Role of Heat Treatment in Magnetic Properties of Fe-Co-Ni-Al-Cu-Ti Alloy

Abstract:

Anisotropic (Fe-24Co-15Ni-7.5Al-3Cu-0.3Ti) permanent magnets were prepared by alloy casting technique. Samples were characterized for structural, microstructural and magnetic properties using x-ray diffractrometer (XRD), Scanning electron microscope (SEM) equiped with energy dispersive x-ray spectrometer and DC magnetometer. There is a relation between metallurgical structure and magnetic properties. The magnetic properties of this type of alloy depend on heat-treatment that is controlling the cooling rate in the presence of magnetic field and double aging. How magnetic properties vary with heat treatment is discussed in this work. XRD studied revealed that the alloy was single phase (bcc) with (110) as the major crystallographic plane. Optical and SEM micrographs showed the presence of (Ti,S)-rich precipitates which are randomly distributed in the matrix. Their composition was analyzed by EDX analysis.

• Periodical: Key Engineering Materials (Volumes 510-511)
• Pages: 394-398
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.510-511.394
• Online since: May 2012
• Authors: S. Imran, M.S. Awan, M.N. Sarwar, S. Akhtar, M. Farooque
• Keywords: Anisotropic Alloy, Microstructural, Precipitate, Single Phase

References

[1] T. Abraham: JOM, 16-18 (1995).

[2] T. Kubota, G. Wakni and m. Hagati: IEEE trans. On magnetic, vol. 34 (6), (1998).

[3] A. kubicki. Kolodziej, Magnesy trawle odlewane typu Alnico – prezglad odlewnictwa 10-11'(2004).

[4] N. V. Philips Gloeilampenfabrieken, ' Improvements in Permanent Magnets and processing of treating Alloys for the Magnets', Brit. pat. 522, 731, 26th June.

[5] E.P. Wohlfarts, Editor: in Ferromagnetic Materials, 3, 139 (1985).

[6] J.E. Gould, Editor: in Cobalt alloy Permanent Magnets, Cobalt monograph series, General Electric Research Laboratories, Shenectady, N. Y, 25-26 (1971).

[7] A.S. Yermolenko and Ya. S. shur, physicsof metals and metallograpy, 1964, 17, 31.

[8] E. Planchard C. Bronner and J. Sauuze, Cobalt, 1965, 28, 132.

[9] M. McCaig, Proc. Phys. Soc, 1957, 70 (9B), 823.

[10] Jounal of the Australian Institute of Metals Vol: 14(1) Feb 69.

[11] T. I Bulygina and V. V Sergeyev, Magnetostructural analysis of High-Coercivity Alloys of the Alnico: Fiz. Metal. Metalloved, 27(4) 103-109 (1969).

[12] Mc. Currie: in Ferromagnetic Materials, E.P. Wohlfarth, ed. North-Holland, New York, vol. 3 (1982).

[13] A. G. Cleg and M. McCaig, proc. Phys. Soc., 1957, 70 (9B), 817.

[14] J. van wieringen, Philips Technical review, 1967, 28 (2), 33.