Residual quenching stresses in amorphous ferromagnetic wires produced by an in-rotating-water spinning process

Abstract

The residual stress-tensor components in amorphous ferromagnetic wire produced by an 'in-rotating-water' spinning process are calculated on the basis of the theory of viscoelasticity. The viscoelastic behaviour of the solidifying wire near the point of vitrification is studied and the effect of the relaxation process on the residual quenching stresses is clearly elucidated. The radial dependence of the residual stress-tensor components obtained is consistent with the magnetic behaviour of amorphous wire with small negative saturation magnetostriction. The residual stress amplitude is investigated as the function of wire radius and the parameters of the cooling process.

The effect of magnetoelastic interaction on the GMI behaviour of Fe-, Co- and Co–Fe-based amorphous wires

“…The magnetoelastic behaviour of the as cast wire is associated with the coupling between the magnetostriction and the internal stress induced during the rapid quenching process. The magnetoelastic energy associated with the sample can be expressed [23,24] as…”

High-Frequency Electric Properties of Amorphous Soft Magnetic Cobalt-Based Alloys in the Region of Transition to the Paramagnetic State

“…Reasons for the occurrence of the given phases may be either chemical stratification consisting in a radial dependence of the concentration of separate elements of the alloy or considerable internal stresses arising during wire manufacture and non-uniformly distributed throughout the volume. In the case of non-uniform distribution of internal stresses, the wire core appears radially stretched, and the subsurface layer appears radially compressed [10]. As a result, the interatomic distance in the internal wire region will be greater than in the subsurface one, which will be manifested through the magnitude of the exchange interaction and consequently, will be equivalent to the presence of two ferromagnetic phases with different Curie temperatures.…”

Temperature Dependence of Magnetoimpedance and Anisotropy in Nanocrystalline Finemet Wire

“…This domain structure is ultimately determined by the energetic balance between the local stray fields and the magnetoelastic anisotropy distributed according to the internal stresses frozen-in during the quenching process [8], [22] However, one should take into account the change of the stress distribution with the temperature. Due to the specific symmetry of wires an existence of the thermal expansion, which is proportional to the temperature produces strong radial and circular stresses when temperature changes [23]. Hence, the domain structure changes sensitively with the measuring temperature, because it changes the anisotropy present in the sample.…”