Novel method for construction of high performance nanocrystalline FeCuNbSiB toroidal core
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Date
2019-07-04
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Publisher
JOURNAL OF ALLOYS AND COMPOUNDS
Abstract
In the current study magnetic, magneto-optical and microstructural properties of the amorphous
Fe83Cu1Nb3Si5B8 alloy were properly investigated depending on the external treatments such as
annealing and stress annealing. Kinetic nanocrystallization temperatures of certain ribbon were determined
at the range of 500e510 C. The amorphous ribbons produced in the as-spun state were subjected
to tensile stress loading with and without rapid heat treatment of 510 C during 5 s. Behaviors of certain
ribbons were extensively investigated in terms of several factors such as magnetic properties, microstructural
evaluation, magneto-optical effects and structural deformation by means of quasi-static hysteresis
loops, XRD analyses, TEM micrographs, magneto-optical Kerr imaging and nanoindentation test.
Present nanocrystalline Fe83Cu1Nb3Si5B8 alloy have allowed yielding not only ultrafine grain structure of
around 7.02 nm but also saturation induction of 1.85 T, coercivity of 5.8 A.m 1 and saturation magnetostriction
of 6 ppm. Additionally, based upon determined optimum stress annealing circumstances,
toroidal nanocrystalline core was produced using a proposed stress induced winding (SIW) system. SIW
system based principally on the gradient of the rotational speed of each mandrel in the standard toroidal
core winding machine. Structural deformation of the core was determined by an analysis method performed
on the ribbon. Accordingly, induced elastic modulus (E), Poisson's ratio (V) and residual strain (ε)
in the ribbon under the influence of stress annealing by 200 MPa at 510 C were found as 7.9 GPa, 0.39
and 0.031, respectively.
Description
Keywords
Nanocrystalline alloy, Stress annealing, Stress induced winding system, Structural deformation