Welcome to Open Science
Contact Us
Home Books Journals Submission Open Science Join Us News
Enhancement of Coercivity and Maximum Energy Product of Annealed Nd-Fe-B Nanocomposite Alloys
Current Issue
Volume 5, 2018
Issue 4 (August)
Pages: 72-77   |   Vol. 5, No. 4, August 2018   |   Follow on         
Paper in PDF Downloads: 23   Since Sep. 1, 2018 Views: 988   Since Sep. 1, 2018
Palash Chandra Karmaker, Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh; Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh; Department of EEE, University of Information Technology & Sciences, Dhaka, Bangladesh.
Mohammad Obaidur Rahman, Department of Physics, Jahangirnagar University, Savar, Dhaka, Bangladesh.
Nguyen Huy Dan, Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
Samia Islam Liba, Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh.
Per Nordblad, Solid State Physics, Department of Engineering Science, Uppsala University, Uppsala, Sweden.
Sheikh Manjura Hoque, Materials Science Division, Atomic Energy Center, Dhaka, Bangladesh.
Nanocomposite Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x=0 and 1) ribbons were prepared by melt spinning technique with constant wheel speed of 40 m/s. The samples have been annealed in an evacuated quartz tube using a pressure of around 10-5 mbar for 10 minutes at different crystallization temperatures like 675°C, 687°C, 700°C, 712°C and 725°C which are found by differential scanning calorimetry (DSC). Crystallization behavior was studied by X-ray diffraction (XRD) using CuKα radiation (1.5418Å). The ribbon samples were also characterized by vibrating sample magnetometer (VSM). Highest value of Hc has been obtained as 1.06 kOe for the sample of composition Nd4-xTbxFe83.5Co5Cu0.5Nb1B6 (x=0) annealed at 700°C for 10 min. At 700°C maximum energy product (BH)max and remanent ratio (Mr/Ms) have been found to be 2.55 MGOe and 0.61 respectively. Higher Tb substitution has significantly reduced the value of coercivity (Hc) and maximum energy product (BH)max. The M-H hysteresis loops show extremely soft natures which do not possess any area. However, with the annealing of the samples in the above mentioned temperature evolution of large coercivity was observed due to the formation of exchange couple hard and soft nanocrystal composites.
Nanocomposite, Soft and Hard Phase, Coercivity, Maximum Energy Product, Remanent Ratio, Crystallization Temperature
Yamasaki, M., Hamano, M. and Kobayashi, T. (2002). Mössbauer Study on the Crystallization Process of α-Fe/Nd2Fe14B type Nanocomposite Magnet Alloy. Materials Transactions, vol. 43, pp. 2885-2889.
Kneller, E. F. and Hawig, R. (1991). The Exchange-Spring Magnet: A New material principle for permanent magnets. IEEE Transactions on Magnetics, vol. 27, pp. 3588-3599.
Girt, E., Krishnan, K. M., Thomas, G., Girt, E. and Altouniam, Z. (2001). Coercivity limits and mechanism in nanocomposite Nd-Fe-B alloys. Journal of Magnetism and Magnetic Materials, vol. 231, pp. 219-230.
Withanawasam, L., Murphy, A. S., Hadjipanayis, G. C. and Krause, R. F. (1994). Nanocomposite R2Fe14B/Fe exchange coupled magnets. Journal of Applied Physics, vol. 76, pp. 7065-7067.
Hoque, S. M., Hakim, M., Khan, F. A. and Dan, N. H. (2007). Effect of Tb substitution on the magnetic properties of exchange-biased Nd2Fe14B/Fe3B. Journal of Materials Science, vol. 42, pp. 9415-9420.
Sepehri-Amin, H., Liu, J., Ohkubo, T., Hioki, K., Hattori, A. and Hono, K. (2013). Enhancement of coercivity of hot-deformed Nd–Fe–B anisotropic magnet by low-temperature grain boundary diffusion of Nd60Dy20Cu20 eutectic alloy. Scripta Materialia, vol. 69, pp. 647-650.
Sun, J. B., Bu, S. J., Cui, C. X., Ding, H. W., He, C. H., Zhang, L. and Han, X. W. (2013). A new Sm–Co-type hard magnetic alloy with anamorphous based nanocrystalline microstructure. Intermetallics, vol. 35, pp. 82-89.
