Effects of Co Additions on the Martensitic Transformation and Magnetic Properties of Ni–Mn–Sn Shape Memory Alloys

Bachaga, T.; Daly, Rakia; Suñol, J.J.; Saurina, J.; Escoda, L.; Legarreta, Lorena González; Hernando, B.; Khitouni, Mohamed

doi:10.1007/s10948-015-3100-z

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…between the average number of valence electrons per atom and the martensite start temperature Ms; it increases when the value (e/a) increases. [24][25][26][27][28][29] Similar behavior was found in this study, where the Ms temperature decreases from 431 to 260 K when e/a varies from 8.02 to 7.94 for In0.12 and In0.14, respectively. Hence, the control (e/a) determines the transformation temperatures range in this type of alloys.…”

Section: Thermal and Thermodynamic Analysissupporting

confidence: 78%

Thermal and structural analysis of Ni50Mn50−xInx shape memory alloys

Ameur

Chemingui

Bachaga

et al. 2019

J Therm Anal Calorim

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Due to the high cost and low martensitic transformation temperature of Gallium as the basis for the most extensively studied Heusler alloys, the search for Ga-free alloys has been recently undertaken, particularly by introducing In, Sn or Sb. Therefore, three-shape memory alloys were obtained by rapid solidification: Ni0.5Mn0.5-xInx (x=0.12, 0.13 and 0.14).The thermal and structural analyses were performed by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and electron microscopy scanning (SEM), which were applied to determine the martensite transformation. The structural transformations were found to be of austenitic-martensitic character, with the transformation temperatures decreasing with the increase of In content. The austenite state was proven to have a cubic L21 structure and the martensite was found to possess a monoclinic 10M structure. The obtained results have revealed that the control of the valence electron by atom (e/a) determines the functional properties displayed by these alloys near room-temperature and it is possible to develop alloys that can be candidates in a variety of applications such as sensors and actuators. Likewise, the entropy and enthalpy change linked to transformation are lower for Ni50Mn36In14 alloy.

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Section: Thermal and Thermodynamic Analysissupporting

confidence: 78%

Thermal and structural analysis of Ni50Mn50−xInx shape memory alloys

Ameur

Chemingui

Bachaga

et al. 2019

J Therm Anal Calorim

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“…According to previous studies, there is a linear correlation between the Re/a values and Ms for the FSMAs [ 24 , 25 ]. For all alloy samples in the present study, the calculated Re/a values, together with the relation between Re/a and Ms, are shown in Figure 7 .…”

Section: Discussionmentioning

confidence: 76%

“…On the other hand, higher martensitic transformation temperatures have been obtained for high-entropy alloys. This is because the multielement in high-entropy alloy has significant changes in valence electrons per atom and serious effects of atomic size [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Magnetic Field-Induced Strain of a Ni-Mn-Ga-Co-Gd High-Entropy Alloy

Bao

et al. 2021

Materials

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The effect of a high-entropy design on martensitic transformation and magnetic field-induced strain has been investigated in the present study for Ni-Mn-Ga-Co-Gd ferromagnetic shape-memory alloys. The purpose was to increase the martensitic transition temperature, as well as the magnetic field-induced strain, of these materials. The results show that there is a co-existence of β, γ, and martensite phases in the microstructure of the alloy samples. Additionally, the martensitic transformation temperature shows a markedly increasing trend for these high-entropy samples, with the largest value being approximately 500 °C. The morphology of the martensite exhibits typical twin characteristics of type L10. Moreover, the magnetic field-induced strain shows an increasing trend, which is caused by the driving force of the twin martensite re-arrangement strengthening.

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“…As reported in the literature [29], a linear relationship is expected between the structural phase transition and e/a value. Thereby, e/a and Ms have the same tendency and increase monotonically [30]. The higher the e/a, the higher the temperatures of the structural transformation.…”

Section: Thermal Analysismentioning

confidence: 69%

Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys

et al. 2020

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Martensitic transition and magnetic response of Ni50−x Pdx,y Mn36 Sn14−y (x = 0, 1, 2 and y = 0, 1) Heusler alloys were analysed. The crystalline structure of each composition was solved by X-ray diffraction pattern fitting. For x = 1 and 2, the L21 austenite structure is formed and, for y = 1, the crystallographic phase is a modulated martensitic structure. From differential scanning calorimetry scans, we determine characteristic transformation temperatures and the entropy/enthalpy changes. The temperatures of the structural transformation increase with the addition of Pd to replace Ni or Sn, whereas the austenitic Curie temperature remains almost unvarying. In addition, the magneto-structural transition, investigated by magnetic measurements, is adjusted by suitable Pd doping in the alloys. The peak value of the magnetic entropy changes reached 4.5 J/(kg K) for Ni50Mn36Sn13Pd1 (external field: 50 kOe).

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Effects of Co Additions on the Martensitic Transformation and Magnetic Properties of Ni–Mn–Sn Shape Memory Alloys

Cited by 23 publications

References 26 publications

Thermal and structural analysis of Ni50Mn50−xInx shape memory alloys

Thermal and structural analysis of Ni50Mn50−xInx shape memory alloys

Microstructure and Magnetic Field-Induced Strain of a Ni-Mn-Ga-Co-Gd High-Entropy Alloy

Martensitic Transformation, Thermal Analysis and Magnetocaloric Properties of Ni-Mn-Sn-Pd Alloys

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