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Phase Formation in Isothermally Annealed (Co0.95Fe0.05)89Zr7B4 Nanocrystalline Alloys

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This report focuses on the phase relations and transformations in a (Fe0.05Co0.95)89Zr7B4 melt-spun alloy with an emphasis on crystallization and its effects on thermomagnetic properties. When as-spun ribbons are annealed at relatively low temperatures (near primary crystallization), the nucleation and growth of nonequilibrium body-centered-cubic (bcc) crystallites occurs in a residual amorphous matrix, as determined by transmission electron microscopy (TEM) and X-ray diffraction (XRD). At intermediate temperatures, bcc crystallites continue to grow with the addition of a small volume fraction of the equilibrium face-centered-cubic (fcc) phase. It is expected that after the bcc nuclei are formed, the grains coarsen as bcc phase and do not transform to the more stable fcc phase at intermediate temperatures. At temperatures where the amorphous matrix phase dissociates into Zr intermetallics, the bcc phase is transformed into fcc and the grains coarsen significantly. Thermodynamic modeling has been used to support the nucleation of the nonequilibrium bcc phase during the early stages of crystallization. Thermomagnetic results show little reduction in the saturation magnetization as a function of annealing temperature up to the primary crystallization temperature (~420 °C).

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Acknowledgments

The authors acknowledge support from the Office of Naval Research. One of the authors (TMH) gratefully acknowledges the support of the National Research Council.

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Authors and Affiliations

  1. Naval Research Laboratory, Washington, DC, 20375, USA

    Matthew A. Willard (Research Metallurgist) & Todd M. Heil (NRC Postdoctoral Associate)

  2. SAIC, Washington, DC, 20003, USA

    Ramasis Goswami (Research Scientist)

Authors
  1. Matthew A. Willard
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  2. Todd M. Heil
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  3. Ramasis Goswami
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Corresponding author

Correspondence to Matthew A. Willard.

Additional information

This article is based on a presentation made in the symposium “Phase Transformations in Magnetic Materials” which occurred during the TMS Spring meeting, March 12–16, 2006, in San Antonio, TX under the auspices of the Joint TMS-MPMD and ASMI-MSCTS Phase Transformations Committee.

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Willard, M.A., Heil, T.M. & Goswami, R. Phase Formation in Isothermally Annealed (Co0.95Fe0.05)89Zr7B4 Nanocrystalline Alloys. Metall Mater Trans A 38, 725–731 (2007). https://doi.org/10.1007/s11661-006-9065-6

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