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Diffusion Coefficients of Interest for the Simulation of Heat Treatment in Rare-Earth Transition Metal Magnets

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Abstract:

In the case of the modeling of sintering and heat treatments, the diffusion coefficients are an essential input. However, experimental data in the literature about diffusion coefficients for rare-earth transition metal intermetallics is scarce. In this study, the available data concerning diffusion coefficients relevant for rare-earth transition metal magnets are reviewed and commented. Some empirical rules are discussed, for example the activation energy is affected by the size of the diffusing impurity atom. Diffusion coefficients for Dy, Nd and Fe into Nd2Fe14B are given according an Arrhenius equation D=D0 exp (-Q/RT). For Dy diffusion into Nd2Fe14B, Q 315 kJ/mol and D0 8 . 10-4 m2/s.

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Materials Science Forum (Volumes 727-728)

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163-168

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https://doi.org/10.4028/www.scientific.net/MSF.727-728.163

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Online since:

August 2012

Authors:

Marcos Flavio de Campos

Keywords:

Diffusion Coefficient, Heat Treatment, Magnets, Sintering

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