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Synthesis, structural and magnetic properties of the nanocomposite Fe63B23Nd7Y3Nb3Cr1 magnets |
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| Authors: | Zubair Ahmad Tianyu Ma Shan TaoMi Yan |
| Institution: | a State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China b Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China c Institute of Industrial Control System, P. Box 1398, Rawalpindi, Pakistan |
| Abstract: | The Fe63B23Nd7Y3Nb3Cr1 nanocomposite magnets in the form of sheets have been prepared by copper mold casting technique. The phase evolution, crystal structure, microstructural and magnetic properties have been investigated in the as-cast and annealed states. The as-cast sheets show magnetically soft behaviors which become magnetically hard by thermal annealing. The optimal annealed microstructure was composed of nanosize soft magnetic α-Fe (19-29 nm) and hard magnetic Nd2Fe14B (45-55 nm) grains. The best hard magnetic properties such as intrinsic coercivity, jHc of 1119 kA/m, remanence, Br of 0.44 T, magnetic induction to saturation magnetization ratio, Mr/Ms=0.61 and maximum energy product, (BH)max of 55 kJ/m3 was obtained after annealing at 680 °C for 15 min. The annealing treatment above 680 °C results in non-ideal phase grains growth, which degrade the magnetic properties. |
| Keywords: | Nanocomposite magnets Magnetic properties Thermal annealing Permanent magnetic Fe63B23Nd7Y3Nb3Cr1 alloy |
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