Texture Development in Nd-Fe-V and Nd-Fe-B Alloys by Hot Forging in View of Improving Permanent Magnet Properties

Abstract:

A high speed hot forging process was applied to Nd-Fe-B and Nd-Fe-V as cast alloys in order to develop both the microstructure and the crystallographic texture appropriate for permanent anisotropic magnet properties. Neutron diffraction texture analyses are used to demonstrate the effect of the hot forging process on both kind of alloys. Microstructural changes are an important feature on forging in both cases. Coercivity is developed in the Nd-Fe-B alloy mainly from grain size reduction and disappearance of free iron. Stabilisation of the Nd(Fe,V)12 hard magnetic phase is achieved from the iron and Nd-rich microstructure of the starting Nd-Fe-V material. A comparison of the crystallographic textures of Nd2Fe14B and Nd(Fe,V)12 phases is done to account for the development of extrinsic magnetic anisotropy. In both cases, a nearly fibre texture is obtained in correlation with the symmetry of the deformation. However, the orientations are quite different in both alloys and the consequences on the magnetic properties are evidenced.

• Periodical: Solid State Phenomena (Volume 105)
• Pages: 291-296
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.105.291
• Online since: July 2005
• Authors: Sophie Rivoirard, I. Popa, Daniel Chateigner, B. Ouladdiaf, Patricia de Rango, Daniel Fruchart
• Keywords: Hot-Forging, Nd(Fe,V)₁₂ Phase, Nd₂Fe₁₄B Phase, Permanent Magnet, Texture

References

[1] C. Mishima, N. Hamada, H. Mitarai, Y. Honkura: Proc. of the 16th International Workshop on Rare-Earth magnets and their Applications, Sendai (2000), p.873.

[2] S. Rivoirard, P. de Rango, D. Fruchart, Y. Chastel, and C. Martin: Material Science and Engineering A 311(1-2) (2001), pp.121-127.

DOI: 10.1016/s0921-5093(01)00915-7

[3] G.P. Meisner, V. Panchanathan: J. Appl. Phys. 76 (10) (1994), p.6259.

[4] S.L. Tang, C.H. Wu, X.M. Jin, B.W. Wang, G.S. Li, B.Z. Ding, Y.C. Chuang: J. Magn. Magn. Mater. 189 (1998), p.202.

[5] S. Rivoirard, P. de Rango, D. Furchart, R. Perrier de la Bâthie : patent n° 98 06745 (1998).

[6] B.P. Hu, Y.Z. Wang, K.Y. Wang, G.C. Liu, W.Y. Lai: J. Magn. Magn. Mater. 140-144 (1995), p.1023.

[7] D. Chateigner, Pofint, exploitation directe des figures de pôles, licence L03084, CRISMAT/INEL (2003).

[8] D. Chateigner, H. Pillière, programme INEL/CRISMAT (1999).

[9] H.R. Wenk, S. Matthies, J. Donovan, D. Chateigner: J. Appl. Cryst. 31 (1998), pp.262-269.

[10] I. Popa, Ph. D. Thesis, Université J. Fourier, Grenoble, France (2003).

[11] S. Rivoirard, D. Chateigner, P. De Rango, D. Fruchart: Mater. Science Forum vols 402-412 (2002), pp.173-178.

DOI: 10.4028/www.scientific.net/msf.408-412.173