Stress- and magnetic field-induced entropy changes in Fe-doped Ni–Mn–Ga shape-memory alloys

Soto-Parra, Daniel; Vives, Eduard; González-Alonso, David; Mañosa, Lluı́s; Planes, Antoni; Romero, Ricardo; Matutes-Aquino, J.A.; Ochoa‐Gamboa, R.A.; Flores‐Zúñiga, H.

doi:10.1063/1.3309755

Cited by 46 publications

(17 citation statements)

References 12 publications

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“…However, indirect mC measurements are rare 19,40 , even though they are typically not compromised by heat leaks. If the applied stress varies rapidly then heat leaks can be minimised when making direct measurements of T.…”

Section: Measurement Protocolsmentioning

confidence: 99%

Caloric materials near ferroic phase transitions

2014

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A magnetically, electrically or mechanically responsive material can undergo significant thermal changes near a ferroic phase transition when its order parameter is modified by the conjugate applied field. The resulting magnetocaloric, electrocaloric and mechanocaloric (elastocaloric or barocaloric) effects are compared here in terms of history, experimental method, performance and prospective cooling applications.

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Section: Measurement Protocolsmentioning

confidence: 99%

Caloric materials near ferroic phase transitions

2014

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“…Although the giant ECE has been known of for some time, there is a lack of available scientific data needed for the successful design and implementation, or optimization, of multicomponent ECE systems. SMAs have been studied for their giant ECE via stress‐induced martensitic transformation and include NiTi, NiFeGa, CuZnAl, NiMnGaFe, NiMnGaCo, NiMnSn(Cu), and NiCoMnIn . These alloys have been reported to exhibit stress‐induced isothermal entropy changes of around 30, 10–20, 22.8, 5.5, 2.5, 1.75, and 5.5 J kg −1 K −1 under the stresses of 500, 150, 105, 9.3, 9.8, 5.24, and 75 MPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

Orientation Dependence of the Elastocaloric Effect in Ni₅₄Fe₁₉Ga₂₇ Ferromagnetic Shape Memory Alloy

Bruno

Караман

Chumlyakov

2017

Physica Status Solidi (b)

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The crystallographic anisotropy of elastocaloric effect (ECE) and relative cooling power (RCP) in Ni 54 Fe 19 Ga 27 shape memory alloy single crystals are studied via compression tests. Single crystals are studied along the [001], [123], and [011] austenite directions and yield different ECE behaviors and maximum RCPs for various strain levels. A thermodynamic framework using the Helmholtz free energy is employed to analyze the total entropy change as a function of strain. Thermodynamic losses are computed from the mechanical hysteresis of superelasticity experiments to quantify the strain dependent RCP. It is found that the [001] orientation generates the highest maximal RCP of 738 J kg À1 when unloaded from 200 MPa. This is attributed mainly to the large superelastic temperature window of 45 K. However, loading the crystals to stresses higher than 200 MPa causes a multistep transformation in the [011] direction, thus reducing the alloy's overall RCP by 135 J kg À1 . This is a consequence of the negative entropy change and large transformation hysteresis generated by the second-stage transformation in the [011] direction. Interestingly, if only the first-stage transformation in [011] is employed for the ECE, the [011] direction yields the highest RCP compared to [001] and [123] for any strain up to 3.5%.

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“…A stress-induced firstorder transition gives rise to an associated elastocaloric effect. Conventional elastocaloric effect has been found in magnetic shape-memory alloys 80,81 . Nevertheless the strong brittleness of these alloys precludes the application of large stresses, and consequently, the associated elastocaloric effect remains at lower values.…”

Section: Magnetic Heusler Alloys and The Inverse Magnetocaloric Effectmentioning

confidence: 99%

Advanced materials for solid-state refrigeration

2013

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Recent progress on caloric effects are reviewed. The application of external stimuli such as magnetic field, hydrostatic pressure, uniaxial stress and electric field give rise respectively to magnetocaloric, barocaloric, elastocaloric and electrocaloric effects. The values of the relevant quantities such as isothermal entropy and adiabatic temperature-changes are compiled for selected materials. Large values for these quantities are found when the material is in the vicinity of a phase transition. Quite often there is coupling between different degrees of freedom, and the material can exhibit cross-response to different external fields. In this case, the material can exhibit either conventional or inverse caloric effects when a field is applied. The values reported for the many caloric effects at moderate fields are large enough to envisage future application of these materials in efficient and environmental friendly refrigeration.

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Stress- and magnetic field-induced entropy changes in Fe-doped Ni–Mn–Ga shape-memory alloys

Abstract: Articles you may be interested inLarge reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys

Cited by 46 publications

References 12 publications

Caloric materials near ferroic phase transitions

Caloric materials near ferroic phase transitions

Orientation Dependence of the Elastocaloric Effect in Ni₅₄Fe₁₉Ga₂₇ Ferromagnetic Shape Memory Alloy

Advanced materials for solid-state refrigeration

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Stress- and magnetic field-induced entropy changes in Fe-doped Ni–Mn–Ga shape-memory alloys

Abstract: Articles you may be interested inLarge reversible entropy change at the inverse magnetocaloric effect in Ni-Co-Mn-Ga-In magnetic shape memory alloys

Cited by 46 publications

References 12 publications

Caloric materials near ferroic phase transitions

Caloric materials near ferroic phase transitions

Orientation Dependence of the Elastocaloric Effect in Ni54Fe19Ga27 Ferromagnetic Shape Memory Alloy

Advanced materials for solid-state refrigeration

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Orientation Dependence of the Elastocaloric Effect in Ni₅₄Fe₁₉Ga₂₇ Ferromagnetic Shape Memory Alloy