Correlation Between Magnetic Properties and Allotropic Phase Transition of Fe-Co-V Alloy

doi:10.1007/s40195-015-0294-9

Abstract

Abstract:

In this study, the allotropic phase transition and its effect on the magnetic behavior of FeCo-7 wt%V alloy were investigated. It was found that γ phase is observed in the microstructure in the as-cast condition, and it diminishes after severe cold rolling (90% reduction). After annealing at temperatures higher than 500 up to 750 °C, the γ phase is observed in the structure, again. But, this phase is disappeared by annealing at temperatures above 750 °C due to the formation of vanadium-rich precipitates. Thermocalc software was used in order to elucidate the influence of vanadium percent on the stability of γ phase in Fe-Co alloys. Also, magnetic studies showed that the saturation induction is reduced by annealing at temperatures from 500 up to 750 °C, which is related to the formation of residual non-magnetic γ phase.

Key words: Fe-Co-V alloy, Thermocalc software, Magnetic material, Phase transformation, Electron backscatter diffraction (EBSD)

Saeed Hasani, Ali Shafyei, Morteza Shamanian, Peiman Behjati, Hossein Mostaan, Timu Juuti, Jerzy A. Szpunar. Correlation Between Magnetic Properties and Allotropic Phase Transition of Fe-Co-V Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(8): 1055-1058.

Figures/Tables 4

Fig. 1 EBSD micrographs of the as-cast specimen: a complete microstructure, b α phase areas, c γ phase areas

Fig. 2 XRD patterns of the as-cast specimen a cold-rolled sheet b

Fig. 3 a Trend of change in B s values of the annealed specimens versus annealing temperature, b XRD patterns of the annealed specimens

Fig. 4 Equilibrium calculations of α, γ and liquid phases for Fe-Co-V alloys with 0 wt% a, 2 wt% b, 4 wt% c, 7 wt% d, 11 wt% e 14 wt% f V as a function of temperature

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