발간논문

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Vol.13, No.3, 267 ~ 274, 1975
Title
Studies on the Development of Fe - Cr - Co - R ( R : rare earth metals ) Magnet materials
송진태 Song Jin Tae
Abstract
Magnetic and mechanical properties of Fe-Cr-Co-R (R: rare earth metals Y and Sm) magnet alloys were studied and the mechanism bringing about their characteristics is closely examined through the heat treatment. A number of Fe-30%Cr-25%Co-(1∼2)%R quaternary alloys for specimens were prepared by arc melting under a protective atmosphere and specimens were annealed for various times at the aging temperatures between 100℃ and 800℃. It was found that the magnetic and mechanical properties of Fe-Cr-Co-R quaternary alloys annealed between 500℃ and 600℃ were the best and superior to Fe-Cr-Co ternary alloys. Especially, the coercive force of Fe-30%Cr-25%Cr-2% Sm was remarkable compared to Fe-Cr-Co magnet alloys and the maximum energy product 3.3 MGOe was obtained at the state annealed at 580℃ and for 16hrs. Temperature difference between the peak of coercive force and hardness of alloys was almost nothing, which was less than the temperature difference in many precipitated magnetic materials. It may be concluded that the significant increment of coercive force and tensile strength between aging temperatures 500℃ and 600℃ of these alloys is due to the modulated structure of fine (Fe-Co-R) phases with a high saturation magnetization and non-ferromagnetic Cr rich phase produced by the spinodal decomposition.
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