Premartensitic phenomena and other phase transformations in Ni–Mn–Ga alloys studied by dynamical mechanical analysis and electron diffraction

Chernenko, V.A.; Pons, J.; Seguı́, C.; Cesari, E.

doi:10.1016/s1359-6454(01)00320-2

Cited by 199 publications

(92 citation statements)

References 19 publications

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“…Furthermore, the phase diagrams of Ni 2 (Mn,Fe)Ga and Ni 2 (Mn,Fe) 1.48 Sn 0.52 open question to behavior of the concentration dependence of T M because it has been thought that the variation of T M follows the general rule related to the number of the valence electrons. That is, T M increases with increasing the number of the valence electrons per atoms, e/a, [16,17]. There have been many reports on the variation of T M on e/a for many kinds of FSMAs, such as Ni-Mn-Ga, Ni-Mn-Z (Z = In, Sn, Sb), and their element doping systems [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…In the figure, PM and FM mean paramagnetic and ferromagnetic states, respectively. It has been commonly thought that the martensitic transformation temperature, T M , is significantly sensitive to the concentration and the behavior is explained as a function of the number of the valence electrons per atoms, e/a, namely, T Ms increases with increasing e/a [16,17]. The explanation has been known to be a general rule to indicate the behavior of T Ms of the Ni-based FSMAs.…”

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confidence: 99%

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Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys

Umetsu

Fukushima

Kanomata

et al. 2013

Metals

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys

Umetsu

Fukushima

Kanomata

et al. 2013

Metals

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“…their shear elastic modulus C C C ' ( ) / = − 11 12 2 is very small. Moreover, ' C demonstrates a wellpronounced softening of these alloys on cooling in the cubic phase and reaches a minimum of about a few GPa near MT [65,66]. Fig.…”

Section: Structural Instability and Magnetostrictionmentioning

confidence: 88%

“…Fig. 2(a) illustrates a typical temperature evolution of the lowfrequency elastic modulus for the single crystalline Ni 2 MnGa sample on cooling [65]. The resonance ultrasonic measurements of the polycrystalline samples show similar temperature [65,70,71].…”

Section: Structural Instability and Magnetostrictionmentioning

confidence: 90%

Magnetoelastic Nature of Ferromagnetic Shape Memory Effect

Chernenko

L’vov

2008

MSF

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Abstract. The giant magnetically-induced deformation of ferromagnetic shape memory alloys results from the magnetic field-induced rearrangement of twinned martensite under the magnetic field. This deformation is conventionally referred to as the magnetic-field-induced-strain (MFIS). The MFIS is comparable in value with the spontaneous deformation of crystal lattice during the martensitic transformation of an alloy. Although the first observations of MFIS were reported more than 30 years ago, it has got a world-wide interest 20 years later after the creation of the Ni-Mn-Ga alloy system with its practically important room-temperature martensitic structure and experimental evidence of the large magnetostriction. The underlying physics as well as necessary and sufficient conditions for the observation of MFIS are the main focus of this chapter. A magnetostrictive mechanism of the unusual magnetic and magnetomechanical effects observed in Ni-Mn-Ga alloys is substantiated and a framework of consistent theory of these effects is outlined starting from the fundamental conception of magnetoelasticity and the commonly known principles of ferromagnetism and linear elasticity theories. A reasonable agreement between the theoretical deductions and available experimental data is demonstrated and, in this way, a key role of magnetoelastic coupling in the magnetomechanical behavior of Ni-Mn-Ga alloys is proved. A correspondence of magnetostrictive mechanism to the crystallographic features of MFIS and the basic relationships of the thermodynamics of solids are discussed.

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“…This effect was observed experimentally and described theoretically in Refs. [13,14]. It was shown that the abrupt changes of the temperature derivatives of elastic moduli observed for the Ni-Mn-Ga alloys with T M < T CA in the vicinity of their Curie points are induced by spontaneous volume magnetostriction.…”

Section: Influence Of Ferromagnetic Order On the Transformational Promentioning

confidence: 99%

Entropy Change Caused by Martensitic Transformations of Ferromagnetic Shape Memory Alloys

L’vov

Cesari

Kosogor

et al. 2017

Metals

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Abstract:In this paper, our most recent findings on the influence of magnetic order on the main transformational caloric and elastic properties of shape memory alloys (SMAs) are reviewed. It is argued that ferromagnetic order has a strong influence on the temperature interval of martensitic transformation (MT), the characteristics of stress-induced MT, and the shear elastic modulus of SMA. The problem of separation of the magnetic contributions to the entropy change ∆S and heat Q exchanged in the course of martensitic transformation (MT) of SMA is considered in general terms, and theoretical formulas enabling the solution of the problem are presented. As an example, the ∆S and Q values, which were experimentally determined for Ni-Mn-Ga and Ni-Fe-Ga alloys with different Curie temperatures T C and MT temperatures T M , are theoretically analyzed. It is shown that for Ni-Mn-Ga martensites with T M < T C , the ratio of elastic and magnetic contributions to the entropy change may be greater or smaller than unity, depending on the temperature difference T C -T M .

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Premartensitic phenomena and other phase transformations in Ni–Mn–Ga alloys studied by dynamical mechanical analysis and electron diffraction

Cited by 199 publications

References 19 publications

Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys

Mössbauer Spectroscopy Studies on Magnetic Properties for 57Fe-substituted Ni-Mn-Sn Metamagnetic Shape Memory Alloys

Magnetoelastic Nature of Ferromagnetic Shape Memory Effect

Entropy Change Caused by Martensitic Transformations of Ferromagnetic Shape Memory Alloys

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