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
Main Authors: Byerly, K., Krimer, Y., Phatak, Charudatta, Theisen, E., McHenry, M. E.
Format: Article
Language:English
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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
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-021-00268-5