Reversible structural phase transition in Ni-Mn-Ga alloys in a magnetic field

Dikshteǐn, I. E.; Ermakov, D.I.; Коледов, В. В.; Koledov, L. V.; Takagi, Toshiyuki; Tulaikova, A. A.; Cherechukin, A. A.; Шавров, В. Г.

doi:10.1134/1.1331149

Cited by 38 publications

(20 citation statements)

References 5 publications

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“…However, experiments performed in fields up to 10 T have shown that in the case of Ni 54 Mn 21 Ga 25 the rate of shift is only about ϳ1 KT −1 . 8 Neutron-diffraction experiments under magnetic field on an alloy with similar composition confirm these results. 9 Parallel to the development of the understanding of the MSM effect in Ni-Mn-Ga and exploiting giant strains for applications, the search for other MSM materials also took up considerable place in the research agenda.…”

Section: Introductionsupporting

confidence: 75%

“…7 With this feature, it is possible to induce a reversible structural phase transformation, whereby strain can be fully recovered upon removal of the field without the necessity of prestraining the specimen. 8 In such magnetic-field-induced superelasticity, the maximum field-induced strain relies on the difference in the crystallographic dimensions in the martensitic and austenitic states. When a field of sufficient strength is applied at a temperature corresponding initially to the austenitic state, the shift in all characteristic temperatures ͑there-fore the shift in the hysteresis associated with the transformation͒ can be large enough so that the martensitic state is stabilized.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic superelasticity and inverse magnetocaloric effect in Ni-Mn-In

et al. 2007

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Applying a magnetic field to a ferromagnetic Ni 50 Mn 34 In 16 alloy in the martensitic state induces a structural phase transition to the austenitic state. This is accompanied by a strain which recovers on removing the magnetic field, giving the system a magnetically superelastic character. A further property of this alloy is that it also shows the inverse magnetocaloric effect. The magnetic superelasticity and the inverse magnetocaloric effect in Ni-Mn-In and their association with the first-order structural transition are studied by magnetization, strain, and neutron-diffraction studies under magnetic field.

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Section: Introductionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Magnetic superelasticity and inverse magnetocaloric effect in Ni-Mn-In

et al. 2007

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“…[28,54] If paramagnetic austenite transforms to ferromagnetic martensite, the MAE of martensite might no longer be negligible but the MAE of austenite can still be neglected for most MSMAs with cubic structure. In this case, the magnetic field favors formation of martensite due to a negative DG P!M mag , however, DG P!M MAE might play a role depending on the stress state and the relative direction of the easy axis with respect to the stress direction.…”

Section: Thermodynamical Considerations For Magnetic Field-induced Phmentioning

confidence: 99%

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Karaca

Караман

Başaran

et al. 2009

Adv Funct Materials

399

206

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Magnetic shape memory alloys (MSMAs) have recently been developed into a new class of functional materials that are capable of magnetic‐field‐induced actuation, mechanical sensing, magnetic refrigeration, and energy harvesting. In the present work, the magnetic &!hyphen;field‐induced martensitic phase transformation (FIPT) in Ni45Mn36.5Co5In13.5 MSMA single crystals is characterized as a new actuation mechanism with potential to result in ultra‐high actuation work outputs. The effects of the applied magnetic field on the transformation temperatures, magnetization, and superelastic response are investigated. The magnetic work output of NiMnCoIn alloys is determined to be more than 1 MJ m−3 per Tesla, which is one order of magnitude higher than that of the most well‐known MSMAs, i.e., NiMnGa alloys. In addition, the work output of NiMnCoIn alloys is orientation independent, potentially surpassing the need for single crystals, and not limited by a saturation magnetic field, as opposed to NiMnGa MSMAs. Experimental and theoretical transformation strains and magnetostress levels are determined as a function of crystal orientation. It is found that [111]‐oriented crystals can demonstrate a magnetostress level of 140 MPa T−1 with 1.2% axial strain under compression. These field‐induced stress and strain levels are significantly higher than those from existing piezoelectric and magnetostrictive actuators. A thermodynamical framework is introduced to comprehend the magnetic energy contributions during FIPT. The present work reveals that the magnetic FIPT mechanism is promising for magnetic actuation applications and provides new opportunities for applications requiring high actuation work‐outputs with relatively large actuation frequencies. One potential issue is the requirement for relatively high critical magnetic fields and field intervals (1.5–3 T) for the onset of FIPT and for reversible FIPT, respectively.

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“…Reports of studies aimed at developing functional Ni 2+x+y Mn 1−x Ga 1−y -based materials in which giant magnetostrains are obtained through the shift of martensitic transition temperature can be found in Refs [107][108][109][110][111]. Dikshtein et al [108] observed a reversible shift of the martensitic transition temperature for Ni 2+x Mn 1−x Ga (x = 0.16 − 0.19) alloys that was controlled by a magnetic field. The shape memory effect induced by the magnetic field and the related giant magnetically induced strains have been studied by Cherechukin et al [109], who used polycrystalline Ni 2+x−y Mn 1−x Fe y Ga samples.…”

Section: Structural Distortionsmentioning

confidence: 99%

Shape memory ferromagnets

Васильев¹,

Buchelnikov²,

Takagi³

et al. 2003

Phys.-Usp.

249

135

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In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field. Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energetically favorable compared to the reorientation of magnetic moments. In ferromagnetic Heusler alloys Ni2+xMn1−xGa the Curie temperature exceeds the martensitic transformation temperature. The fact that these two temperatures are close to room temperature offers the possibility of magnetically controlling the shape and size of ferromagnets in the martensitic state. In Ni2+xMn1−xGa single crystals, a reversible strain of ∼ 6% is obtained in fields of ∼ 1 T.

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Reversible structural phase transition in Ni-Mn-Ga alloys in a magnetic field

Cited by 38 publications

References 5 publications

Magnetic superelasticity and inverse magnetocaloric effect in Ni-Mn-In

Magnetic superelasticity and inverse magnetocaloric effect in Ni-Mn-In

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Shape memory ferromagnets

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