Magnetostrictive loss reduction through stress relief annealing in an FeNi-based metal amorphous nanocomposite
FeNi-based metal amorphous nanocomposite alloys are emerging soft magnetic materials with promise for high-speed motor applications. Here we demonstrate a technique to optimize magnetic properties in toroidal cores wound from strain annealed (Fe 70 Ni 30 ) 80 Nb 4 Si 2 B 14 amorphous metal ribbon (A...
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Published in: | Journal of materials research 2021-07, Vol.36 (14), p.2843-2855 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | FeNi-based metal amorphous nanocomposite alloys are emerging soft magnetic materials with promise for high-speed motor applications. Here we demonstrate a technique to optimize magnetic properties in toroidal cores wound from strain annealed
(Fe
70
Ni
30
)
80
Nb
4
Si
2
B
14
amorphous metal ribbon (AMR). In-line strain annealing (SA) of the AMR yields a strip permeability that monotonically decreases with increasing SA tensions. After winding into toroidal cores, dramatic changes in magnetic properties are observed and determined to be of magnetostrictive origin. A procedure to re-anneal wound toroidal cores to reduce hysteresis and reverse magnetostrictive effects is developed inclusive of casting curvature effects. We investigate re-annealing temperatures between 300 – 470 °C for cores produced from each SA condition. Magnetic core loss, W
L
, coercivity, H
c
, squareness ratio, K
r
, and permeability, µ
r
are measured as a function of (stress relief) re-annealing temperature to optimally achieve W
1T,400 Hz
= 0.51 W/kg, H
c
= 2.42 A/m, K
r
= 0.22, and µ
r
= 35,300.
Graphical abstract |
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ISSN: | 0884-2914 2044-5326 |
DOI: | 10.1557/s43578-021-00268-5 |