Large tensile superelasticity from intermartensitic transformations in Ni49Mn28Ga23 single crystal

Chernenko, V.A.; Villa, Elena; Salazar, Daniel; Barandiarán, J.M.

doi:10.1063/1.4942195

Cited by 45 publications

(18 citation statements)

References 22 publications

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“…EDX analyses confirmed nominal composition Co 49. 4 Ni 20.6 Ga 30.0 , which corresponds well with desired one (Fig. 2).…”

Section: Resultssupporting

confidence: 86%

“…So far, many alloys with aforementioned properties have been discovered, for example alloys NiMnGa [2][3][4], FePd [5], CoNi(Al or Ga) [6][7][8][9], FeMnAlNi [10,11], Co2CrGaSi [12], or FSA are usually produced by arcmelting [6,9,11,12], by rapid solidification method, or by growing of single crystals [4,10] with additional annealing. However, melt spinning method can help to avoid * corresponding author; e-mail: jakub.mino@student.upjs.sk long-term annealing (or at least significantly reduce it) keeping good qu ality of highly textured polycrystalline ribbons [13].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

et al. 2017

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Ribbons of composition Co49Ni21Ga30 have been prepared by melt-spinning method. X-ray diffraction investigation revealed single phase with B2 structure at room temperature. However, analysis of magnetization dependence of temperature suggests phase transition in the range 150-250 K. Resistivity measurements revealed similar transition with shift to higher temperatures in the presence of magnetic field.

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“…EDX analyses confirmed nominal composition Co 49. 4 Ni 20.6 Ga 30.0 , which corresponds well with desired one (Fig. 2).…”

Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

et al. 2017

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“…Pop-ins typically stem from bursts of dislocations or stress-induced displacive phase transformations. 29 Ni-Mn-Ga is known to undergo stress-induced intermartensitic transformations, 30,31 which may cause the pop-ins. Pseudoelastic , and (i) thermal cycling through the martensite to austenite phase transition and back.…”

Section: Discussionmentioning

confidence: 99%

Localized deformation in Ni-Mn-Ga single crystals

Davis

Efaw

Patten

et al. 2018

Journal of Applied Physics

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The magnetomechanical behavior of ferromagnetic shape memory alloys such as Ni-Mn-Ga, and hence the relationship between structure and nanoscale magnetomechanical properties, is of interest for their potential applications in actuators. Furthermore, due to its crystal structure, the behavior of Ni-Mn-Ga is anisotropic. Accordingly, nanoindentation and magnetic force microscopy were used to probe the nanoscale mechanical and magnetic properties of electropolished single crystalline 10M martensitic Ni-Mn-Ga as a function of the crystallographic c-axis (easy magnetization) direction relative to the indentation surface (i.e., c-axis in-plane versus out-of-plane). Load-displacement curves from 5-10 mN indentations on in-plane regions exhibited pop-in during loading, whereas this phenomenon was absent in out-of-plane regions. Additionally, the reduced elastic modulus measured for the c-axis out-of-plane orientation was $50% greater than for in-plane. Although heating above the transition temperature to the austenitic phase followed by cooling to the room temperature martensitic phase led to partial recovery of the indentation deformation, the magnitude and direction of recovery depended on the original relative orientation of the crystallographic c-axis: positive recovery for the in-plane orientation versus negative recovery (i.e., increased indent depth) for out-of-plane. Moreover, the c-axis orientation for out-of-plane regions switched to in-plane upon thermal cycling, whereas the number of twins in the in-plane regions increased. We hypothesize that dislocation plasticity contributes to the permanent deformation, while pseudoelastic twinning causes pop-in during loading and large recovery during unloading in the c-axis in-plane case. Minimization of indent strain energy accounts for the observed changes in twin orientation and number following thermal cycling.

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“…However, a pronounced tendency takes place: the experimental values of the elastic moduli of different FSMAs reported in the recent works are lower than the values measured previously. For example, the values of elastic modulus~2 GPa were registered in Ni 29 Mn 48 Ga 23 single crystal using dynamic mechanical analysis [29]; a linear decrease of shear modulus on approaching the temperature of Fe 3 Pt alloy was reported very recently, the extrapolation of the experimental line to T MS resulted in the estimation C (T MS ) ∼ 0.6 GPa [30]. (c) A strong increase of ∆S −1 with (T MS − T MF ) was observed in metamagnetic alloys such as Ni-Mn-In and Ni-Mn-(In,Sn)-Co, see Figure 4.…”

Section: Discussionmentioning

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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Large tensile superelasticity from intermartensitic transformations in Ni49Mn28Ga23 single crystal

Cited by 45 publications

References 22 publications

Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

Magnetic Characterization of Melt-Spun Co-Ni-Ga Ferromagnetic Superelastic Alloy

Localized deformation in Ni-Mn-Ga single crystals

Entropy Change Caused by Martensitic Transformations of Ferromagnetic Shape Memory Alloys

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