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- Title
The Effects of Strain-Annealing on Tuning Permeability and Lowering Losses in Fe-Ni-Based Metal Amorphous Nanocomposites.
- Authors
Aronhime, Natan; DeGeorge, Vincent; Keylin, Vladimir; Ohodnicki, Paul; McHenry, Michael
- Abstract
Fe-Ni-based metal amorphous nanocomposites with a range of compositions (FeNi)NbSiB (30 ≤ x ≤ 70) are investigated for motor and transformer applications, where it is beneficial to have tunable permeability. It is shown that strain annealing offers an effective method for tuning permeability in these alloys. For an Fe-rich alloy, permeability increased from 4000 to 16,000 with a positive magnetostriction. In a Ni-rich alloy, permeability decreased from 290 to 40 with a negative magnetostriction. Significant elongations (above 60%) are observed during strain annealing at high stress. Crystallization products have been determined in all alloys heated to 480°C. γ-FeNi is formed in all alloys, while (FeNi)NbSiB also undergoes secondary crystallization at temperatures of approximately 480°C to form a phase with the CrC-type structure and a likely composition of FeNbB. Toroidal losses have been measured for (FeNi)NbSiB (0 ≤ y ≤ 3) at various annealing temperatures. At an induction of 1 T and frequency of 400 Hz and 1 kHz, the toroidal losses obtained are W = 0.9 W/kg and W = 2.3 W/kg, respectively. These losses are lower than losses recently reported for state of the art 3.0% and 6.5% silicon steels, a Metglas Fe-based amorphous alloy, and some Fe-based nanocomposites.
- Subjects
NANOCOMPOSITE materials; IRON-nickel alloys; STRAIN rate; ANNEALING of crystals; PERMEABILITY; MAGNETOSTRICTION; CRYSTALLIZATION; AMORPHOUS alloys
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2017, Vol 69, Issue 11, p2164
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-017-2480-x