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Probing Phase Evolution Behavior during Nanocrystallization of Metallic Glass Using Positron Annihilation Spectroscopy

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Abstract

Positron annihilation lifetime spectroscopy and coincidence Doppler broadening (CDB) techniques have been used to study the nanocrystallization behavior of soft magnetic materials, using Metglas 2826MB as an example. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterization techniques revealed the presence of two phases, γ-(Fe,Ni) and (Fe,Ni,Mo)23B6, as well as the size and volume fraction of the phases following predetermined thermal annealing. Two distinct positron lifetime components have been observed in both amorphous and nanocrystallized samples. In the nanocrystallized samples, it has been demonstrated unambiguously that small and large lifetime components were due to positron annihilation with crystalline nanophases and with amorphous-crystalline or intercrystalline interfaces, respectively. First-principle calculation of the positron lifetime and electron momentum distribution in crystalline phases, supplemented by TEM and XRD studies, helped in the unambiguous interpretation of the experimental observation. This study throws new insights into positron behavior in metallic glasses, especially in the presence of single or multiple nanophases embedded in the amorphous matrix.

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Notes

  1. FINEMET is a registered trademark of Hitachi Metals, Ltd., Arlington Heights, IL.

  2. NANOPERM is a registered trademark of MAGNETEC GmbH, Langenselbold, Germany.

  3. PHILIPS is a trademark of Philips Electronic Instruments Corp., Mahwah, NJ.

  4. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Authors and Affiliations

  1. Materials Science Division, Bhabha Atomic Research Center, Mumbai, 400 094, India

    A. P. Srivastava (Scientific Officer (D), D. Srivastava (Scientific Officer (H) & G. K. Dey (Head)

  2. Radiochemistry Division, Bhabha Atomic Research Center, Mumbai, 400 094, India

    K. Sudarshan (Scientific Officer (E) & P. K. Pujari (Scientific Officer (H)

Authors
  1. A. P. Srivastava
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  2. D. Srivastava
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  3. G. K. Dey
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  4. K. Sudarshan
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  5. P. K. Pujari
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Correspondence to A. P. Srivastava.

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Manuscript submitted February 21, 2008.

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Srivastava, A.P., Srivastava, D., Dey, G.K. et al. Probing Phase Evolution Behavior during Nanocrystallization of Metallic Glass Using Positron Annihilation Spectroscopy. Metall Mater Trans A 40, 1757–1766 (2009). https://doi.org/10.1007/s11661-009-9832-2

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  • DOI: https://doi.org/10.1007/s11661-009-9832-2

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