Journal of Materials Science

, Volume 26, Issue 24, pp 6625–6630 | Cite as

Metallography and resistivity measurements on a 2–17 type alloy

  • F. Gencer
  • I. R. Harris


Metallography and electrical resistivity measurements (ρ t o ) were carried out on an isothermally aged bulk alloy with a substitution composition of Sm(Co0.67Cu0.08Fe0.22Zr0.028)8.45. The as-cast alloy was found to consist of four phases: (A) zirconium-rich phase, (B) samarium- and copper-rich phase, (C) cobalt- and iron-rich phase, and (D) very rich in zirconium phase. After annealing at 1170 °C for 5 h, phase B entered into solid solution, suggesting that the other three phases are the stable phases in this system at this temperature. Large decreases in the electrical resistivity were observed after isothermal ageing at temperatures between 650 and 900 °C inclusive. After an initial decrease in the resistivity values at 650, 700, 750 and 800 °C an increase was observed leading to small peaks. The height of this maximum decreased with increasing ageing temperature and disappeared at 830 °C. This effect can be ascribed to the solubility variations, and an activation energy has been derived from the resistivity peaks.


Zirconium Activation Energy Cobalt Electrical Resistivity Resistivity Measurement 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    R. K. Mishra, G. Thomas, T. Yoneyama, A. Fukuno andT. Ojima,J. Appl. Phys. 52 (1981) 2517.Google Scholar
  2. 2.
    L. Rabenberg, R. K. Mishra andG. Thomas,ibid. 53 (1982) 2389.Google Scholar
  3. 3.
    A. E. Ray,IEEE Trans. Magn. MAG-20 (1984) 1614.Google Scholar
  4. 4.
    H. Kronmuller, K. D. Durst, W. Ervens andW. Fernengel,ibid. MAG-20 (1984) 1589.Google Scholar
  5. 5.
    C. H. Allibert, S. Derkaoi, F. Delannay andJ. Laforest, in Proceedings of 9th International Workshop on Re-Co Permanent Magnets and their Applications (1987) p. 363.Google Scholar
  6. 6.
    J. Fidler, P. Skalicky andF. Rothwarf,IEEE Trans. Magn. MAG-19 (1983) 2041.Google Scholar
  7. 7.
    B. Zhang, J. R. Blachere, W. A. Soffa andA. E. Ray,J. Appl. Phys. 64 (1988) 5730.Google Scholar
  8. 8.
    H. A. Leupold, F. Rothwarf, J. T. Breslin, J. J. Winter, A. Tauber andD. I. Paul,ibid. 53 (1982) 2392.Google Scholar
  9. 9.
    J. D. Livingston,ibid. 12 (1975) 5259.Google Scholar
  10. 10.
    T. Bailey andI. R. Harris, in Proceedings of the 9th International Workshop on Re-Co Permanent Magnets and their Application, edited by C. Herget and R. Poerschke, Bad Soden, DPG-GMPH, FRG (1987) p. 437.Google Scholar
  11. 11.
    A. Kianvash andI. R. Harris,J. Mater. Sci. 20 (1985) 680.Google Scholar
  12. 12.
    H. W. Kwon, MPhil thesis, University of Birmingham (1988).Google Scholar
  13. 13.
    R. E. Reed-Hill, “Physical Metallurgy Principles”, 2nd edn. (Van Nostrand, 1973).Google Scholar
  14. 14.
    F. Gencer, MPhil thesis, University of Birmingham (1987).Google Scholar

Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • F. Gencer
    • 1
  • I. R. Harris
    • 1
  1. 1.School of Metallurgy and MaterialsUniversity of BirminghamBirminghamUK

Personalised recommendations