Simultaneously achieved large reversible elastocaloric and magnetocaloric effects and their coupling in a magnetic shape memory alloy

Qu, Yuhai; Cong, Daoyong; Li, S.H.; Gui, Wanyuan; Nie, Zhihua; Zhang, M.H.; Ren, Yang; Wang, Y.D.

doi:10.1016/j.actamat.2018.03.031

Cited by 132 publications

(39 citation statements)

References 64 publications

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“…Conversely, ferromagnetic shape memory alloys (FMSMAs), e.g., NiMnGa, NiFeGa, and NiMnX (X = In, Sn, Sb), may incorporate structural and magnetic transitions. The NiMn‐based and NiFeGa‐based alloys also exhibit large Δ T ad 4–8.6 and 4–13.5 K, respectively.…”

Section: The Martensite Transformation Temperatures (Ms Mf As and mentioning

confidence: 99%

Enhancing the Elastocaloric Cooling Stability of NiFeGa Alloys via Introducing Pores

et al. 2020

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Elastocaloric effect (eCE) is an emerging solid-state refrigeration technology that may provide the solution to replace the traditional vapor compression technique due to its high efficiency, low cost and eco-friendliness. [1] The elastocaloric materials undergoing phase transitions may exhibit the large adiabatic temperature change (ΔT ad) or isothermally entropy change (ΔS iso) under the influence of uniaxial stresses. [2,3] Mostly, the investigations focused on conventional shape memory alloys (SMAs) show first-order martensite transformation (FOMT). [4-8] Giant ΔT ad has been reported in these alloys, for example, 25-30 K in NiTi-based [9-11] and 12-16.5 K in Cu-based [12-14] alloys. Conversely, ferromagnetic shape memory alloys (FMSMAs), e.g., Ni─Mn─Ga, Ni─Fe─Ga, and Ni─Mn─X (X ¼ In, Sn, Sb), may incorporate structural and magnetic transitions. The Ni─Mn-based [15-19] and Ni─Fe─Ga-based alloys [20-24] also exhibit large ΔT ad 4-8.6 and 4-13.5 K, respectively. The cyclic stability and good functional fatigue resistance in elastocaloric materials are as important as to obtain large ΔT ad. For instance, NiTi alloys deteriorate from low fatigue life at 4% strain [25,26] and their ΔT ad decrease about 40% [8] over the first 100 cycles due to plasticity. [27] Generation of dislocations, microcracks, or elastic incompatibility [28,29] during martensite transformation (MT) produce the irreversibility [16] over multiple cycles in metamagnetic Ni─Mn─X (X ¼ In, Sn, Sb) alloys. The textured polycrystalline Ni─Mn─Ga alloy [30] shows the cyclic stability up to 50 cycles due to large defect density and transition strain, whereas single β-phase Ni─Fe─Ga alloy sustains only ten cycles [22] due to the formation of intergranular cracks. Therefore, large reversible ΔT ad and good cyclic stability with long functional fatigue are required for eCE refrigeration applications. [20] Single crystalline FMSMAs such as Ni─Fe─Ga, [21,24] Ni─Fe─Ga-Co, [23,31] and Co─Ni─Ga [32] demonstrate superior reversibility and fatigue resistance over numerous stress cycles as compared with their bulk alloys. [22] The single crystals are difficult to prepare and handle due to the severe segregation, low growth rate, and elevated cost. [33-35] However, polycrystalline FMSMAs have a challenge as an elastocaloric refrigerant due to their brittle nature. Various strategies have been adopted to overcome the intrinsic brittleness in polycrystalline FMSMAs, for instance, ductility has been improved through texturing by reducing the intergranular constraints, [36-38] introducing the soft phase through post-annealing or composition design [22,39,40] and microalloying the rare-earth elements to refine the grain size. [17,41] It is also a feasible way to minimize the constraints of grain boundaries by introducing pores into bulk alloys. As a result, Ni─Mn─Ga foams significantly enhance magnetoelastic performances under multiple successive cycles. [42,43] Both open-pore foams (fabricated by replication casting) and near-net-shape SMAs (developed by additive manu...

