Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase |
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| Affiliation: | 1. Institution of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China;2. State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;1. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;2. Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;3. Dpto. Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, P.O. Box 1065, 41080 Sevilla, Spain |
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| Abstract: | The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe93-xNb2(Nd,Pr)2B2 (x = 5–7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe93-x-yCoxNb2(Nd,Pr)yB5 (x = 0–20 and y = 5–7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr2(Fe,Co)14B with grain sizes of 10–50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)max values after annealing at an optimum temperature are improved by addition of 5–20 at. % Co for the Fe86-xCoxNb2(Nd,Pr)7B5 and Fe88-xCoxNb2Nd5B5 alloys. The improvement of (BH)max by Co addition is attributed to the enhancement of Jr, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases. |
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