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Updated: Jun 29, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Fe70-Nd7B21Zr2Nb (x = 0-3.0) Permanent Magnets Produced by Crystallizing Amorphous Precursors
Yong Gu1,2, Zili Wang2, Hui Xu3
1School of Engineering & Qianjiang College, Hangzhou Normal University, Hangzhou 310018, China.
Abstract:
The phase evolution, magnetic properties and microstructure of rod-shaped permanent magnets prepared by annealing the amorphous precursor Fe70-Nd7B21Zr2Nb (x = 0-3.0) were systematically studied. X-ray diffraction analysis, magnetometer, microstructure and δM-plots studies show that the good magnetic properties of the magnet are attributed to the uniform microstructure composed of exchange-coupled α-Fe and Nd2Fe14B phases. Nb addition to Fe67.5Nd7B21Zr2Nb2.5 alloy led to an increase in the volume fraction of the soft magnetic phase, reinforced exchange coupling and improved magnetic properties. The magnetic properties of the optimized annealed Fe67.5Nd7B21Zr2Nb2.5 rod are: coercivity (H) = 513.92 kA/m, remanence (B) = 0.58 T, squareness (H) = 0.24 and magnetic energy product ((BH)) = 37.59 kJ/m3.
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