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Structure, Properties, and Glass Forming Ability of Melt-Spun Fe-Zr-B-Cu Alloys with Different Zr/B Ratios

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Abstract

Melt-spun ribbons of Fe99–x–y Zr x B y Cu1 alloys with x + y = 11 and x + y = 13 were prepared under similar experimental conditions and characterized for structure and soft magnetic properties. Substitution of Zr by B changes the structure of as-spun ribbons from completely amorphous to cellular bcc solid solution coexisting with the amorphous phase at intercellular regions and then to completely dendritic solid solution. The glass forming ability (GFA) of the Fe-Zr-B-Cu system, evaluated from thermodynamic properties such as enthalpy of mixing and mismatch entropy, is found to be in good agreement with the experimental observations. Annealing of all ribbons leads to the precipitation of nanocrystalline bcc α-Fe phase from both amorphous phase and already existing bcc solid solution. A window of alloy compositions that exhibit the best combination of soft magnetic properties (high saturation magnetization and low coercivity) was identified.

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Acknowledgments

This work was supported by the Defence Research and Development Organization (DRDO), New Delhi, India. The authors thank Dr. A.K. Singh (DMRL) and Dr. Kiran (MIDHANI) for their help with XRD and coercivity measurements. Several of the authors (DAB, BM, and DA) are grateful to Dr. G. Malakondaiah, Director, DMRL, for his continued support and permission to publish this work.

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Authors and Affiliations

  1. Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    D. Arvindha Babu (Scientist ‘C’), B. Majumdar (Scientist ‘E’) & D. Akhtar (Scientist ‘G”)

  2. Materials Science Division, Bhabha Atomic Research Centre, Mumbai, 400094, India

    A. P. Srivastava (Scientific Officer ‘D”) & D. Srivastava (Scientific Officer ‘H”)

  3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    B. Ramakrishna Rao (Scientist ‘D’) & B. S. Murthy (Professor)

  4. Naval Materials Research Laboratory, Thane, 421506, India

    B. Ramakrishna Rao (Scientist ‘D’)

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  1. D. Arvindha Babu
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  2. B. Majumdar
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  3. A. P. Srivastava
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  4. B. Ramakrishna Rao
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  5. D. Srivastava
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  6. B. S. Murthy
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  7. D. Akhtar
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Correspondence to B. Majumdar.

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Manuscript submitted May 31, 2010.

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Arvindha Babu, D., Majumdar, B., Srivastava, A.P. et al. Structure, Properties, and Glass Forming Ability of Melt-Spun Fe-Zr-B-Cu Alloys with Different Zr/B Ratios. Metall Mater Trans A 42, 508–516 (2011). https://doi.org/10.1007/s11661-010-0446-5

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  • DOI: https://doi.org/10.1007/s11661-010-0446-5

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