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High Strength FeCo–V Intermetallic Alloy: Electrical and Magnetic Properties

Published online by Cambridge University Press:  01 June 2005

R.S. Sundar ,
S.C. Deevi  and
B.V. Reddy
R.S. Sundar
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
S.C. Deevi*
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
B.V. Reddy
Affiliation:
Chrysalis Technologies Incorporated, Richmond, Virginia 23237
*
a) Address all correspondence to this author. Present address: RD&E, Philip Morris USA, Richmond, VA 23261-6583 e-mail: Seetharama.c.deevi@pmusa.com This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/jmr/policy.html.
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Abstract

Age-hardening behavior of a new generation of FeCo alloys [Fe–40Co–5V–0.005B–0.015C–0.5Mo–0.5Nb (at.%)] is characterized by microhardness, tensile testing, electrical resistivity, and magnetic properties. The alloy exhibits maximum hardening when aged at 600 °C. Precipitation of γ2 (V-rich face-centered cubic phase) during aging appears to be responsible for the observed hardening behavior. The alloy exhibits superior creep resistance when subjected to solutionizing in γ phase field and aged at 600 °C. On the other hand, the room temperature tensile ductility of the aged alloy depends on the grain size, which in turn can be controlled by varying the solutionizing condition. The age-hardened alloy exhibits a room temperature electrical resistivity of 70–75 μΩ cm. The higher resistivity of the present alloy as opposed to the commercial FeCo–2V alloys is attributed to the high V content of the alloy. Structure-sensitive magnetic properties like coercivity and core losses of the alloy are affected by the aging treatment, and the maximum coercivity is observed when the alloy is aged at 600 °C. High coercivity of the alloy is attributed to the fine distribution of paramagnetic γ2 precipitate, fine grain size, and internal stress arising from phase transformation.

