DSC, XRD and TEM characterization of glassy Co40Fe 22Ta8B30 alloy with very high thermal stability

Amir Hossein Taghvaei, Mihai Stoica, Mohsen Samadi Khoshkhoo, Ivan Kaban, Jozef Bednarčik, Pál Jóvári, Kamal Janghorban, Jürgen Eckert

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In this letter we report about a new melt-spun Co40Fe 22Ta8B30 metallic glass with a wide supercooled liquid region of 74 K. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) investigations confirmed that crystallization occurs with significantly longer incubation time during annealing above the glass transition, as compared to the well-known Co43Fe 20Ta5.5B31.5 glassy alloy. The new alloy as a good soft magnetic material showed a very low coercivity of 0.8 A/m and polarization of 0.5 T. The origin of high thermal stability was attributed to the formation of Ta-Ta bonds in the microstructure and the absence or very low quantity of Ta-based units with the composition close to the stoichiometry of the (Co,Fe)21Ta2B6 crystalline phase.

Original languageEnglish
Pages (from-to)322-325
Number of pages4
JournalMaterials Letters
Publication statusPublished - Jan 7 2013


  • CoFeTaB metallic glass
  • Magnetic material
  • Microstructure
  • Thermal stability

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Taghvaei, A. H., Stoica, M., Khoshkhoo, M. S., Kaban, I., Bednarčik, J., Jóvári, P., Janghorban, K., & Eckert, J. (2013). DSC, XRD and TEM characterization of glassy Co40Fe 22Ta8B30 alloy with very high thermal stability. Materials Letters, 93, 322-325. https://doi.org/10.1016/j.matlet.2012.11.084