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Magnetomechanical properties of Terfenol-D powder composites.

Daniel Lewandowski ,  Jerzy Kaleta ,  Rafał Mech 

Wroclaw University of Technology, Institute of Materials Science and Applied Mechanics (PWr - IMMT), Smoluchowskiego 25, Wrocław 50-370, Poland

Abstract

Main accepted purpose of the work was an identification of the magnetomechanical and mechanical properties of the magnetostrictive composites. An epoxy resin constituted the matrix of composite, and powder was a filler of material so-called giant magnetostrictive (Terfenol-D).

Working out the technology including productions of composite was a main task, procedures including: selection of composition, combining parameters, the elimination of oxidizing of powder, deaerate methods and getting the desired shape specimens. As a result, specimens were produced with different content of Terfenol-D powder in resin. Appropriate experiments were carried out to the purpose of getting mechanical and magnetomechanical characteristics. Value of the Young module has been determined for all produced composites and for clean resin but also solid Terfenol-D.

Next a magnetostriction of composites was examined and compared with solid Terfenol-D. The scope of changes of the magnetic field strength was included within the range 0 - 180 kA/m. Results of measurements of the magnetostriction were discussed. They showed that in produced composites the magnetostriction was lower as in solid Terfenol-D, but still several dozen times bigger than e.g. in nickel. They stated moreover, in the case of composites  leak of saturation effect under the influence of applied value of the intensity of magnetic field and linear character of the magnetostriction in the function of the intensity of the magnetic field H.

 

Produced composite is characterized by a small value of magnetomechanical damping, what is correlated with hysteresis loop. They showed moreover that the magnetostriction in produced composites largely depended on volume contents of Terfenol-D. Get results at the work create bases for taking the next problem which is the modelling of magnetostriction in composite. Moreover suggestions were formulated in the scope of the application of manufactured composites.

 

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Related papers

Presentation: Poster at E-MRS Fall Meeting 2008, Symposium C, by Daniel Lewandowski
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-13 08:52
Revised:   2009-06-07 00:48