Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
권호 표지
DOI QR코드

DOI QR Code

Anisotropic Mechanical Properties of Pr(Co,In)5-type Compounds and Their Relation to Texture Formation in Die-upset Magnets

  • Kwon, H.W. (Pukyong National University) ;
  • Kim, D.H. (Korea Institute of Materials Science) ;
  • Yu, J.H. (Korea Institute of Materials Science)
  • Received : 2011.03.24
  • Accepted : 2011.07.26
  • Published : 2011.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Die-upset magnets from a mechanically-milled Pr(Co,In)$_5$-type alloy are known to have a peculiar texture; the easy magnetization axis (c-axis) is perpendicular to the pressing direction. This peculiar texture is thought to be linked closely to the anisotropic mechanical properties of Pr(Co,In)$_5$-type hexagonal compounds. The hardness of the Pr(Co,In)$_5$-type crystal was measured using selectively grown grains in an annealed $Pr_{17}Co_{82}In_1$ alloy button, and the crystallographic orientation was determined by observing the magnetic domain image. The hardness (549 VHN) on the plane with a 'cogwheel'-type domain image was significantly higher than that (510 VHN) on the plane with a 'cigar'-type domain image, indicating that the inter-layer bonding force between the (000l) basal planes is stronger than that between the (hki0) planes. This suggests that the most probable slip plane is the (hki0) plane parallel to the c-axis. During die-upsetting of the Pr(Co,In)$_5$-type alloys the deformation proceeds by (hki0) plane slip, and the c-axis rotates to ultimately become oriented perpendicular to the pressing direction. It is proposed that the peculiar texture in the die-upset Pr(Co,In)$_5$-type magnets is probably developed by slip deformation of the (hki0) plane of the Pr(Co,In)$_5$-type grains.

Keywords

References

  1. J. Croat, J. F. Herbst, R. W. Lee and F. E. Pinkerton, J. Appl. Phys. 55, 2078 (1984). https://doi.org/10.1063/1.333571
  2. R. K. Mishra, E. G. Brewer, and R. W. Lee, J. Appl. Phys. 63, 3528 (1988). https://doi.org/10.1063/1.340731
  3. R. W. Lee, Appl. Phys. Lett. 46, 790 (1985). https://doi.org/10.1063/1.95884
  4. A. M. Gabay, Y. Zhang, and G. C. Hadjipanayis, J. Magn. Magn. Mater. 294, 287 (2005). https://doi.org/10.1016/j.jmmm.2004.12.025
  5. A. M. Gabay, M. Marinescu, J. F. Liu, and G. C. Hadjipanayis, IEEE Trans. Magn. 45, 4409 (2009). https://doi.org/10.1109/TMAG.2009.2024124
  6. L. H. Lewis, T. R. Thurston, V. Panchanathan, U. Wildgruber, and D. O. Welch, J. Appl. Phys. 82, 3430 (1997). https://doi.org/10.1063/1.365659
  7. L. Li and C. D. Graham Jr., IEEE Trans. Magn. 28, 2130 (1992). https://doi.org/10.1109/20.179419
  8. H. W. Kwon and J. H. Yu, IEEE Trans. Magn. 45, 4435 (2009). https://doi.org/10.1109/TMAG.2009.2023871
  9. H. W. Kwon and J. H. Yu, J. Magnetics 15, 32 (2010). https://doi.org/10.4283/JMAG.2010.15.1.032
  10. H. W. Kwon, unpublished work.
  11. A. W. Andreev and S. M. Zadvorkin, Physica B 172, 517 (1991). https://doi.org/10.1016/0921-4526(91)90011-3
  12. K. J. Strnat, IEEE Trans. Magn. 8, 511 (1972). https://doi.org/10.1109/TMAG.1972.1067368
  13. E. P. Wohlfarth and K. H. J. Buschow, Ferromagnetic Materials, Vol. 4, North-Holland Physics Publishing, Amsterdam (1988) p. 148.
  14. A. M. Gabay, W. F. Li, and G. C. Hadjipanayis, Proc. 21st Workshop on Rare-Earth Permanent Magnets and Their Applications, Bled, Slovenia, 138 (2010).
  15. Y. Luo and L. Zhang, Proc. 10th Workshop on Rare-Earth Permanent Magnets and Their Applications, Vol. II, Kyoto, Japan, 275 (1989).
  16. M. C. Shaw and G. J. DeSalvo, Met. Eng. Q. 12, 1 (1972).
  17. G. E. Dieter, Mechanical Metallurgy 2nd Ed., McGraw-Hill Book Company, New York (1976) p. 393.