Apparent Poisson’s Ratio for Fe-Ga Alloy Single Crystal due to Magnetostriction

Masaki Fujita; Takehito Ikeuchi; Akihiro Koyama; Muneyuki Imafuku; Shun Fujieda; Shigeru Suzuki

doi:10.4028/www.scientific.net/MSF.941.879

Paper Titles

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Modification of LPSO Structure in Mg-Ni-Y Alloy with Strontium
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Prediction of Magnetostrictive Properties of Fe-Ga Alloy Based on Internal Energy Model with Magnetomechanical Effect
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Apparent Poisson’s Ratio for Fe-Ga Alloy Single Crystal due to Magnetostriction
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Investigation of the Effect of Homogenization Practice of 6063 Alloy Billets on Beta to Alpha Transformation and of the Effect of Cooling Rate on Precipitation Kinetics
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Unique Effect of Carbon Addition on Development of Deformation and Recrystallization Textures in Heavily Cold-Rolled Fe-3%Si Alloys
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Control of Dispersolds in 7475 Aluminum Alloy
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Solidification and Microstructural Control in Selective Electron Beam Melting of Co-29Cr-10Ni-7W Alloy
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Apparent Poisson’s Ratio for Fe-Ga Alloy Single...

Apparent Poisson’s Ratio for Fe-Ga Alloy Single Crystal due to Magnetostriction

Abstract:

Fe-Ga alloys are used for practical magnetostrictive materials. The understanding of mechanical properties under magnetic field is very important for their application to vibration power generation devices. Especially, Poisson’s ratio is one of key parameters because it is strongly related with the volume change of materials. In the study, we investigated actual behavior of Poisson’s ratio due to magnetostriction, instead of just the mechanical one. The sample was cube-oriented Fe-18mol%Ga single crystal disc. Static magnetic fields were applied in various directions parallel to (001). Strain values in various directions were measured by strain gauge and X-ray diffraction. And then, tri-axial strain analysis for single crystal was carried out. Theoretically, Poisson’s ratio due to magnetostriction is known to be 0.5, (volume conservative), value is close to the mechanical one, 0.45. On the other hand, we found that Poisson’s ratio exhibits anisotropic behavior despite the elastic constants are equivalent in [010] and [001]. This phenomenon is attributable to the magnetic domain structure under zero magnetic field. In this presentation, we will discuss this apparent Poisson’s ratio considering the volume strain and magnetostriction comprehensively.