Abstract
The oxidation characteristics of the Co-rich amorphous magnetic alloy, \({\text{Co}}_{75.26 - x} {\text{Fe}}_{{\text{4}}{\text{.74}}} \left( {{\text{BSi}}} \right)_{20 + x}\) were investigated. A TEM study of the microstructure revealed a complex oxidation behavior of the alloy depending on composition, especially the boron and silicon concentrations. It was determined that the critical concentration of the metalloid to be 21 at.% above, which a continuous layer of an amorphous borosilicate phase formed on the surface. Phase separation of the surface oxide was also observed when the composition is rich in boron. The metalloid (boron and silicon) concentration was critical in determining the surface-oxide morphology, which in turn, affected the subsurface microstructure. As the magnetization behavior of the Co-rich amorphous alloy depends upon the surface oxide and the internal-oxide precipitates, the guidelines are provided by which one can engineer the microstructure of the alloy to optimize the magnetic properties.
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Kim, C.K., Yoon, C.S., Byun, T.Y. et al. Oxidation of Amorphous Co75.26−xFe4.74(BSi)20+x Magnetic Alloy. Oxidation of Metals 55, 177–187 (2001). https://doi.org/10.1023/A:1010386408279
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DOI: https://doi.org/10.1023/A:1010386408279