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Impact of different Nd-rich crystal-phases on the coercivity of Nd–Fe–B grain ensembles

Hrkac, G. and Woodcock, T. G. and Butler, K. T. and Saharan, L. and Bryan, M. T. and Schrefl, T. and Gutfleisch, O. (2014):
Impact of different Nd-rich crystal-phases on the coercivity of Nd–Fe–B grain ensembles.
In: Scripta Materialia, Elsevier Science Publishing, pp. 35-38, 70, ISSN 13596462,
[Online-Edition: http://dx.doi.org/10.1016/j.scriptamat.2013.08.029],
[Article]

Abstract

Aberration-corrected transmission electron microscopy, combined with atomistic simulations, has been used to study the anisotropy profiles of interfaces between metallic Nd (fcc, dhcp), Nd2O3 (hP5, cI80), NdO and the Nd2Fe14B phase. The results show that the dhcp Nd and Nd2O3-hP5 phases have a more detrimental effect on coercivity than fcc Nd, Nd2O3-cI80 and NdO. The coercivity change is rooted in distortions in the Nd2Fe14B crystal lattice; the depth and magnitude of this change is a function of orientation and type of Nd-rich phase.

Item Type: Article
Erschienen: 2014
Creators: Hrkac, G. and Woodcock, T. G. and Butler, K. T. and Saharan, L. and Bryan, M. T. and Schrefl, T. and Gutfleisch, O.
Title: Impact of different Nd-rich crystal-phases on the coercivity of Nd–Fe–B grain ensembles
Language: English
Abstract:

Aberration-corrected transmission electron microscopy, combined with atomistic simulations, has been used to study the anisotropy profiles of interfaces between metallic Nd (fcc, dhcp), Nd2O3 (hP5, cI80), NdO and the Nd2Fe14B phase. The results show that the dhcp Nd and Nd2O3-hP5 phases have a more detrimental effect on coercivity than fcc Nd, Nd2O3-cI80 and NdO. The coercivity change is rooted in distortions in the Nd2Fe14B crystal lattice; the depth and magnitude of this change is a function of orientation and type of Nd-rich phase.

Journal or Publication Title: Scripta Materialia
Volume: 70
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Nd–Fe–B, Permanent magnet, Coercivity, Grain boundary, Lattice minimization
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Mar 2014 12:29
Official URL: http://dx.doi.org/10.1016/j.scriptamat.2013.08.029
Identification Number: doi:10.1016/j.scriptamat.2013.08.029
Funders: The authors gratefully acknowledge financial support from the Toyota Motor Corporation.
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