99 Texture development in Nd-Fe-V alloys by hot deformation in view of permanent magnet properties I.Popa 1,2,a , S. Rivoirard 1,b , D. Chateigner 3,c , T. Hansen 4,d , D. Fruchart 2,e 1 CNRS-CRETA, BP 166, 38042 Grenoble cedex 9, France 2 CNRS-Laboratoire de Cristallographie, BP 166, 38042 Grenoble cedex 9, France 3 CRISMAT-ENSICAEN, 6, boulevard du Maréchal Juin, 14 050 Caen, France 4 Institut Laue Langevin, 6 Rue J. Horowitz, BP 156, 38042 Grenoble, cedex 9, France a ioana.popa@esrf.fr, b sophie.rivoirard@grenoble.cnrs.fr, c daniel.chateigner@ismra.fr, d hansen@ill.fr, e daniel.fruchart@grenoble.cnrs.fr Keywords: permanent magnet, high-speed hot forging, initial microstructure, intergranular phase content, texture Abstract. In this study, a hot forging process is applied to Nd-Fe-V as cast alloys in order to develop both the microstructure and the crystallographic texture appropriate for permanent magnet properties. A neutron diffraction texture analysis is used to account for the extrinsic magnetic anisotropy: the stabilisation of the Nd(Fe,V) 12 hard magnetic phase has been achieved during forging but its extrinsic anisotropy level remains low. Attempts to understand this phenomenon are made through a discussion on the Nd-Fe-V alloy rheological and mechanical behaviour and a comparison with Nd-Fe-B permanent magnets. Introduction Good levels of coercivity and enhanced magnetic anisotropy are the key for high performance magnets. In the field of rare earth - transition metal alloys, the development of anisotropic powders is needed for bonded magnet applications. Anisotropic Nd-Fe-B based alloys are already commercially available whereas, only recently some studies report on Nd-Fe-V-N alloys with potential permanent magnet properties. The NdFe 10.5 V 1.5 compounds, one of the 1:12 phases RFe 12-X M X (R = rare earth, M = transition metal), can be considered as potential materials for permanent bonded magnets because of their high intrinsic magnetic properties, higher than those of the Nd 2 Fe 14 B-type materials [1], which are presently the most used as permanent magnets. For this purpose, good extrinsic magnetic properties are also needed: coercivity, and extrinsic magnetic anisotropy. Up to now, mechanical alloying enabled to obtain a high coercivity in this type of materials (H c = 872.17 kA/m) [2]. Materials Science Forum Vols. 495-497 (2005) pp. 1389-1394 online at http://www.scientific.net © 2005 Trans Tech Publications, Switzerland Licensed to Daniel Chateigner (daniel.chateigner@ismra.fr) - ISMRA - France All rights reserved. No part of the contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of the publisher: Trans Tech Publications Ltd, Switzerland, www.ttp.net . (ID: 195.83.126.10-28/04/05,14:14:49)