NDLI: Crystallization kinetics of amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ and preparation of α-Fe/Nd$_{2}$Fe$_{14}$B nanocomposite magnets by controlled melt-solidification technique

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Crystallization kinetics of amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ and preparation of α-Fe/Nd$_{2}$Fe$_{14}$B nanocomposite magnets by controlled melt-solidification technique

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Crystallization kinetics of amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ and preparation of α-Fe/Nd$_{2}$Fe$_{14}$B nanocomposite magnets by controlled melt-solidification technique

Content Provider	Springer Nature Link
Author	Yang, Li Shang, Yong
Copyright Year	2003
Abstract	The crystallization kinetics of amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ and the preparation of α-Fe/Nd$_{2}$Fe$_{14}$ B nanocomposite magnets by controlled melt-solidification of Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ was investigated by employing DTA, XRD, and TEM. The results show that a metastable intermediate phase Nd$_{8}$Fe$_{27}$B$_{24}$ prior to α-Fe and Nd$_{2}$Fe$_{14}$B phases is crystallized as the amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ is heated to 1 223 K. The crystallization activation energy of α-Fe and Nd$_{8}$Fe$_{27}$B$_{24}$ phases is larger at the beginning stage of crystallization, and then it decreases with crystallized fraction x for the former and has little change when x is below 70% for the latter, which essentially results in an α-Fe/Nd$_{2}$Fe$_{14}$B microstructure with a relatively coarse grain size about 20–60 nm and a non-uniform distribution of grain size in the annealed alloy. The α-Fe/Nd$_{2}$Fe$_{14}$B nanocomposite magnets with a small average grain size about 14 nm and a quite uniform grain size distribution were prepared by controlled melt-solidification of Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ at a wheel speed of 20 m · s$^{−1}$ during melt-spinning. The magnets show a high maximum energy product of (BH)max=194 kJ · m$^{−3}$, which is nearly twice of that of the nanocomposite magnets made by annealing the amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ precursor alloy.
Starting Page	280
Ending Page	286
Page Count	7
File Format	PDF
ISSN	10059784
Journal	Journal of Central South University of Technology
Volume Number	10
Issue Number	4
e-ISSN	19930666
Language	English
Publisher	Central South University of Technology
Publisher Date	2003-01-01
Publisher Place	Changsha
Access Restriction	Subscribed
Subject Keyword	nanocomposite magnet nanocrystalline alloy amorphous alloy Engineering Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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Crystallization kinetics of amorphous Nd$_{3.6}$Pr$_{5.4}$Fe$_{83}$Co$_{3}$B$_{5}$ and preparation of α-Fe/Nd$_{2}$Fe$_{14}$B nanocomposite magnets by controlled melt-solidification technique

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