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Effect of yttrium addition on the glass forming ability of Co-based alloys

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 6

Abstract

Cobalt-based amorphous alloy ribbons were prepared by means of melt-spinning. The effect of addition of a rare earth element yttrium on the glass forming ability (GFA) and thermal stability were investigated by X-ray diffraction analysis and differential scanning calorimetry. The results show that a small amount of yttrium is effective in improving the glass forming ability and thermal stability of a Co – Fe – Zr – Nb – B alloy. As-quenched glassy ribbon containing 4 at.% yttrium shows the highest GFA and thermal stability. The glass transition temperature Tg, reduced glass transition temperature Trg, supercooled liquid region ΔTx, GFA parameter γ and Vickers hardness are 886 K, 0.618, 96 K, 0.423 and 1158 respectively. Crystallization kinetic studies show that the crystallization activation energies for (Co45Fe21Zr4Nb10B20)96Y4 glassy ribbon are as high as 826 kJ mol− 1 for the first crystallization peak. The excellent GFA and thermal stability of Y-containing alloy is mainly attributed to the scavenging of oxygen and large mismatch in atomic size induced by the addition of yttrium.

Keywords: Co-based amorphous alloy; Glass forming ability; Thermal stability; Rare earth element; Crystallization
* Correspondence address, Yong Liu, Professor State Key Laboratory of Powder Metallurgy Central South University Changsha 410083, Hunan P.R. China. Tel.: +86-731-8830406 Fax: +86-731-8710855 E-mail:

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Received: 2007-12-14
Accepted: 2008-3-29
Published Online: 2013-06-11
Published in Print: 2008-06-01

© 2008, Carl Hanser Verlag, München

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  4. 1st Sino-German Symposium on Computational Thermodynamics and Kinetics and their Applications to Solidification
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  17. Experimental and theoretical study of the phase relations in the zinc-rich corner of the Zn–Fe–Cr system at 450°C
  18. Formation of primary TiN precipitates during solidification of microalloyed steels – Scheil versus DICTRA simulations
  19. ThermoCalc-based numerical computations for temperature, fraction of solid phase and composition couplings in alloy solidification
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https://doi.org/10.3139/146.101676
Keywords for this article
Co-based amorphous alloy; Glass forming ability; Thermal stability; Rare earth element; Crystallization

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. 1st Sino-German Symposium on Computational Thermodynamics and Kinetics and their Applications to Solidification
  5. Basic
  6. First-principles calculations of the thermodynamic and elastic properties of the L12-based Al3RE (RE = Sc, Y, La–Lu)
  7. From binary assessments to thermodynamic databases
  8. Construction of the Al–Ni–Si phase diagram over the whole composition and temperature ranges: thermodynamic modeling supported by key experiments and first-principles calculations
  9. Modeling rapid liquid/solid and solid/liquid phase transformations in Al alloys
  10. Multiphase/multicomponent modeling of solidification processes: coupling solidification kinetics with thermodynamics
  11. Molecular dynamics study of the hcp–bcc phase transformation in nanocrystalline zirconium
  12. Thermodynamic description of multi-component multi-phase alloys and its application to the solidification process
  13. Applied
  14. Phase-diagram-related problems in thermoelectric materials: Skutterudites as an example
  15. Phase equilibria of the Al–Ni–Zn system at 340°C
  16. Thermodynamic description of the Ce-Mg-Y and Mg-Nd-Y systems
  17. Experimental and theoretical study of the phase relations in the zinc-rich corner of the Zn–Fe–Cr system at 450°C
  18. Formation of primary TiN precipitates during solidification of microalloyed steels – Scheil versus DICTRA simulations
  19. ThermoCalc-based numerical computations for temperature, fraction of solid phase and composition couplings in alloy solidification
  20. Effect of yttrium addition on the glass forming ability of Co-based alloys
  21. Phase equilibria in the Y–Ti–Si system at 773 K
  22. DGM News
  23. Personal
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