Modelling the Crystallization Reactions of Amorphous Precursors in Fe3B/Nd2Fe14B Nanocomposite Magnets

Abstract:

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A physically-based model is proposed for the competitive precipitation of multiple phases (bcc-Fe, Fe3B, Nd2Fe14B, Nd2Fe23B3, NdFe4B4 and Fe2B) from an amorphous Fe-B-Nd matrix. These materials form the basis of a class of nanocomposite hard magnets. The nucleation and growth of the different phases are calculated using computational thermodynamics and kinetics tools with input from a thermodynamic assessment of this system. In some alloy compositions, the phase formation sequence during crystallization shows significant sensitivity to the heating-rate. Model calculations illustrate that this effect cannot be explained by homogeneous nucleation and growth of the phases. The possible role of heterogeneous nucleation is briefly discussed.

Info:

Periodical:

Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton

Pages:

1166-1169

DOI:

10.4028/www.scientific.net/MSF.654-656.1166

Citation:

V. Ly et al., "Modelling the Crystallization Reactions of Amorphous Precursors in Fe3B/Nd2Fe14B Nanocomposite Magnets", Materials Science Forum, Vols. 654-656, pp. 1166-1169, 2010

Online since:

June 2010

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$35.00

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