Hostname: page-component-848d4c4894-ttngx Total loading time: 0 Render date: 2024-05-19T13:41:49.629Z Has data issue: false hasContentIssue false
  • English
  • Français

Fe64B22.8Nd6.6Y3.9Nb2.7 bulk nanocomposite magnets with improved size and magnetic properties

Published online by Cambridge University Press:  16 December 2011

Zubair Ahmad ,
Shan Tao ,
Tianyu Ma  and
Mi Yan
Zubair Ahmad
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Shan Tao
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Tianyu Ma
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
Mi Yan*
Affiliation:
State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 312007, China
*
a)Address all correspondence to this author. e-mail: mse_yanmi@zju.edu.cn
Get access

Abstract

The Fe64B22.8Nd6.6Y3.9Nb2.7 nanocomposite permanent magnets in the form of rods of 2 mm in diameter and 25 mm in length have been prepared by annealing the amorphous precursors. The phase evolution, microstructure, and magnetic properties of Fe64B22.8Nd6.6Y3.9Nb2.7 nanocomposite permanent magnets have been investigated by x-ray diffractometry, transmission electron microscopy, and magnetometry techniques. The exchange coupling between the magnetically soft and hard magnetic phase is evidenced by the δM curves. The hard magnetic properties of the nanocomposites were found to be sensitive to the annealing process. The microstructure of the annealed nanocomposite consists of magnetically soft α-Fe (15–25 nm) and Fe3B (25–35 nm) grains and hard magnetic Nd2Fe14B (45–55 nm) grains. The optimum hard magnetic properties, such as jHc = 961.6 kA/m (12.0 kOe), Br = 0.65 T (6.5 kG), and BHmax = 65.17 kJ/m3 (8.19 MGOe), were obtained by annealing the alloy at 700 °C for 15 min and are related to the more refined nanostructure leading to strong exchange coupling between the soft and hard magnetic grains. Annealing above 700 °C induces a decoupling effect due to the coarsening of soft and hard magnetic phases.

