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No.4(pp.97-127)

Home > Issues > Volume 9 (2004) > No.4(pp.97-127)

Influence of Roller Speed on Magnetic Properties and Structures of α-Fe/Nd₂Fe₁₄B Nanocomposite Magnets Prepared by Melt-spinning

Journal of Magnetics, Volume 9, Number 4, 31 Dec 2004, Pages 101-104

Wenli Pei*

(School of Materials and Metallurgy, Northeastern University), Fazeng Lian(School of Materials and Metallurgy, Northeastern University), Meng Fu(School of Materials and Metallurgy, Northeastern University), Guiqin Zhou(School of Materials and Metallurgy, Northeastern University), M. Takahashi(Department of Electronic Engineering, Graduate School of Engineering, Tohoku University)

Abstract

The crystallization behaviours of nanocomposite made by a function of quenching rate (roller speed) were studied. The results showed that there was one step crystallization process for the alloy quenched at roller speed of 32 m/s, which could be shown as, Am (amorphouse) + α-Fe+Nd₂Fe₁₄B →α-Fe+Nd₂Fe₁₄B. For the alloy quenched at roller speed of 40 m/s, there was steps crystallization process taking place at different temperatures, which could be shown as, Am → α-Fe+Nd₂Fe₂₃B₃+Nd₂Fe₁₄B+Am'→α-Fe/Nd₂Fe₁₄B. The presence of transition phase (Nd₂Fe₂₃B₃ ) was harmful to get fine and uniform grain size during crystallization process. Uniform microstructures and high magnetic properties could be attained for the as-quenched alloy containing less amorphous phase and no presence of transition phase during annealing treatment. For the alloy prepared at roller speed of 32 m/s, the following properties were obtained, B_r=0.904 T, _iH_c=801kA/m,(BH)_max=122 kj/m³and M_r/M_s= 0.6.

Keywords: Nanocomposite; Melt-spun ribbons; Annealing; Crystallization; Exchange interaction

DOI:

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