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http://140.128.103.80:8080/handle/310901/24779
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| Title: | A study on the phase evolution and magnetic properties of Nd 9.5-1.5xFebal.Ti2.5Zr0.5B 15 + 2x (x = 0-4) bulk magnets |
| Authors: | Chang, H.W.;Hsiao, T.H.;Hsieh, C.C.;Shih, C.W.;Chang, W.C.;Shaw, C.C. |
| Contributors: | Department of Applied Physics, Tunghai University |
| Keywords: | 75.50. Vv;75.50. Ww;Cast magnets;Magnetic properties. 74.25.Ha;Rare earth magnets |
| Date: | 2013 |
| Issue Date: | 2014-05-30T02:25:42Z (UTC)
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| Abstract: | Phase evolution, microstructure, and magnetic properties of Nd 9.5 - 1.5xFebal.Ti2.5Zr0.5B 15 + 2x (x = 0-4) rod magnets with a diameter of 0.9 mm have been investigated. For the as-cast magnets, large amount of 2:14:1 phase exists for x = 0, while an additional amorphous phase appears for x = 1-2, yet large amount of orthorhombic Fe3 B (o-Fe3B) phase is easily formed together with slight 2:14:1 and amorphous phases for x = 3-4. The appearance of amorphous phase with x = 1-2 results in the reduction of permanent magnetic properties drastically, which implies that annealing is necessary to improve the hard magnetic properties of these rod magnets. After annealing the magnets with x = 1-2, the amorphous phase is crystallized into 2:14:1 and Fe3 B phases, as a result, the magnetic properties were improved from Br = 4.7-5.2 kG,i Hc = 2.7-10.9 kOe, and (BH)max =1.1-3.7 MGOe for the as-cast magnets to Br =5.7-6.8 kG,i Hc =6.2-7.4 kOe, and (BH)max = 5.5-5.6 MGOe. For the magnets with x = 3 and 4, annealing treatment is not necessary due to the existence of large amount of orthorhombic Fe3 B (o-Fe3B) in the as-cast state, consequently, exhibit extremely low permanent magnetic properties. ? 1965-2012 IEEE. |
| Relation: | IEEE Transactions on Magnetics,Vol.49,Issue7,P.3364-3367 |
| Appears in Collections: | [應用物理學系所] 期刊論文
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