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Effect of Wheel Speed on the Structure, Microstructure, Magnetic, and Electrical Properties of Tb-Fe-Co Ribbons

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Abstract

Melt spun ribbons of Tb-Fe-Co alloy made with different speeds, viz., 15, 25, 34, and 47 m/s were investigated for structural, microstructural, magnetic, and electrical properties. High cooling rates achieved during melt spinning process were found to significantly affect the microstructure of Tb-Fe-Co ribbons. Structural investigations employing X-ray diffraction and transmission electron microscopy for the Tb-Fe-Co ribbons showed the presence of BCC Fe-Co and amorphous Tb-Fe-Co phases co-existing with the crystalline Tb-Fe-Co phase which has a C15-type cubic Laves structure. In addition, the average grain size of the crystalline Tb-Fe-Co phase is found to decrease with increasing wheel speed during melt spinning. A coercivity value as high as 3.3 kOe was obtained for the melt spun ribbon prepared at 47 m/s wheel speed whereas the as-cast alloy exhibited a coercivity value around 300 Oe. This was attributed to the reduction in the grain size of the crystalline Tb-Fe-Co phase upon melt spinning. Temperature-dependent resistivity measurements indicated that both the as-cast and melt spun ribbons were metallic in nature. The low-temperature resistivity which is dominated by electron-magnon scattering component for the as-cast and melt spun ribbon prepared at 15 m/s was found to show electron-electron scattering as the predominant mechanism with an increase in wheel speed.

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Acknowledgments

The authors gratefully thank DRDO for the financial support.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Hyderabad, India

    K. Umadevi, Mithun Palit, J. Arout Chelvane, D. Arvindha Babu & S. V. Kamat

  2. Department of Physics, National Institute of Technology Warangal, Warangal, India

    K. Umadevi & V. Jayalakshmi

  3. Bhabha Atomic Research Centre, Mumbai, India

    A. P. Srivastava

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  1. K. Umadevi
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  2. Mithun Palit
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  3. J. Arout Chelvane
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  4. D. Arvindha Babu
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  5. A. P. Srivastava
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  6. S. V. Kamat
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  7. V. Jayalakshmi
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Correspondence to J. Arout Chelvane.

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Umadevi, K., Palit, M., Chelvane, J.A. et al. Effect of Wheel Speed on the Structure, Microstructure, Magnetic, and Electrical Properties of Tb-Fe-Co Ribbons. J Supercond Nov Magn 29, 2455–2460 (2016). https://doi.org/10.1007/s10948-016-3559-2

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  • DOI: https://doi.org/10.1007/s10948-016-3559-2

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