Abstract
The present paper deals with the improvement of a multi-scale approach describing the magneto-mechanical coupling of Fe-27wt%Co-0.5wt%Cr alloy. The magnetostriction behavior is demonstrated as very different (low magnetostriction vs. high magnetostriction) when this material is submitted to two different final annealing conditions after cold rolling. The numerical data obtained from a multi-scale approach are in accordance with experimental data corresponding to the high magnetostriction level material. A bi-domain structure hypothesis is employed to explain the low magnetostriction behavior, in accordance with the effect of an applied tensile stress. A modification of the multiscale approach is proposed to match this result.
Highlights
For several years, an increase of the electrical power is researched in the aeronautical field leading to an increasing number of electrical devices on board
Magnetostriction tests performed on strip samples have shown that annealing conditions after cold rolling induce a variation of the magnetostrictive behavior.[1]
Just above, is the polycrystalline scale considered as an assembly of grains and usually denoting the representative volume element (RVE)
Summary
An increase of the electrical power is researched in the aeronautical field leading to an increasing number of electrical devices on board. A good candidate for power transformers is the Fe-27wt%Co-0.5wt%Cr alloy exhibiting the highest saturation magnetization compared to the other magnetic materials This material leads to high level of noise emission due to its strong intrinsic magnetostriction. An annealing in ferritic domain (α phase) (material called FeCoB) brings on the contrary to a low magnetostriction over a wide induction range (±1,5T) (figure 1). These very different behaviors are obtained while crystallographic texture and grain size are strictly the same for both materials.[1] The assumption of a selection of magnetic bi-domains (magnetic domains separated by 180◦ domain wall) within the rolling plane has been emitted to explain the behavior of FeCoB. This modeling is complemented by new experimental results confirming the magnetic bi-domain configuration in FeCoB
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