The Effects of Strain-Annealing on Tuning Permeability and Lowering Losses in Fe-Ni-Based Metal Amorphous Nanocomposites

Fe-Ni-based metal amorphous nanocomposites with a range of compositions (Fe 100− x Ni x ) 80 Nb 4 Si 2 B 14 (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 t...

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Bibliographic Details
Published in:JOM (1989) 2017-11, Vol.69 (11), p.2164-2170
Main Authors: Aronhime, Natan, DeGeorge, Vincent, Keylin, Vladimir, Ohodnicki, Paul, McHenry, Michael E.
Format: Article
Language:English
Subjects:
Alloys
Anisotropy
Annealing
Chemistry/Food Science
Cost control
Crystallization
Earth Sciences
Elongation
Engineering
Environment
Ferrous alloys
Investigations
Magnetism
Magnetostriction
MATERIALS SCIENCE
Mechanical properties
Metallic glasses
Nanocomposites
Nickel base alloys
Permeability
Physics
Silicon
Silicon steels
Strain annealing
Temperature
Tuning
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Summary:Fe-Ni-based metal amorphous nanocomposites with a range of compositions (Fe 100− x Ni x ) 80 Nb 4 Si 2 B 14 (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 (Fe 30 Ni 70 ) 80 Nb 4 Si 2 B 14 also undergoes secondary crystallization at temperatures of approximately 480°C to form a phase with the Cr 23 C 6 -type structure and a likely composition of Fe 21 Nb 2 B 6 . Toroidal losses have been measured for (Fe 70 Ni 30 ) 80 Nb 4 Si y B 16− y (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 1.0T, 400 Hz  = 0.9 W/kg and W 1.0T, 1 kHz  = 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.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-017-2480-x