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Section: The Martensite Transformation Temperatures (Ms Mf As and mentioning

confidence: 99%

Enhancing the Elastocaloric Cooling Stability of NiFeGa Alloys via Introducing Pores

et al. 2020

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“…Multicaloric effects in eCMs have been reported in magnetic fields (magnetic shape memory alloys) [54] or in electric fields [55]. A multicaloric cooling system can be realized by combining a mechanical load with a magnetic field or electric field and gives the possibility of increased solid refrigerant performance [56] or additional novel implementations of caloric cooling devices [57]. It has been shown that by applying a small magnetic field of 0.16 T, the required stress to induce the eCE can be reduced [38].…”

Section: Multicaloric Effectsmentioning

confidence: 99%

Future prospects for elastocaloric devices

Engelbrecht

2019

J. Phys. Energy

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Elastocaloric cooling (EC) is an alternative cooling technology that has been identified as having the potential to be more efficient than vapor compression systems. It is based on the elastocaloric effect, which is a change in temperature coupled to an applied uniaxial strain in materials such as NiTi alloys. Although EC is a promising technology for energy savings in the future, there are still challenges to be addressed if it is to be commercially successful. This paper gives a summary of the state of the art and recent developments in the area as well as perspectives on the most important challenges that must be met to make the technology commercial.

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“…5(a) (the details are shown in the Supplementary Material [48]). Because a larger fraction of the MST is involved to contribute to the inverse MCE in a higher field, a large reversible S m of 18.9 J kg −1 K −1 is achieved in a field change of 5 T at 274 K, which is comparable with the highest value reported in the Ni-Mn-X-based alloys [49]. Notably, a broad and reversible conventional MCE is also present in the higher temperature range that originates from the second-order magnetic transition of austenite.…”

Section: Resultsmentioning

confidence: 56%

“…For magnetic SMAs, the strong correlation between the hysteresis width and λ 2 has been widely reported in Ni-Mn-X-based Heusler alloys [15,16,27,33,49,55,56]. The determination of λ 2 relies on the crystalline structures of austenite and martensite and their lattice parameters [57].…”

Section: Resultsmentioning

confidence: 99%

“…From this tensor the eigenvalues are calculated: λ 1 = 0.9476(2), λ 2 = 1.0017 (5), and λ 3 = 1.0395(4) where λ 1 < λ 2 < λ 3 . Compared with other Heusler alloys [15,16,27,33,49,55,56], the sample with x = 0.3 exhibits a smaller value of |1 − λ 2 | = 1.7(5) × 10 −3 , which indicates a good geometric compatibility between the two phases. As a result, a small T hys can be obtained, in agreement with the model prediction.…”

Section: -6mentioning

confidence: 87%

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Reversible low-field magnetocaloric effect in Ni-Mn-In-based Heusler alloys

You

Huang

et al. 2019

Phys. Rev. Materials

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Ni-Mn-X (X = In, Sn, and Sb) based Heusler alloys show a strong potential for magnetic refrigeration owing to their large magnetocaloric effect (MCE) associated with first-order magnetostructural transition. However, the irreversibility of the MCE under low field change of 0-1 T directly hinders its application as an efficient magnetic coolant. In this work, we systematically investigate thermal and magnetic properties, crystalline structure and magnetocaloric performance in Ni 51−x Mn 33.4 In 15.6 V x alloys. With the introduction of V, a stable magnetostructural transition near room temperature is observed between martensite and austenite. An extremely small hysteresis of 2.3 K is achieved for the composition x = 0.3. Due to this optimization, the magneticfield induced structural transition is partially reversible under 0-1 T cycles, resulting in a reversible MCE. Both magnetic and calorimetric measurements consistently show that the largest value for the reversible magnetic entropy change can reach about 5.1 J kg −1 K −1 in a field change of 0-1 T. A considerable and reversible adiabatic temperature change of −1.2 K by the direct measurement is also observed under a field change of 0-1.1 T. Furthermore, the origin of this small hysteresis is discussed. Based on the lattice parameters, the transformation stretch tensor is calculated, which indicates an improved geometric compatibility between the two phases. Our work greatly improves the MCE performance of Ni-Mn-X-based alloys and make them suitable as realistic magnetic refrigeration materials.

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Simultaneously achieved large reversible elastocaloric and magnetocaloric effects and their coupling in a magnetic shape memory alloy

Cited by 132 publications

References 64 publications

Enhancing the Elastocaloric Cooling Stability of NiFeGa Alloys via Introducing Pores

Enhancing the Elastocaloric Cooling Stability of NiFeGa Alloys via Introducing Pores

Future prospects for elastocaloric devices

Reversible low-field magnetocaloric effect in Ni-Mn-In-based Heusler alloys

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