Novel compositions of Heusler-based glass-coated microwires for practical applications using shape memory effect

Frolova, L. S.; Mino, J.; Ryba, T.; Gamcová, J.; Džubinská, Andrea; Reiffers, M.; Diko, P.; Kavečanský, V.; Milkovič, Ondrej; Kravčák, J.; Vargová, Zuzana; Varga, R.

doi:10.1016/j.jallcom.2018.03.035

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…[ 156 ] Moreover, it shows phase transition within the 240–290 K temperature range. [ 157 ] Since the composition of produced samples is very controllable in the case of Ni–Fe–Ga microwire, the transition temperature can be adjusted by adequately selected chemical composition. [ 75 ] It has been shown earlier that phase transition temperature is proportional to the number of valence electrons per formula unit e/a.…”

Section: Heusler Microwiresmentioning

confidence: 99%

“…It is also possible to replace the Ga for Sn, Sb to produce high‐quality (correct composition) Heusler microwire with well‐defined shape anisotropy. [ 157 ] Ni 2 FeSn glass‐coated microwire shows structural transition just below 300 K ( Figure ). However, the transition was irreversible and vanished with temperature cycling.…”

Section: Heusler Microwiresmentioning

confidence: 99%

“…Moreover, there are possibilities for the production of other shape memory [ 90 ] or superelastic [ 157 ] microwires. Nevertheless, it is necessary to take into account the interaction of glass with molten master alloys (that excludes alloys based on, e.g., aluminum), the too‐high melting temperature of master alloy (comparing to glass coating), or evaporation of elements from master alloy (e.g., Mn, Y) during the production of the microwire.…”

Section: Heusler Microwiresmentioning

confidence: 99%

“…Temperature dependence of magnetic moment for Ni 2 FeSn (up) and Ni 2 FeSb (down) Heusler microwires measured at a magnetic field of 50 Oe and 10 kOe (insets). Reproduced with permission [157]. Copyright 2018, Elsevier.…”

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confidence: 99%

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Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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Heusler alloys present a large group of binary, [1][2][3][4][5] ternary, [6][7][8][9][10] or quaternary [11][12][13][14] compounds with a wide variety of physical properties. [15][16][17][18] Thanks to their extensive tunability [19][20][21][22] based on their chemical composition, crystal, or electronic structure, [23][24][25][26][27][28][29] they attract interest in the fundamental and application approach. [30][31][32][33][34] Particularly, spin polarization, [33,35] superconductivity, [36][37][38][39] shape memory, [40][41][42][43][44][45] or magnetocaloric behavior [28,40,[46][47][48][49][50] have triggered significant interest in the experimental and theoretical perspective.Based on the chemical composition and the resulting properties, Heusler alloys, also known as full-Heusler alloys with the stoichiometry X 2 YZ, can be divided into several groups according to their physical properties. [51] Co 2 YZ-based Heusler can be considered the leading group of materials showing high spin polarization (P) or even half metallicity (P ¼ 100%). [52][53][54][55][56][57] However, theoretical and experimental studies point to the high sensitivity of spin polarization on the structural disorder. [58] Here, the L2 1 crystalline phase exhibits the highest structural ordering, essential for achieving the required spin polarization values. [59] In contrast, while the mutual exchange of the atoms on the Y-Z position (B2 disorder) has a low influence on the spin polarization values, the X-Y or X-Y-Z disorders (D0 3 or A2, respectively) may significantly decrease spin polarization values. [55,60,61] The presented disadvantage can be solved by a suitable chemical composition or a proper method of preparation of Heusler alloys. [62,63] Stoichiometric and off-stoichiometric Ni-Mn-Z- [64][65][66] and Ni-Fe-Z-based Heusler alloys [67][68][69] are well-known magnetocaloric, shape memory, or even magnetic shape memory materials. [70,71] The mentioned Heusler alloys undergo a structural transformation from a low-temperature martensitic phase to a high-temperature austenitic phase, [51,[64][65][66][72][73][74] which may significantly influence the magnetic entropy change ΔS M and the intensity of the magnetocaloric effect. [75,76] Additionally, Heusler alloys consist of cheap elements like Ni, Fe, Mn, Co, Ga, and In, and thus may be considered low-cost counterparts for typical magnetocaloric material based on Gd, Rh, or other rare-earth elements. [77][78][79][80][81] Another advantage of the Ni-Mn-Zand Ni-Fe-Z-based Heusler alloys consists in the tunability of their structural and magnetic properties. Depending on the

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Section: Heusler Microwiresmentioning

confidence: 99%

Section: Heusler Microwiresmentioning

confidence: 99%

Section: Heusler Microwiresmentioning

confidence: 99%

mentioning

confidence: 99%

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Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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“…Shape memory alloys (SMA) are functional materials which are predominantly used as actuators [1]. On the other hand, magnetic shape memory alloys (MSMA) may be used both as microactuators and displacement/force sensors or dampers [2,3]. In these alloys responsible for the shape memory effect is martensitic transformation (MT) in addition to the transition of magnetic order-disorder [4,5].…”

Section: Introductionmentioning

confidence: 99%

Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation

Gurău

Ţolea

et al. 2019

Materials

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Severe plastic deformation (SPD) is widely considered to be the most efficient process in obtaining ultrafine-grained bulk materials. The aim of this study is to examine the effects of the SPD process on Ni-Fe-Ga ferromagnetic shape memory alloys (FSMA). High-speed high-pressure torsion (HSHPT) was applied in the as-cast state. The exerted key parameters of deformation are described. Microstructural changes, including morphology that were the result of processing, were investigated by optical and scanning electron microscopy. Energy-dispersive X-ray spectroscopy was used to study the two-phase microstructure of the alloys. The influence of deformation on microstructural features, such as martensitic plates, intragranular γ phase precipitates, and grain boundaries’ dependence of the extent of deformation is disclosed by transmission electron microscopy. Moreover, the work brings to light the influence of deformation on the characteristics of martensitic transformation (MT). Vickers hardness measurements were carried out on disks obtained by SPD so as to correlate the hardness with the microstructure. The method represents a feasible alternative to obtain ultrafine-grained bulk Ni-Fe-Ga alloys.

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Martensitic Transformation and Magnetic Properties of Ni57Fe18Ga25 Shape Memory Alloy Subjected to Severe Plastic Deformation

Popescu

Gurău

et al. 2021

Trans Indian Inst Met

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Novel compositions of Heusler-based glass-coated microwires for practical applications using shape memory effect

Cited by 11 publications

References 9 publications

Heusler‐Based Cylindrical Micro‐ and Nanowires

Heusler‐Based Cylindrical Micro‐ and Nanowires

Structural Change in Ni-Fe-Ga Magnetic Shape Memory Alloys after Severe Plastic Deformation

Martensitic Transformation and Magnetic Properties of Ni57Fe18Ga25 Shape Memory Alloy Subjected to Severe Plastic Deformation

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