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Title: Nanostructure and compositional segregation of soft magnetic FeNi-based nanocomposites with multiple nanocrystalline phases

Abstract

Soft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co-rich and FeNi-based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi-phase crystallization processes have been reported for Co-rich alloys but relatively few have investigated FeNi-based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi-based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high-resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb-enriched shell surrounding nanocrystals.

Authors:
 [1];  [2]; ORCiD logo [2];  [3];  [3];  [3];  [3];  [4]
+ Show Author Affiliations
  1. Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Carnegie Mellon Univ., Pittsburgh, PA (United States). Materials Science and Engineering
  4. NASA Glenn Research Center, Cleveland, OH (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1812731
Report Number(s):
PNNL-SA-155230
Journal ID: ISSN 0884-2914
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 36; Journal Issue: 1; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanocrystalline material; soft magnetic materials; soft magnetic metal amorphous nanocomposite; MANC; TEM; atom probe tomography (APT)

Citation Formats

Ohodnicki, P., Kautz, E. J., Devaraj, A., Yu, Y., Aronhime, N., Krimer, Y., McHenry, M. E., and Leary, A. Nanostructure and compositional segregation of soft magnetic FeNi-based nanocomposites with multiple nanocrystalline phases. United States: N. p., 2021. Web. doi:10.1557/s43578-020-00066-5.
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Ohodnicki, P., Kautz, E. J., Devaraj, A., Yu, Y., Aronhime, N., Krimer, Y., McHenry, M. E., & Leary, A. Nanostructure and compositional segregation of soft magnetic FeNi-based nanocomposites with multiple nanocrystalline phases. United States. https://doi.org/10.1557/s43578-020-00066-5
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Ohodnicki, P., Kautz, E. J., Devaraj, A., Yu, Y., Aronhime, N., Krimer, Y., McHenry, M. E., and Leary, A. Thu . "Nanostructure and compositional segregation of soft magnetic FeNi-based nanocomposites with multiple nanocrystalline phases". United States. https://doi.org/10.1557/s43578-020-00066-5. https://www.osti.gov/servlets/purl/1812731.
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@article{osti_1812731,
title = {Nanostructure and compositional segregation of soft magnetic FeNi-based nanocomposites with multiple nanocrystalline phases},
author = {Ohodnicki, P. and Kautz, E. J. and Devaraj, A. and Yu, Y. and Aronhime, N. and Krimer, Y. and McHenry, M. E. and Leary, A.},
abstractNote = {Soft magnetic metal amorphous nanocomposite alloys are produced through rapid solidification and thermal annealing yielding nanocrystals embedded within an amorphous precursor. Similar free energies in Co-rich and FeNi-based alloy systems result in multiple nanocrystalline phases being formed during devitrification. Studies of multi-phase crystallization processes have been reported for Co-rich alloys but relatively few have investigated FeNi-based systems. A detailed characterization of compositional partitioning and microstructure of an optimally annealed FeNi-based MANC (Fe70Ni30)80Nb4Si2B14 alloy is presented through complementary high-resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). HRTEM demonstrates orientation relationships between FCC and BCC nanocrystals, suggesting heterogeneous nucleation of nanocrystals in the amorphous matrix or a cooperative mechanism of nucleation between BCC and FCC nanocrystallites. APT results show evidence for (i) the segregation of Fe and Ni between nanocrystals of different phases, (ii) B partitioning to the amorphous phase, and (iii) an Nb-enriched shell surrounding nanocrystals.},
doi = {10.1557/s43578-020-00066-5},
journal = {Journal of Materials Research},
number = 1,
volume = 36,
place = {United States},
year = {Thu Feb 04 00:00:00 EST 2021},
month = {Thu Feb 04 00:00:00 EST 2021}
}
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Publisher's Version of Record
https://doi.org/10.1557/s43578-020-00066-5
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