Affiliation:
1. Universidade Federal Fluminense
2. Federal Fluminense University
Abstract
In Nd2Fe14B sintered magnets there is increase of coercivity after Dy diffusion in the region near the surface of the grains. A kinetical model evaluating the Dy surface diffusion is presented. This model is based on a shell hypothesis: the most relevant place for the nucleation is a tiny shell near the grain boundaries. The kinetical analysis shows that a heat treatment during 1 hour at 850°C is able to produce a Dy-rich layer on the surface of the Nd2Fe14B grains.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Reference21 articles.
1. G. Yan, P.J. McGuiness, J.P.G. Farr and I.R. Harris: J. Alloys Compd. Vol. 491(2010), p. L20.
2. H Sepehri-Amin, T. Ohkubo and K. Hono: Journal of Applied Physics Vol. 107 (2010), p. 09A745.
3. S. Sugimoto: J. Phys. D: Appl. Phys. Vol. 44 (2011), p.064001.
4. D.S. Li, M. Nishimoto, S. Suzuki, K. Nishiyama, M. Itoh and K. Machida IOP Conf. Series: Materials Science and Engineering Vol 1 (2009), p.012020.
5. H. Nakamura, K. Hirota, T. Ohashi, T. Minowa: J. Phys. D: Appl. Phys. Vol. 44 (2011), p.064003.
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