Keywords

Magnetic propertiesAmorphousNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 4 , 28 February 2012 , pp. 725 - 729
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Luo, Q. and Wang, W.H.: Rare earth based bulk metallic glasses. J. Non-Cryst. Solids 355, 759 (2009).CrossRefGoogle Scholar
2.Liu, Z.W., Liu, Y., Deheri, P.K., Ramanujan, R.V., and Davies, H.A.: Improving permanent magnetic properties of rapidly solidified nanophase RE-TM-B alloys by compositional modification. J. Magn. Magn. Mater. 321, 2290 (2009).Google Scholar
3.Chang, H.W., Cheng, Y.T., Hsieh, C.C., Chang, W.C., and Sun, A.C.: Composition dependence of magnetic properties of directly quenched Nd–Fe–Ti–Zr–B bulk magnets. J. Alloys Compd. 509, 1249 (2011).CrossRefGoogle Scholar
4.Jian, H., Luo, W., Tao, S., and Yan, M.: Mechanical and magnetic properties of (Fe72Mo4B24)100−xTbx (x=4, 5, 6, 7at.%) bulk glassy alloys. J. Alloys Compd. 505, 315 (2010).CrossRefGoogle Scholar
5.Tao, S., Ma, T., Jian, H., Ahmad, Z., Tong, H., and Yan, M.: Glass forming ability, magnetic and mechanical properties of (Fe72Mo4B24)100-x)Dyx (x=4-7) bulk metallic glasses. Mater. Sci. Eng., A. 528, 161 (2010).Google Scholar
6.Marinescu, M., Chiriac, H., and Grigoras, M.: Magnetic properties of bulk nanocomposite permanent magnets based on NdDyFeB alloys with additions. J. Magn. Magn. Mater. 290–291, 1267 (2005).Google Scholar
7.Chang, H.W., Shih, M.F., Hsieh, C.C., Chang, W.C., and Shen, C.Y.: Epoxy resin effect on anisotropic Nd–Fe–B rubber-bonded magnet. J. Alloys Compd. 489, 499 (2010).Google Scholar
8.Zhang, J., Lim, K.Y., Feng, Y.P., and Li, Y.: Fe–Nd–B based hard magnets from bulk amorphous precursor. Scr. Mater. 56, 943 (2007).Google Scholar
9.Zhian, C., Ji, L., Yanli, S., and Zhimeng, G.: Effect of yttrium substitution on magnetic properties and microstructure of Nd–Y–Fe–B nanocomposite magnets. J. Rare Earths 28, 277 (2010).Google Scholar
10.Tan, X.H., Xu, H., Bai, Q., Zhao, W.J., and Dong, Y.D.: Glass forming ability of Fe–Co–Nd–Zr–Fe–B permanent magnets derived from amorphous precursor. Appl. Phys. Lett. 91, 252501 (2007).CrossRefGoogle Scholar
11.Tao, S., Ahmad, Z., Jian, H., Ma, T.Y., and Yan, M.: Synthesis, thermal stability and properties of [Fe 1-x Cox)72Mo4B24]94Dy6 bulk metallic glasses. J. Alloys Compd. 509, 3843 (2011).Google Scholar
12.Takeuchi, A. and Inoue, A.: Classification of bulk metallic glasses by atomic size difference, heat of mixing and period of constituent elements and its application to characterization of the main alloying element. Mater. Trans. JIM 46, 2817 (2005).CrossRefGoogle Scholar
13.Hanawalt, D., Rinn, H.W., and Frevel, L.K.: Chemical analysis by x-ray diffraction, classification and use of x-ray diffraction patterns. Ind. Eng. Chem. Anal. Ed. 10, 457 (1938).Google Scholar
14.Scherrer, P.: Bestimmung der Grösse und der inneren Struktur von Kolloidteilchen mittels Röntgenstrahlen. Gottinger Nachr. 26, 98 (1918).Google Scholar
15.Shen, T.D. and Schwarz, R.B.: Bulk ferromagnetic glasses prepared by flux melting and water quenching. Appl. Phys. Lett. 75, 5 (1999).CrossRefGoogle Scholar
16.Inoue, A.: High strength bulk amorphous alloys with low critical cooling rates. Mater. Trans. JIM 36, 866 (1995).Google Scholar
17.Ponnambalam, V., Poon, S.J., Shiflet, G.J., Keppens, V.M., Taylor, R., and Petculescu, G.: Synthesis of iron-based bulk metallic glasses as nonferromagnetic amorphous steel alloys. Appl. Phys. Lett. 83, 1131 (2003).CrossRefGoogle Scholar
18.Chang, W.C., Chiou, D.Y., Ma, B.M., and Bounds, C.O.: High performance α-Fe/ R2 Fe14B type nanocomposites with nominal compositions of (Nd, La)9.5 Fe 78-xCoxCr2B10.5 (x=0-10). J. Magn. Magn. Mater. 189, 55 (1998).Google Scholar
19.Chang, H.W., Shih, M.F., Chang, C.W., Hsieh, C.C., Cheng, Y.T., Chang, W.C., Sun, A.C., and Yao, Y.D.: Magnetic properties, phase evolution and microstructure of directly quenched bulk Pr–Fe–B–Nb magnets. Scr. Mater. 59, 227 (2008).CrossRefGoogle Scholar
20.Fischer, R. and Kronmuller, H.: Importance of ideal grain boundaries of high remanent composite permanent magnets. J. Appl. Phys. 83, 3271 (1998).Google Scholar
21.Chen, Z.M., Zhang, Y., Ding, Y.Q., Hadjipanayis, G.C., Chen, Q., and Ma, B.M.: Studies on magnetic properties and microstructure of melt-spun nanocomposite R8(Fe, Co, Nb)86B6 (R=Nd, Pr) magnets. J. Magn. Magn. Mater. 195, 420 (1999).Google Scholar
22.Parhofer, S.M., Wecker, J., Kuhrt, C., Gieres, G., and Schultz, L.: Remanence enhancement due to exchange coupling in multi layers of hard- and soft magnetic phases. IEEE Trans. Magn. 32, 4437 (1996).CrossRefGoogle Scholar