Martensitic Transformations in Ni-Mn-Ga System Affected by External Fields

Chernenko, V.A.; Babii, O. M.; L’vov, Victor S.; Mccormick, Paul

doi:10.4028/www.scientific.net/msf.327-328.485

Cited by 15 publications

(13 citation statements)

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“…(2) The advancement in a phenomenological magnetoelastic model of the ferromagnetic martensite 10,[12][13][14][15] enables a numerical computation of the field-induced deformation and provides the quantitative agreement between the theory and experiment (see Fig. 3).…”

Section: Discussionmentioning

confidence: 99%

“…11) Furthermore, a resemblance between the ordinary mechanical stressing of specimen and the stressing caused by the magnetic field application has been used for the evaluation of GMSE in saturating magnetic field. [12][13][14][15] An enlargement of magnetic-field-induced strains in the temperature range of coexistence of parent and martensitic phases was deduced from the magnetoelastic model. 13) (This effect was observed experimentally, e.g., in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

et al. 2002

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An equivalence principle for mechanical and magnetoelastic stresses is used for the quantitative theoretical description of giant magnetostrain effect in ferromagnetic martensite. Field-induced strains are computed in the framework of phenomenological magnetoelastic model for two different orientations of magnetic field with respect to the crystal axes. Good agreement between the theoretical and experimental field dependencies of the strains in Ni-Mn-Ga alloys is achieved.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

et al. 2002

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“…Each curve clearly show a jump accompanying the MT followed by a strong descending behavior due to approaching to the Curie temperature. A different sign of jumps is well known 2,6,9) to 3 using the Landau approach for the description of the cubic-tetragonal MT in which the anisotropic terms are naturally disregarded. In this analysis, our previous results of Refs.…”

Section: Methodsmentioning

confidence: 99%

“…7,8) In Ni-Mn-Ga alloys, the value of magnetization jump is found to be dependent on the temperature interval between the T M and T C . 6,9,10) This dependence was recently studied in a systematic way for the Ni-rich/Mn-deficient alloy series. 6) Normally, the experimental determination of the ÁM is performed by recording the temperature dependence of magnetization, MðTÞ, in the saturating magnetic field, H S , which is in case of Ni-Mn-Ga alloys is around 10 kOe.…”

Section: Introductionmentioning

confidence: 99%

Martensitic Transformation in Ni–Mn–Ga Alloy Under High Magnetic Fields

et al. 2006

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An effect of magnetic field on the martensitic transformation (MT) temperature in ferromagnetic shape memory Ni 49:4 Mn 27:7 Ga 22:9 single crystal with the MT temperature 285 K is studied by measuring and theoretical treatment of the magnetization versus temperature dependencies in a wide range of the high magnetic fields higher than saturating one. In this way, a linear approximation of the field dependence of MT temperature was proved for the high-field range. The linear increase of transformation temperature is characterized by the slope of 3:5 Â 10 À2 K/kOe. This value is essentially larger than the value 2 Â 10 À2 K/kOe reported by Gonzales-Comas et al. [Phys. Rev. B 60 (1999) 7085-7090] for the Ni 49:5 Mn 25:4 Ga 25:1 alloy with a low MT temperature. This difference is in an agreement with the predictions of the Landau theory.

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“…The MT of Ni-Mn-Ga alloy may be described using the following form [12,13] are the magnetoelastic stresses [13], which are related to the dimensionless magnetoelastic constant δ and magnetization vector components…”

Section: Theoretical Groundsmentioning

confidence: 99%

Evaluation of Magnetostriction of the Single-Variant Ni-Mn-Ga Martensite

L'vov

Glavatskyy²,

Glavatska³

2009

MSF

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Abstract. The temperature dependence of ordinary magnetostriction of the axially compressed Ni-Mn-Ga alloy with the low values of shear elastic modulus C'(T) ~ 1 -10 GPa has been evaluated theoretically in the framework of Landau theory. The computations showed that the compression with 50 MPa stress reduces the ordinary magnetostriction by factor 3 at room temperature. Nevertheless, the magnetostriction of compressed alloy exceeds the value of 10 -4 in the whole temperature range of martensitic phase stability, strongly depends on the temperature in the vicinity of martensitic transformation (MT), and is practically constant well below MT temperature. Therefore, the purposeful search for the alloy with the low value of shear elastic modulus and high MT temperature (well above 300 K) may result in the discovery of good magnetostrictive material. This material will posses the temperature-independent magnetostriction value about of 10 -4 -10 -3 and rather low electric conductivity enabling the technical applications of this material in dynamic regimes.

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Martensitic Transformations in Ni-Mn-Ga System Affected by External Fields

Cited by 15 publications

References 0 publications

Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

Martensitic Transformation in Ni–Mn–Ga Alloy Under High Magnetic Fields

Evaluation of Magnetostriction of the Single-Variant Ni-Mn-Ga Martensite

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Martensitic Transformations in Ni-Mn-Ga System Affected by External Fields

Cited by 15 publications

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Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

Magnetic-Field-Induced Stresses and Magnetostrain Effect in Martensite

Martensitic Transformation in Ni&ndash;Mn&ndash;Ga Alloy Under High Magnetic Fields

Evaluation of Magnetostriction of the Single-Variant Ni-Mn-Ga Martensite

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Martensitic Transformation in Ni–Mn–Ga Alloy Under High Magnetic Fields