Production and characterization of 〈100〉 textured magnetostrictive Fe–Ga rods

Hatchard, T. D.; George, A.E.; Farrell, Shannon P.; Adams, C. P.; Cormier, M.; Dunlap, R. A.

doi:10.1016/j.jallcom.2010.01.066

Cited by 10 publications

(2 citation statements)

References 22 publications

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“…A schematic representation of grains in a polycrystalline magnetostrictive material, and the domains within a grain are shown in figure 1. The related microstructure images and electron back-scattered diffraction images of polycrystalline Galfenol, illustrating the grain morphology and distribution of grain orientations can be referred in [58][59][60] A group of unit cells, possessing the same spontaneous magnetization direction within a grain, is generally referred to as domain in ferromagnetic and magnetostrictive materials. With respect to the crystallographic orientation of the grain, the direction of domains will be constrained along certain energetically preferred axes, known as easy axes [61].…”

Section: Magnetostrictive Materialsmentioning

confidence: 99%

A rate-dependent constitutive model incorporated in two-dimensional PolyFEM for Galfenol sensors

R¹,

Jayabal²

2021

Modelling Simul. Mater. Sci. Eng.

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A micromechanical model with rate effects is developed to constitute the nonlinear hysteresis sensor behaviour of Galfenol and embedded into a numerical framework, the polygonal finite element method. The model stems from the domain rotation events taking place at microlevel in response to the external magnetomechanical loads. The internal variables of the model to represent the material state at any instant are the volume fraction of the domains, and their evolution equations are derived using thermodynamic principles. Inter-domain effects within each grain are accounted in the form of back fields that act as hardening or softening parameters. The constitutive model is extended further to include the rate effects and then incorporated into a hybrid-magnetomechanical-formulation with Voronoi-based-discretization to study the behaviour of Galfenol. The Voronoi discretizations closely resemble the microstructure of Galfenol with each finite element specifying a random grain in the polycrystalline Galfenol. The developed framework is shown to simulate the major and minor loop sensor responses of the material with rate effects under complex loading conditions.

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Section: Magnetostrictive Materialsmentioning

confidence: 99%

A rate-dependent constitutive model incorporated in two-dimensional PolyFEM for Galfenol sensors

R¹,

Jayabal²

2021

Modelling Simul. Mater. Sci. Eng.

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“…These advantages make Fe-Ga alloy a unique magnetostrictive material. Much attention has been paid to the applications of Fe-Ga magnetostrictive alloy [8][9][10]. Therefore, the Fe-Ga alloys have been a research focus in the field of magnetostrictive materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of a Large Content of Yttrium Doping on Microstructure and Magnetostriction of Fe<sub>83</sub>Ga<sub>17</sub> Alloy

Zhao¹,

Tian²,

Yao

et al. 2019

SSP

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As-cast (Fe0.83Ga0.17)100-xYx (x=0, 3, 6 and 9) alloys were prepared by non-consumable vacuum arc melting furnace under a protective argon atmosphere. The crystal structures and surface morphologies of the alloys were studied by X-ray diffraction (XRD), optical microscope (OM) and scanning electron microscopy (SEM), combined with energy dispersive spectroscopy (EDS), respectively. The surface domain structures were observed by atomic force microscopy (AFM). The magnetostriction coefficients of the alloys were measured by strain gauging method. The results showed that the as-cast Fe83Ga17 alloy was composed only of a single phase of A2 with bcc structure, whereas the ternary Fe-Ga-Y alloys contain multiphase structure, besides the A2 phase, (FeGa)17Y1.76 new phases are observed as well, and an elemental yttrium phase appeared when the yttrium content increased to x=6 and x=9. Doping with yttrium have an effect on the change of magnetic domain structure of the binary alloy. With increasing x, the magnetostriction coefficient of the (Fe0.83Ga0.17)100-xYx alloys decreased sharply. The minimum magnetostriction coefficient is reduced to 12 ppm at the magnetic field of 426kA/m when x=9.

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Effect of the Growth Velocity on Microstructure, Orientation, and Magnetostriction in Fe81Ga19 Alloy

Liu

Jiang

2012

Metall Mater Trans A

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Production and characterization of 〈100〉 textured magnetostrictive Fe–Ga rods

Cited by 10 publications

References 22 publications

A rate-dependent constitutive model incorporated in two-dimensional PolyFEM for Galfenol sensors

A rate-dependent constitutive model incorporated in two-dimensional PolyFEM for Galfenol sensors

Effects of a Large Content of Yttrium Doping on Microstructure and Magnetostriction of Fe<sub>83</sub>Ga<sub>17</sub> Alloy

Effect of the Growth Velocity on Microstructure, Orientation, and Magnetostriction in Fe81Ga19 Alloy

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