Advertisement

Journal of Materials Science

, Volume 29, Issue 3, pp 652–659 | Cite as

Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system

  • T. Kozakai
  • T. Miyazaki
Papers

Abstract

Phase separations in iron-rich Fe-Al-Co ternary alloys were investigated by means of transmission electron microscopy, differential thermal analysis and magnetization measurement. Two kinds of phase separations have been found at 923 K; A2+B2 and B2+B2*. The former occurs in a tongue-shaped composition region ranging from Fe-12 at % Al-15 at % Co to Fe-35 at % Al-45 at % Co and the latter appears in the small region bordering on the Fe-Al binary side of the A2+B2 field. These two-phase fields have theoretically been evaluated on the basis of the so-called Bragg-Williams-Gorsky model taking account of not only chemical but also magnetic interactions. The magnetic ordering accounts for the expansion of the A2+B2 coexistent region. In the measurement of magnetic properties, large increases in coercive force, Hc, and residual magnetic flux density, Br, were observed in the two-phase microstructures.

Keywords

Microstructure Transmission Electron Microscopy Magnetic Property Thermal Analysis Phase Separation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    G. Inden and W. Pitsh, Z. Metallkde 63 (1972) 253.Google Scholar
  2. 2.
    G. Schlatte and W. Pitsh, ibid. 66 (1975) 660.Google Scholar
  3. 3.
    P. R. Swann, L. Granas and B. Lehtinen, Metal Sci. 9 (1975) 90.Google Scholar
  4. 4.
    S. M. Allen and J. W. Cahn, Acta Metall. 23 (1975) 1017.Google Scholar
  5. 5.
    P. R. Swann, W. R. Duff and R. M. Fisher, Metall Trans. 3 (1972) 409.Google Scholar
  6. 6.
    K. Oki, H. Sagane and T. Eguchi, Jpn J. Appl. Phys. 13 (1974) 753.Google Scholar
  7. 7.
    H. Enoki, K. Ishida and T. Nishizawa, Metall. Trans. 18A (1987) 949.Google Scholar
  8. 8.
    K. Udo, K. Oki and T. Eguchi, J. Jpn Inst. Metals 49 (1985) 337.Google Scholar
  9. 9.
    M. Bouchard and G. Thomas, Acta Metall. 23 (1975) 1485.Google Scholar
  10. 10.
    G. Inden, Z. Metallkde 66 (1975) 577; 648.Google Scholar
  11. 11.
    T. Miyazaki, T. Tsuzuki and T. Kozakai, J. Mater. Sci. 21 (1986) 2557.Google Scholar
  12. 12.
    T. Kozakai, P. Z. Zhao and T. Miyazaki, in “Proceedings of the 1st Japan International SAMPE Symposium” 28 November–1 December 1989, Chiba, p. 139.Google Scholar
  13. 13.
    K. Hayashi, M. Hayakawa, W. Ishikawa, Y. Ochiai, Y. Iwasaki and K. Aso, J. Appl. Phys. 64 (1988) 772.Google Scholar
  14. 14.
    K. Hayashi, M. Hayakawa, W. Ishikawa, Y. Ochiai, H. Mastuda, Y. Iwasaki and K. Aso, ibid. 61 (1987) 3514.Google Scholar
  15. 15.
    M. Fukaya, P. Z. Zhao, T. Kozakai and T. Miyazaki, J. Mater. Sci. 25 (1990) 522.Google Scholar
  16. 16.
    M. Fukaya, T. Kozakai and T. Miyazaki, ibid. 26 (1991) 5420.Google Scholar
  17. 17.
    T. Miyazaki, K. Isobe, T. Kozakai and M. Doi, Acta Metall. 35 (1987) 317.Google Scholar
  18. 18.
    G. Inden, in “Materials Science and Technology”, Vol. 5, edited by R. W. Cahn et al. (VCH Press, Weinheim, 1991) p. 497.Google Scholar
  19. 19.
    N. J. Zaluzec, in “Introduction to Analytical Electron Microscopy”, edited by J. J. Hren et al. (Plenum Press, New York, 1979) p. 121.Google Scholar
  20. 20.
    G. Inden, Physica 103B (1981) 82.Google Scholar
  21. 21.
    Idem, Phys. Status Solidi. (a) 56 (1979) 177.Google Scholar
  22. 22.
    G. Inden and W. O. Meyer, Z. Metallkde 66 (1975) 725.Google Scholar
  23. 23.
    J. A. Oyedele and M. F. Collins, Phys. Rev. B 16 (1977) 3208.Google Scholar
  24. 24.
    C. Colinet. G. Inden and R. Kikuchi, Acta Metall. 41 (1993) 1109.Google Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • T. Kozakai
    • 1
  • T. Miyazaki
    • 1
    • 2
  1. 1.Centre for Cooperative ResearchNagoya Institute of TechnologyNagoyaJapan
  2. 2.Department of Materials Science and EngineeringNagoya Institute of TechnologyNagoyaJapan

Personalised recommendations