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Magnetostrictive Materials

  • D. McMasters
Conference paper

Abstract

The large magnetostrlctive strain, λ, possessed by Terfenol-D, TbxDy1-xFey, has been sustained from the research laboratory to commercial production. Transducer drive elements produced by two methods, free-standing zone melt (FSZM) and modified Bridgman (MB), are available in various sizes and shapes. These processes are briefly described. The FSZM single crystal material has about 20% more strain than does the grain oriented MB material. The effects of heat treatment and stoichiometry on the magnetostriction of these drive elements are reported. The recent price reduction is the result of an extensive evaluation of the raw materials, Tb and Dy obtained from several sources. The purity and therefore the cost of these raw materials are the variables and the product was not acceptable if performance was sacrificed. Improved processing techniques and large volumes will lead to further price reductions. Recently, emphasis has been placed on performance consistency, both end-toend and lot-to-lot, and the results of these efforts to produce matched sets of drivers are reported. The potential uses of these giant magnetostrictive materials remain large. This is evident from the numerous first and second stage prototype devices that have been successfully completed. The commercialization of a device that uses a large volume of Terfenol-D drivers will have a major impact on the current applications activities and we are seeing evidence of this becoming a reality in the near future, especially in the areas of sonar, vibration isolation, high force actuators and linear motors.

Keywords

Vibration Isolation Price Reduction Magnetostrictive Material Giant Magnetostrictive Material Volume Discount 
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.

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References

  1. 10.1
    J.L. Butler, and S.J. Ciosek, Rare earth iron octagonal transducer, J. Acoust. Soc. Am., 67, 1809–1811 (1980).ADSCrossRefGoogle Scholar
  2. 10.2
    F. Claeyssen, D. Boucher, and C. Pohlenz, Analysis of a magnetostrictive Tonpilz transducer, J. Acoust. Soc. Am., 81, S89 (1987). 131Google Scholar
  3. 10.3
    R. Porzio, W.J. Harrold, and J.R. Sturges, Self-biased modular magnetostrictive driver and transducer, U.S. Pat. No. 4, 846,450 (July 4, 1989 ).Google Scholar
  4. 10.4
    T. Akuta, An application of giant magnetostrictive material to high power actuators, Proceedings of the Tenth International Workshop on Rare-earth Magnets and Their Applications, Vol. 1, 359–368, (1989)Google Scholar
  5. 10.5
    A.E. Ciark, Magnetostrictive rare earth - Fe2 compounds, Chap. 7 in Ferromagnetic Materials, Vol. 1, ed. by E.P. Wohlfarth (North-Holland, 1980 ), pp. 531–589.Google Scholar
  6. 10.6
    H.T. Savage, R. Abbundi, A.E. Clark, and O.D.McMasters, Permeability, magnetomechanical coupling and magnetostriction in grain-oriented rare earth-iron alloys, J. Appl.« Phys. 50, 1674–1676 (1979).ADSCrossRefGoogle Scholar
  7. 10.7
    A.E. Clark, and H.T. Savage, Magnetostriction of rare earth - Fe2 compounds under compressive stress, Journal of Magnetism and Magnetic Materials 31–34 (North-Holland, 1983 ), pp. 849–851.Google Scholar
  8. 10.8
    A.E. Clark, J.P. Teter, and O.D. McMasters, Magnetostriction jumps in twinned Tbo.3Dyo.7Fe1.9Z J- Appl. Phys. 63, 3910–3912 (1988).Google Scholar
  9. 10.9
    J.D. Verhoeven, J.E. Ostenson, E.D. Gibson, and O.D. McMasters, The effect of composition and magnetic heat treatment on the magnetostriction of TDyFey twinned single crystals, J. Appl. Phys., 66 (2), 772–779 (1989).ADSCrossRefGoogle Scholar
  10. 10.10
    F. Claeyssen, D. Boucher, and S. Faure, Characterization of length expander magnetostrictive rare earth-iron rods under normal use conditions in transducers, J. Acoust. Soc. Am., 83, S20 (1988).ADSCrossRefGoogle Scholar
  11. 10.11
    A.E. Clark, J.P. Teter, M. Wun-Fogle, M. Moffett, and J. Lindberg, Magnetomechanical coupling in Bridgman-grown 9 at high drive levels, Proc. 34th Annual Conf. on Magnetism and Magnetic Materials, Boston, MA, Nov., 1989.Google Scholar
  12. 10.12
    M.B. Moffett, A.E. Clark, M. Wun-Fogle, J.F. Lindberg, J.P. Teter, and E.A. McLaughlin, Characterization of Terfenol-D for magnetostrictive transducers, submitted to J. Acoust. Soc. Am., Feb. 1990.Google Scholar
  13. 10.13
    F. Claeyssen, D. Boucher, and S. Faure, Comparative study of Terfenol-D piezomagnetic constants, Proceedings of the Second International Conference on Giant Magnetostrictive Alloys and Amorphous Alloys for Actuators and Sensors, (Marbella, Spain, Oct. 12–14, 1988 ).Google Scholar
  14. 10.14
    K.C. Pitman, A. Branwood, and A.R. Piercy, Device oriented measurements in Terfenol materials, loc. cit., Réf. 10. 13.Google Scholar
  15. 10.15
    O.D. McMasters, Method of forming magnetostrictive rods from rare earth-iron alloys, U.S. Patent No. 4,609,402, September 2, 1986.Google Scholar
  16. 10.16
    E.D. Gibson, J.D. Verhoeven, F.A. Schmidt, and O.D. McMasters, Continuous method for manufacturing grain oriented magnetostrictive bodies, U.S. Patent No. 4,770,704, September 13, 1988.Google Scholar
  17. 10.17
    J.D. Verhoeven, O.D. McMasters, and E.D. Gibson, Thermal treatment for increasing magnetostrictive response of rare earth-iron alloy rods, U.S. Patent No. 4, 849, 034, July 18, 1989.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • D. McMasters
    • 1
  1. 1.Edge Technologies, Inc. AmesUSA

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