Nanostructure refinement and phase formation of flash annealed FeNi-based soft magnetic alloys

Talaat, A.; Egbu, J.; Phatak, C.; Byerly, K.; McHenry, M. E.; Ohodnicki, Jr., P. R.

doi:10.1016/j.materresbull.2022.111839

Nanostructure refinement and phase formation of flash annealed FeNi-based soft magnetic alloys

Journal Article · Tue Mar 29 04:00:00 EDT 2022 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2022.111839· OSTI ID:1869911

^[1]; Egbu, J. ^[2]; ^[3]; ^[2]; McHenry, M. E. ^[2]; Ohodnicki, Jr., P. R. ^[1]

Univ. of Pittsburgh, PA (United States)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

In this work, the resulting nanocomposite microstructures of FeNi nanocrystallites under different heating and cooling rates (5 °C/min vs 400-500 °C/s) is investigated. Conventional furnace annealing under low heating rates and slow cooling resulted in both BCC α-FeNi and FCC γ-FeNi nanocrystallites with an average grain size on the order of 25-27 nm whereas high heating rates achieved via flash annealing techniques have enabled a dramatically refined microstructure consisting of 5-7 nm grains with FCC γ-FeNi phase and found to be the dominant phase following primary crystallization. Grain size refinement and phase identity optimization yielded low values of coercivities-17 A/m and high permeability similar to 11 x 10³ measured at 400 Hz/1 kA/m in flash annealed samples at 450 °C for 5 s. The magnetic behavior and the underlying mechanism of optimal soft magnetic properties are discussed in terms of the critical role of the grain size in domain wall pinning and coercivity.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; US Department of the Navy, Office of Naval Research (ONR)

Grant/Contract Number:: AC02-06CH11357; EE0008870

OSTI ID:: 1869911

Alternate ID(s):: OSTI ID: 1860949

Journal Information:: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 152; ISSN 0025-5408

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Nanostructure refinement and phase formation of flash annealed FeNi-based soft magnetic alloys

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