Study on crystallization behavior and microstructure of melt-spun Nd2(Fe,Nb)14B/α-Fe alloys

• Published in: Journal of materials science Vol. 45; no. 20; pp. 5637 - 5641
• Main Authors: Wang, C., Lan, M. Y., Yan, M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-10-2010; Springer Nature B.V
• Subjects: Alloys; Annealing; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Coercivity; Crystallization; Crystallography and Scattering Methods; Ferrous alloys; Iron; Magnetic properties; Magnetism; Magnets; Materials Science; Melt spinning; Microstructure; Nanocomposites; Nanostructure; Niobium; Niobium base alloys; Polymer Sciences; Solid Mechanics; Thermal stability; Amorphous Phase; Crystallization Behavior; Select Area Electron Diffraction Pattern; Roll Speed; Optimal Annealing Temperature
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-010-4628-8

The effects of Nb addition on the crystallization behavior, microstructure, and magnetic properties of melt-spun Nd
2
Fe
14
B/α-Fe nanocomposite magnets have been studied. The addition of Nb can significantly improve the thermal stability of amorphous phase in as-spun alloys, narrow the range between the onset crystallization temperature and the optimal annealing temperature, restrain the initial formation and growth of α-Fe and Nd
2
Fe
14
B. A finer and more homogeneous microstructure can be obtained in the Nb-doped alloy than in the Nb-free alloy. And the Nb addition makes the grains more equiaxed shape. The Nd
10
Fe
83
Nb
1
B
6
alloy annealed at 715 °C for 10 min exhibits the improved magnetic properties,
B
r
 = 0.90 T,
i
H
c
 = 750 kA/m, (BH)
max
 = 120 kJ/m
3
, the intrinsic coercivity and the maximum energy product increase by 25% and 14%, compared with the Nd
10
Fe
84
B
6
alloy.