Hasiak, M., Miglierini, M., Yamashiro, M. Y., Ciurzynska, W. H., Yanai, T. and Fukunaga, H. (2003). Microstructure and Magnetic properties of nanocrystalline Fe-Zr-TM-B-Cu (TM=Nb or Mn) alloys. Journal of Magnetism and Magnetic Materials, vol. 254, pp. 457-459.
Lou, L., Hou, F. C., Wang, Y. N., Cheng, Y., Li, H. L., Li, W., Guo, D. F., Li, X. H. and Zhang, X. Y. (2014). Texturing for bulk alpha-Fe/Nd2Fe14B nocomposites with enhanced magnetic properties. Journal of Magnetism and Magnetic Materials, vol. 352, pp. 45-48.
Zhou, C. and Pinkerton, F. E. (2014). Magnetic hardening of CeFe12-xMox and the effect of nitrogenation. Journal of Alloys and Compound, vol. 583, pp. 345-350.
Pengyue, Z., Minxiang, P., Hongliang, G., Ming, Y. and Weiqiang, L. (2013). Study on magnetization reversal behavior for annealed Nd2Fe14B/α-Fe nancomposite alloys. Journal of Rare Earths, vol. 31, pp. 759-764.
Sabbaghizadeh, R. and Hashim, M. (2013). Effects of heat treatment on the magnetic properties of melt-spun Nd6Pr1Fe76B12Ti4C1Co3 nanocomposite ribbons. Electronic Materials Letters, vol. 9, pp. 115-118.
Tang. X., Chen, R., Li, M., Jin, C., Yin, W., Don Lee, D. and Yan, A. (2018). Grain boundary diffusion behaviors in hot-deformed Nd2Fe14B magnets by PrNd-Cu low eutectic alloys. Journal of Magnetism and Magnetic Materials, vol. 445, pp. 66–70.
Grigoras, M., Lostun, M., Urse, M., Borza, F., Chiriac, H. and Lupu, N. (2018). Nd-Fe-B/Sm-M/Nd-M (M=Fe, Co, Ti, Cu, Zr) hybrid magnets with improved thermal stability. Journal of Magnetism and Magnetic Materials, vol. 447, pp. 68-72.
Imaoka, N., Kakimoto, E., Takagi, K., Ozaki, K. Tada, M., Nakagawa, T. and Abe, M. (2016). Exchange coupling between soft magnetic ferrite and hard ferromagnetic Sm2Fe17N3 in ferrite/Sm2Fe17N3 composites. AIP Advances, vol. 6, pp. 056022.
Saito, T., Nozaki, S. and Nishio-Hamane, D. (2018). Improvement of coercivity in Nd-Fe-B nanocomposite magnets. Journal of Magnetism and Magnetic Materials, vol. 445, pp. 49–52.
Yang, F., Sui, Y., Chen, C., Ye, S., Li, P., Guo, Z., Paley, V. and Volinsky, A. A. (2018). Sulfur doping effect on microstructure and magnetic properties of Nd-Fe-B sintered magnets. Journal of Magnetism and Magnetic Materials. vol. 446, pp. 214-220.
Zhou, Q., Zhang, J. S., Jiao, D. L., Z. W. and Grenechec, J. M. (2017). A nanocomposite structure in directly cast NdFeB based alloy with low Nd content for potential anisotropic permanent magnets. Materials & Design, vol. 117, pp. 326-331.
Xie, J., Yuan, C., Luo, Y., Yang, Y., Hu, B., Yu, D., and Yan, W. (2018). Coercivity enhancement and thermal-stability improvement in the melt-spun NdFeB ribbons by grain boundary diffusion. Journal of Magnetism and Magnetic Materials, vol. 446, pp. 210-213.
Yang, Y., Walton, A., Sheridan, R., Güth, K., Gau, R., Gutfleisch, O., Buchert, M., Steenari, M. B., Gerven, T. V., Jones, P. T. and Binnemans, K. (2017). REE Recovery from End-of-Life NdFeB Permanent Magnet Scrap: A Critical Review. Journal of Sustainable Metallurgy, vol. 3, pp. 122–149.
Open Science Scholarly Journals
Open Science is a peer-reviewed platform, the journals of which cover a wide range of academic disciplines and serve the world's research and scholarly communities. Upon acceptance, Open Science Journals will be immediately and permanently free for everyone to read and download.
Office Address:
228 Park Ave., S#45956, New York, NY 10003
Phone: +(001)(347)535 0661
Copyright © 2013-, Open Science Publishers - All Rights Reserved