Change of electrical resistivity during phase transitions in NiMnSn-based shape memory alloy

Dağdelen, Fethi; Özay, Çetin; Ercan, E.; Emir, G.; Qader, İbrahim Nazem

doi:10.1007/s10973-021-10927-8

Cited by 8 publications

(2 citation statements)

References 43 publications

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“…The thermal and thermodynamic analysis has been applied to estimate other thermodynamic parameters as the irreversible entropy change, ΔS i [23], the elastic energy, E el [24] or the irreversible dissipated energy, W d [25]. The procedure and equations involved are described in [23][24][25][26]. All these parameters are higher in alloy with 2 at.% Pd and decreases with cycling.…”

Section: Thermal Analysismentioning

confidence: 99%

Effects of thermal cycling on the thermal and magnetic response of Ni–Mn–Sn–Pd alloys

Wederni,

Ipatov,

Khitouni

et al. 2023

J Therm Anal Calorim

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Magnetic refrigeration is an option to replace conventional refrigeration. There are many studies that analyze materials with magnetocaloric effect during the first cooling-heating cycle, without analyzing the influence of cycling (necessary to check its applicability). In this work, we proceed to analyze the crystallographic structure (X-Ray diffraction) and the thermal (differential scanning calorimetry) and thermomagnetic (PPMS cycles and ZFC–FH–FC scans) response after a hundred thermal cycles of two Heusler alloys, Ni49Mn36Sn14Pd1 and Ni48Mn36Sn14Pd2 (at.%), that have been produced by melt spinning as ribbon flakes. In order to check its stability from cycling, these ferromagnetic alloys have been subjected to a hundred of thermal cycles (heating/cooling to provoke the austenite to martensite reversible transformation. The comparison before and after cycling behavior allow us to state that the reduction of the crystallographic defects favors higher atomic order. Likewise, the thermodynamic parameters (entropy and enthalpy) and the magnetic response have been reduced at about 10–12%.

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Section: Thermal Analysismentioning

confidence: 99%

Effects of thermal cycling on the thermal and magnetic response of Ni–Mn–Sn–Pd alloys

Wederni,

Ipatov,

Khitouni

et al. 2023

J Therm Anal Calorim

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“…Ni 2 MnGa is a representative and the most investigated member of this class of materials, which shows a huge magnetic-field-induced strain (MFIS) below the austenite–martensite transformation, of the order of several percent, as evidenced by Ullakko et al [ 12 ]. However, the compound’s brittleness makes it difficult to be used in applications, and for this reason the search for new Heusler alloys that undergo an MT was extended comprising Co-Ni-Ga [ 13 , 14 , 15 ] and Ni-Mn-(Al, In, Sn) [ 16 , 17 , 18 , 19 , 20 , 21 ]. Ni-Fe-Ga alloys [ 22 , 23 , 24 , 25 , 26 ] have emerged as good candidates for replacing the brittle Ni-Mn-Ga in applications [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Processing Effects on the Martensitic Transformation and Related Properties in the Ni55Fe18Nd2Ga25 Ferromagnetic Shape Memory Alloy

et al. 2022

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The influence of processing on the martensitic transformation and related magnetic properties of the Ni55Fe18Nd2Ga25 ferromagnetic shape memory alloy, as bulk and ribbons prepared by the melt spinning method and subjected to different thermal treatments, is investigated. Structural, calorimetric, and magnetic characterizations are performed. Thermal treatment at 1173 K induces a decrease in both the Curie and the martensitic transformation temperatures, while a treatment at 673 K produces the structural ordering of the ribbons, hence an increase in TC. A maximum value of the magnetic entropy variation of −5.41 J/kgK was recorded at 310 K for the as quenched ribbons. The evaluation of the magnetoresistive effect shows a remarkable value of −13.5% at 275 K on the bulk sample, which is much higher than in the ribbons.

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Investigation of bio-corrosion behavior, structural and thermal properties of Ni20Ti50Sn30 high-temperature shape memory alloy

Balci

2024

J Therm Anal Calorim

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In this study, Ni20Ti50Sn30 (atomic %) sample was prepared using the arc melting method. Some thermodynamic parameters (phase transformation temperatures, PTT; enthalpy, ΔH; and phase transformation hysteresis, H) obtained from the phase transformations of the alloy were determined using differential scanning calorimetry (DSC). The sample exhibited high-temperature shape memory alloy (HTSMA) properties. X-ray (XRD) analysis was performed to determine the crystal structure properties at the alloy. The presence of B2, B19′, Ti2Ni, β-Ti, Ni3Sn4, TiNiSn and Ti3Sn phases was identified through X-ray analysis of the alloy. Scanning electron microscopy (SEM) was used to examine the pre- and post-corrosion surface morphologies of the sample, with EDX analysis being performed to reveal chemical structure determinations (matrix phases, precipitates and weathering zones). The presence of dendritic arms was observed, while martensite plates were absent in all SEM images. Particularly in the SEM image taken after corrosion, it was noted that the TiO2 layer placed on the surface of the matrix rich in Ti elements altered the surface morphology of the alloy. The presence of Ti and O elements in the post-corrosion EDX analysis confirmed the existence of this layer. Biocompatibility studies of the alloy were conducted using potentiodynamic corrosion tests and electrochemical impedance spectroscopy (EIS) methods. It was determined that the NiTiSn sample was in the excellent stability class according to corrosion standards.

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Change of electrical resistivity during phase transitions in NiMnSn-based shape memory alloy

Cited by 8 publications

References 43 publications

Effects of thermal cycling on the thermal and magnetic response of Ni–Mn–Sn–Pd alloys

Effects of thermal cycling on the thermal and magnetic response of Ni–Mn–Sn–Pd alloys

Processing Effects on the Martensitic Transformation and Related Properties in the Ni55Fe18Nd2Ga25 Ferromagnetic Shape Memory Alloy

Investigation of bio-corrosion behavior, structural and thermal properties of Ni20Ti50Sn30 high-temperature shape memory alloy

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