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, P. Jóvári, Kamal Janghorban, Jürgen Eckert

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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
Volume93
DOIs
Publication statusPublished - 2013

Fingerprint

Thermodynamic stability
thermal stability
Soft magnetic materials
Transmission electron microscopy
X ray diffraction
transmission electron microscopy
Metallic glass
metallic glasses
High resolution transmission electron microscopy
Crystallization
Coercive force
magnetic materials
diffraction
Stoichiometry
coercivity
Glass transition
stoichiometry
x rays
Annealing
crystallization

Keywords

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

ASJC Scopus subject areas

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

Cite this

DSC, XRD and TEM characterization of glassy Co40Fe 22Ta8B30 alloy with very high thermal stability. / Taghvaei, Amir Hossein; Stoica, Mihai; Khoshkhoo, Mohsen Samadi; Kaban, Ivan; Bednarčik, Jozef; Jóvári, P.; Janghorban, Kamal; Eckert, Jürgen.

In: Materials Letters, Vol. 93, 2013, p. 322-325.

Research output: Contribution to journalArticle

Taghvaei, AH, Stoica, M, Khoshkhoo, MS, 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, vol. 93, pp. 322-325. https://doi.org/10.1016/j.matlet.2012.11.084
Taghvaei, Amir Hossein ; Stoica, Mihai ; Khoshkhoo, Mohsen Samadi ; Kaban, Ivan ; Bednarčik, Jozef ; Jóvári, P. ; Janghorban, Kamal ; Eckert, Jürgen. / DSC, XRD and TEM characterization of glassy Co40Fe 22Ta8B30 alloy with very high thermal stability. In: Materials Letters. 2013 ; Vol. 93. pp. 322-325.
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AU - Kaban, Ivan

AU - Bednarčik, Jozef

AU - Jóvári, P.

AU - Janghorban, Kamal

AU - Eckert, Jürgen

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