Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (5): 321-326.DOI: 10.11890/1006-7191-105-321

• 研究论文 •    下一篇

B effects on Crystallization and Magnetic properties of Pr9.4Fe90.6-xBx (x = 7.16, 4.76) nanocomposite magnets

游才印   

  1. 西安理工大学
  • 收稿日期:2010-02-26 修回日期:2010-04-22 出版日期:2010-10-25 发布日期:2010-10-14
  • 通讯作者: 游才印

B effects on crystallization and magnetic properties of Pr9.44Fe90.56-xBx (x=7.16, 4.76) nanocomposite magnets

Caiyin YOU, Na TIAN, Zhengxin LU, Liling GE, Xiaotian JING   

  1. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
  • Received:2010-02-26 Revised:2010-04-22 Online:2010-10-25 Published:2010-10-14
  • Contact: Caiyin YOU

PDF (PC)

999

摘要： Magnetic properties, phase evolution and microstructures of Pr9.44Fe90.56-xBx (x = 7.16, 4.76) nanocomposite magnets have been investigated. Both as-spun ribbons exhibit two-step demagnetization curves, indicating the feature of partial crystallization. By using differential scanning calorimeter (DSC) measurements, remaining amorphous phase of ribbon with B = 7.16 shows a higher crystallization temperature. At optimum annealing temperature of 650oC for 10 min, better magnetic properties, Mr = 1.01 T, jHc = 796 kA/m and (BH)max = 136 kJ/m3 were obtained in the sample with B = 4.76. Transmission electron microscopy (TEM) observation confirms that sample with B = 4.76 consists of much finer grain size, which causing a better exchange coupling between soft and hard magnetic grains.

关键词: nanocomposite magnet, melt spinning, exchange coupling, microstructure

Abstract: Magnetic properties, phase evolution and microstructures of Pr9.44Fe90.56-xBx (x=7.16 and 4.76) nanocomposite magnets have been investigated. Both as-spun ribbons exhibit two-step demagnetization curves, indicating the feature of partial crystallization. By using differential scanning calorimeter (DSC) measurements, remained amorphous phase of ribbon with x=7.16 shows a higher crystallization temperature. At optimum annealing temperature of 650 ℃ for 10 min, better magnetic properties, Mr=1.01 T, jHc=796 kA/m and (BH)max=136 kJ/m3 were obtained in the sample with x=4.76. Transmission electron microscopy (TEM) observation confirms that the sample with x=4.76 possesses much finer grain size, which causing a better exchange coupling between soft and hard magnetic grains.

Key words: Nanocomposite magnet, Melt spinning, Exchange coupling, Microstructure