Martensitic transformations and magnetocaloric effect in Sn-doped NiMnIn shape memory alloy

Dwevedi, Sandhya; Tiwari, Brajesh

doi:10.1016/j.jallcom.2012.06.057

Cited by 26 publications

(3 citation statements)

References 20 publications

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“…Nonetheless, in consistence with theoretical predictions, more experimental studies on, e.g., the quinary Ni 45 Co 5 Mn 40 In x Sn 10−x alloy confirmed an increase of the T MT and a decrease of the Curie temperature of austenite ( T A C ) with increasing In content [21]. Simultaneously partial substitution (8 at.%) of In by Sn in the Ni 50 Mn 34 Sn 18 alloy led to a decrease in the unit cell volume while elevating the T MT and the T A C temperatures in agreement with the chemical pressure effect [22]. Therefore, in view of the many contradictory results and in order to bring more consistency to experimental evidence and hence shed more light the physical basis behind the e/a and v c influences, we have systematically examined the evolution of structure, characteristic transformation temperatures, and magnetic and magnetocaloric properties of the Ni 48 Mn 39.5 Sn 12.5−x In x (x = 2, 4, 6) alloys.…”

Section: Introductionsupporting

confidence: 69%

Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys

Czaja

Przewoźnik

Hawełek

et al. 2021

Journal of Materials Research

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Martensitic transformation, magnetic entropy, and direct adiabatic temperature changes in Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic Heusler bulk and grain-constrained ribbon alloys were studied. All alloys showed a typical L21 structure in austenite and the 4O structure in martensite. Their relative volume contributions changed depending on In content. With increasing In concentration, the martensitic transformation temperature increased, whereas the Curie temperature of austenite decreased. The magnetic entropy change under magnetic field of 5 T attained maximum of 20 J/kgK in the bulk and 14.4 J/kgK in the ribbon alloys with the Ni48Mn39.5Sn8.5In4 nominal composition. The corresponding adiabatic temperature change under 1.7 T yielded 1.3 K for the Ni48Mn39.5Sn8.5In4 bulk alloy. Despite grain confinement, melt spinning was found to stabilize martensite phase. Changes observed were discussed with relation to strengthened covalency imposed by In substitution. Graphic abstract

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Section: Introductionsupporting

confidence: 69%

Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys

Czaja

Przewoźnik

Hawełek

et al. 2021

Journal of Materials Research

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“…8. Noteworthily, the RC eff of the present Co6 alloy reaches 223 J/kg, which is significantly larger than those of the stoichiometric Ni-Mn-based alloys 18,45,76,77,79,81–84 and is comparable to those of some Co-doped Mn-rich Ni-Mn-based compounds 1,63,78–80,83 . Besides, the achieved RC eff is also comparable to those rare-earth containing La(FeSi) 13 -based 72,73 and Gd 5 (SiGe) 4 -based 74,75 compounds.…”

Section: Resultsmentioning

confidence: 57%

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Zhang

Qian

et al. 2018

Sci Rep

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High magnetocaloric refrigeration performance requires large magnetic entropy change ΔSM and broad working temperature span ΔTFWHM. A fourth element doping of Co in ternary Ni-Mn-Sn alloy may significantly enhance the saturation magnetization of the alloy and thus enhance the ΔSM. Here, the effects of Co-doping on the martensite transformation, magnetic properties and magnetocaloric effects (MCE) of quaternary Ni47−xMn43Sn10Cox (x = 0, 6, 11) alloys were investigated. The martensite transformation temperatures decrease while austenite Curie point increases with Co content increasing to x = 6 and 11, thus broadening the temperature window for a high magnetization austenite (13.5, 91.7 and 109.1 A·m2/kg for x = 0, 6 and 11, respectively). Two successive magnetostructural transformations (A → 10 M and A → 10 M + 6 M) occur in the alloy x = 6, which are responsible for the giant magnetic entropy change ΔSM = 29.5 J/kg·K, wide working temperature span ΔTFWHM = 14 K and large effective refrigeration capacity RCeff = 232 J/kg under a magnetic field of 5.0 T. These results suggest that Ni40.6Mn43.3Sn10.0Co6.1 alloy may act as a potential solid-state magnetic refrigerant working at room temperature.

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“…So, many researchers have tried to induce ductility and toughness by adding fourth element like ( Fe, Co, etc ) into the composition [4,5] or replacing Mn with Fe or Co [6,7]. Other Ni-Mn-Ga like systems Ni-Mn-Z (Z = In, Sn, Al) [8][9][10][11] also have been reported showing shape memory effects. The enhancement of ductility and toughness of the heusler alloy has been a positive improvement of Fe-addition.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Phase Evolution of Ni<sub>2</sub>FeGa Heusler Alloy Extended to Different Degrees of Undercooling

Nath

Phanikumar

2014

MSF

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The Ni2FeGa Heusler alloy is synthesized by arc melting in argon atmosphere. It shows two phase microstructure, γ-phase ( disordered fcc ) and Austenite ( ordered bcc, L21 ). Phase identification and microstructural characterization were carried out using XRD, SEM and TEM. Solidification at various undercoolings upto 215 °C was performed using flux undercooling technique. B2O3 was used as the flux that provides an inert atmosphere and isolates the molten pool from the quartz tube. The solidified microstructure of the undercooled samples were analyzed and the result indicates γ-phase to be the primary phase to form. The samples are also textured. XRD patterns indicate different texture at different undercoolings. Possible mechanisms for such changes will be discussed. The competitive nucleation mechanism can not also be ruled out as the SEM micrographs show the globular morphology of γ-phase likely due to defragmentation of primary dendrites. Thermal analysis by DSC shows incongruent melting of Ni2FeGa Heusler alloy which strengthen the argument of poor nucleation ability of L21 ordered intermetallic austenite phase as compared to primary γ-phase. Up to achieved undercooling limits, γ-phase forms as the primary phase competitively with the L21 ordered phase. Studies indicate that competitive nucleation mechanism is a likely mechanism to explain the phase selection.

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Martensitic transformations and magnetocaloric effect in Sn-doped NiMnIn shape memory alloy

Cited by 26 publications

References 20 publications

Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys

Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Microstructure and Phase Evolution of Ni<sub>2</sub>FeGa Heusler Alloy Extended to Different Degrees of Undercooling

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