the significant Si-content coupled with the amorphous and nanocrystalline character of the underlying metallic layer. Higher density of FeNi-enriched nanocrystals is also observed within ~100 nm of the wheel-side surface, presumably due to reduction in local glass former concentration. A rough, crystalline copper oxide layer is also present and forms through contact between the copper wheel and the solidifying melt during the rapid solidification process. On the air side of the ribbon, a crystalline oxide layer of ~15–20 nm is formed as well as intergranular oxidation that penetrates along the grain boundaries between highly textured surface crystallites of ~50–100 nm in size. The crystalline nature ofmore » the oxide on these surfaces is asserted to result from the lack of significant Si-content and the pre-existing surface crystallites that form during the rapid solidification process which promote a crystalline oxide surface layer. Furthermore, these results shed new insights into the details of surface oxidation and can help to inform processing and alloy composition adjustments which seek to tailor surface properties.« less

Authors:
 [1];  [2];  [3];  [3];  [2];  [2];  [2];  [4];  [2]
+ Show Author Affiliations
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); Univ. of Pittsburgh, PA (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  3. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
  4. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); Leidos Research Support Team, Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1824286
Alternate Identifier(s):
OSTI ID: 1616361
Grant/Contract Number:  
EE0007867
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 834; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ohodnicki, P., Egbu, J., Yu, Y., Baltrus, J., Aronhime, N., Krimer, Y., Anand, P., Byerly, K., and McHenry, M. E. Surface oxidation and crystallization of FeNi-Based soft magnetic nanocrystalline and amorphous nanocomposite alloys. United States: N. p., 2020. Web. doi:10.1016/j.jallcom.2020.155038.
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Ohodnicki, P., Egbu, J., Yu, Y., Baltrus, J., Aronhime, N., Krimer, Y., Anand, P., Byerly, K., & McHenry, M. E. Surface oxidation and crystallization of FeNi-Based soft magnetic nanocrystalline and amorphous nanocomposite alloys. United States. https://doi.org/10.1016/j.jallcom.2020.155038
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Ohodnicki, P., Egbu, J., Yu, Y., Baltrus, J., Aronhime, N., Krimer, Y., Anand, P., Byerly, K., and McHenry, M. E. Tue . "Surface oxidation and crystallization of FeNi-Based soft magnetic nanocrystalline and amorphous nanocomposite alloys". United States. https://doi.org/10.1016/j.jallcom.2020.155038. https://www.osti.gov/servlets/purl/1824286.
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@article{osti_1824286,
title = {Surface oxidation and crystallization of FeNi-Based soft magnetic nanocrystalline and amorphous nanocomposite alloys},
author = {Ohodnicki, P. and Egbu, J. and Yu, Y. and Baltrus, J. and Aronhime, N. and Krimer, Y. and Anand, P. and Byerly, K. and McHenry, M. E.},
abstractNote = {In this work, we present characterization of surface oxidation and crystallization behavior of Metal Amorphous Nanocomposite (MANC) (Fe70Ni30)80Nb4Si2B14 alloys via complementary x-ray diffraction, electron microscopy, and x-ray photoelectron spectroscopy techniques. An adherent amorphous oxide of roughly 15–20 nm in thickness is observed on the wheel side of the ribbon, enriched in Fe relative to Ni and with significant content of Si and Nb as would be expected based upon a comparison of the Gibbs free energy of formation of the stable oxide phases. The amorphous character of the oxide is likely to result from the significant Si-content coupled with the amorphous and nanocrystalline character of the underlying metallic layer. Higher density of FeNi-enriched nanocrystals is also observed within ~100 nm of the wheel-side surface, presumably due to reduction in local glass former concentration. A rough, crystalline copper oxide layer is also present and forms through contact between the copper wheel and the solidifying melt during the rapid solidification process. On the air side of the ribbon, a crystalline oxide layer of ~15–20 nm is formed as well as intergranular oxidation that penetrates along the grain boundaries between highly textured surface crystallites of ~50–100 nm in size. The crystalline nature of the oxide on these surfaces is asserted to result from the lack of significant Si-content and the pre-existing surface crystallites that form during the rapid solidification process which promote a crystalline oxide surface layer. Furthermore, these results shed new insights into the details of surface oxidation and can help to inform processing and alloy composition adjustments which seek to tailor surface properties.},
doi = {10.1016/j.jallcom.2020.155038},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 834,
place = {United States},
year = {Tue Apr 07 00:00:00 EDT 2020},
month = {Tue Apr 07 00:00:00 EDT 2020}
}
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https://doi.org/10.1016/j.jallcom.2020.155038
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