Keywords

AlloyElectrical propertiesMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1515 - 1522
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Westbrook, J.H.: Intermetallic Compounds (John Wiley & Sons, New York, 1967).Google Scholar
2Deevi, S.C., Sikka, V.K. and Liu, C.T.: Processing, properties, and applications of nickel and iron aluminides. Prog. Mater. Sci. 42, 177 (1997).CrossRefGoogle Scholar
3Stadelmaier, H.H. and Reinsch, B. Magnetic applications, in Intermetallic Compounds—Magnetic, Electrical and Optical Properties and Applications of Intermetallic Compounds, edited by Westbrook, J.H. and Fleischer, R.L. (John Wiley & Sons, New York, 2000), p. 31.Google Scholar
4Proc. Inter. Symp. on Nickel and Iron Aluminides Processing, Properties and Applications, edited by Deevi, S.C., Sikka, V.K., Maziasz, P.J., and Cahn, R.W. (ASM International, Cleveland, OH, 1996).Google Scholar
5Yamaguchi, M., Inui, H. and Ito, K.: High-temperature structural intermetallics. Acta Mater. 48, 307 (2000).CrossRefGoogle Scholar
6Quigley, R.E. More electric aircraft, in Proc. IEEE Applied Power Electronics Conf. (San Diego, CA, 1993), p. 906.Google Scholar
7Fingers, R.T.: Creep behavior of thin laminates of FeCo alloys for use in switched reluctance motors and generators, AFRL-PR-WP-TR-1999-2053 (1999).Google Scholar
8Bozorth, R.M.: Ferromagnetism (D. Van Nostrand, Princeton, NJ, 1951).Google Scholar
9Shang, C.H., Cammarata, R.C., Weihs, T.P. and Chien, C.L.: Microstructure and Hall–Petch behavior of FeCo-based Hiperco alloys. J. Mater. Res. 15, 835 (2000).CrossRefGoogle Scholar
10 Electronic Alloys #39, Carpenter Specialty Alloys, Hiperco Alloy 50HS data sheet (1995).Google Scholar
11Deevi, S.C., Sundar, R.S., and Sastry, D.H.: Iron-cobalt-vanadium alloy, U.S. Patent No. 6 685 882(B2) (2004).Google Scholar
12Kawahara, K.: Effect of additive elements on cold workability of FeCo alloys. J. Mater. Sci. 18, 1709 (1983).CrossRefGoogle Scholar
13Nishizawa, T. and Ishida, K. In Binary Alloy Phase Diagrams, edited by Massalski, T.B., Murray, J.L.L., Bennett, L.H., and Baker, H. (ASM, Metals Park, OH, 1986), p. 111.Google Scholar
14Raynor, G.V. and Rivlin, V.G.: Critical evaluation of constitution of cobalt-iron-vanadium system. Int. Metals Rev. 28, 211 (1983).Google Scholar
15Martin, D.L. and Geisler, A.H.: Constitution and properties of cobalt-iron-vanadium alloys. Trans. Am. Soc. Met. 44, 461 (1952).Google Scholar
16Mahajan, S., Pinnel, M.R. and Bennet, J.E.: Influence of heat treatments on microstructures in an Fe–Co–V alloy. Metall. Trans. 5, 1263 (1974).CrossRefGoogle Scholar
17Ashby, J.A., Flower, H.M. and Rawlings, R.D.: Gamma phase in an Fe–Co–2%V alloy. Met. Sci. 11, 91 (1977).CrossRefGoogle Scholar
18Pinnel, M.R. and Bennet, J. E.: Influence of annealing temperature and time on hysteresis parameters and microstructure of an Fe/Co/V alloy. IEEE Trans. Magn., Magnetism 11, 901 (1975).CrossRefGoogle Scholar
19Bennet, J.E. and Pinnel, M.R.: Correlation of magnetic and mechanical properties with microstructure in Fe/Co/2–3% V alloys. Metall. Trans. 5, 1273 (1974).Google Scholar
20Fiedler, H.C. and Davis, A.M.: The formation of gamma phase in vanadium Permendur. Metall. Trans. 1, 1036 (1970).CrossRefGoogle Scholar
21Sundar, R.S. and Deevi, S.C.: Effect of heat-treatment on the room temperature ductility of an ordered intermetallic Fe–Co–V alloy. Mater. Sci. Eng. 369, 164 (2004).CrossRefGoogle Scholar
22Couto, A.A. and Ferreira, P.I.: Phase transformations and properties of Fe–Co alloys. J. Mater. Eng. 11, 31 (1989).CrossRefGoogle Scholar
23Reddy, B.V., Deevi, S.C. and Kanna, S.N.: Magnetic properties of Al, V, Mn and Ru impurities in Fe–Co alloys. J. Appl. Phys. 93, 2823 (2003).CrossRefGoogle Scholar
24Kittel, C.: Introduction to Solid State Physics, 7th ed. (John Wiley & Sons, New York, 1996).Google Scholar
25Mahajan, S. and Olsen, K.M. An electron microscopic study of the origin of coercivity in an Fe–Co–V alloy, in Proc. Conf. on Magnetism and Magnetic Materials (AIP, San Francisco, CA, 1974), pp. 743, 744S.Google Scholar
26Kawahara, K. and Uehara, M.: A possibility for developing high strength soft magnetic materials in FeCo–X alloys. J. Mater. Sci. 19, 2575 (1984).CrossRefGoogle Scholar
27Chen, C.W. and Wiener, G.W.: Brittleness of cobalt-iron alloys. J. App. Phys. 30, 199 (1959).CrossRefGoogle Scholar
28Thornburg, D.R. and Colling, D.A.: Magnetic effects of long-range ordering in an iron-cobalt-2% vanadium alloy. Metall. Trans. 5, 2241 (1974).CrossRefGoogle Scholar
29Fingers, R.T., Carr, R.P. and Turgut, Z.: Effect of aging on magnetic properties of Hiperco 27, Hiperco 50 and Hiperco 50HS alloys. J. Apply. Phys. 91, 7848 (2002).CrossRefGoogle Scholar
30Kawahara, K.: Structures and mechanical properties of an FeCo–2V alloy. J. Mater. Sci. 18, 3427 (1983).CrossRefGoogle Scholar
31Chin, G.Y. and Wernick, J.H. Soft magnetic metallic materials, in Ferro-Magnetic Material, Vol. 2, edited by Wonlforth, E.P. (North-Holland, Amsterdam, The Netherlands, 1980), p. 55.Google Scholar
32Gautard, D., Couderchon, G. and Coutu, L.: 50-50 CoFe alloys: Magnetic and mechanical properties. J. Magn. Magn. Mater. 160, 359 (1996).CrossRefGoogle Scholar
33Sundar, R.S. and Deevi, S.C.: Influence of alloying elements on the mechanical properties of FeCo–V alloys. Intermetallics 12, 921 (2004).CrossRefGoogle Scholar
34Yu, R.H., Basu, S., Ren, L., Zhang, Y., Parvizi-Majidi, A., Unruh, K.M. and Xiao, J.Q.: High temperature soft magnetic materials: FeCo alloys and composites. IEEE Trans. Magn. 36, 3388 (2000).CrossRefGoogle Scholar