Regularities of the effect of the value of initial bending stresses on their relaxation under the annealing of amorphous magnetically soft alloys of various classes

Resumo

It has been shown that, in some amorphous alloys, the value of initial bending stresses σ_m can influence the development of the relaxation of these stresses during the annealing of the alloys. These alloys include Co₆₉Fe_3.7Cr_3.8Si_12.5B₁₁, with a nearly zero saturation magnetostriction (λ_s < 10^–7) and the Fe₇₈Ni₁Si₈B₁₃ alloy with λ_s = 25 × 10^–6. In the iron-based Fe₈₁Si₄B₁₃C₂ and Fe₅₇Co₃₁Si_2.9B_9.1 alloys, no effect of the initial bending stresses on their relaxation has been observed. No this effect has also been observed in the metalloid-free alloys Со₈₀Mo₁₀Zr₁₀ and Со₈₀Mo₈Ni₂Zr₁₀ with a nearly zero saturation magnetostriction λ_s. When this effect manifests itself, the activation energy U of the given process becomes a function of two factors; i.e., this energy depends on both the composition of the alloy (that is, interatomic forces) and the value of the initial bending stresses. In this case, the activation energy U cannot be considered to be characteristic of the material.