14% recoverable strain in Ni52.87Mn23.82Ga23.32 microwires

Ding, Zhiyi; Zhu, Jianguo; Zhang, Xinzhen; Liu, Dexing; Qi, Qingli; Zhang, Yong; Cong, Daoyong

doi:10.1088/1361-6463/aa5609

Cited by 20 publications

(15 citation statements)

References 27 publications

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“…Some authors present the data on martensitic transformation in glass-coated Ni-Mn-based glass-coated microwires. [103,117,166,[171][172][173] Some of them show even very high recovery strain >10%. [103,166,171] With the correct increase of the Mn content in the master alloy, we were able to get at least a few meters of correct composition.…”

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%

“…[103,117,166,[171][172][173] Some of them show even very high recovery strain >10%. [103,166,171] With the correct increase of the Mn content in the master alloy, we were able to get at least a few meters of correct composition. Fe 42 Mn 28.3 Ga 29.7 shows the structural transition in a wide temperature range (100-400 K) that enhances their working range compared to Ni-Fe-Ga.…”

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%

“…Ni-Mn-based microwires produced by melt extraction also showed superelastic and shape memory behavior. [101,[162][163][164][165][166] Since in many cases, we did not successfully observe the phase transitions in Ni-Mn-based microwires, we have studied Ni-Fe-Ga microwires that can be produced repeatedly with correct chemical composition and show phase transition within the technical range of temperature (200-400 K).…”

Section: Heusler Microwires With Shape Memory Effectmentioning

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 Microwires With Shape Memory Effectmentioning

confidence: 99%

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%

Section: Heusler Microwires With Shape Memory Effectmentioning

confidence: 99%

See 1 more Smart Citation

Heusler‐Based Cylindrical Micro‐ and Nanowires

Hennel

Varga

Frolova

et al. 2022

Physica Status Solidi (a)

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“…An 8 K elastocaloric temperature change induced by 1.3% transformation strain was recorded of a Ni 44 Mn 41 Sn 11 Cu 4 alloy [ 8 ] and a temperature change of 11.5 K was achieved in an all-d-metal Ni 35.5 Co 14.5 Mn 35 Ti 15 alloy with a low critical stress of 38 MPa [ 9 ]. Ultra-large tensile superelastic strains of 14.0% and 20.0% were achieved in Ni 52.87 Mn 23.82 Ga 23.32 [ 10 ] and Ni 50 Mn 31.4 Sn 9.6 Fe 9 microwires [ 11 ] fabricated by the Taylor–Ulitovsky method. The achievements of such novel properties have motivated active research on the Ni-Mn-based alloy system in the past two decades.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Effect of the γ Phase Precipitation on Martensitic Transformation and Mechanical Properties of Ni–Mn–Sn–Fe Heusler Alloys

et al. 2021

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Isothermal annealing of a eutectic dual phase Ni–Mn–Sn–Fe alloy was carried out to encourage grain growth and investigate the effects of grain size of the γ phase on the martensitic transformation behaviour and mechanical properties of the alloy. It is found that with the increase of the annealing time, the grain size and volume fraction of the γ phase both increased with the annealing time predominantly by the inter-diffusion of Fe and Sn elements between the γ phase and the Heusler matrix. The isothermal anneals resulted in the decrease of the e/a ratio and suppression of the martensitic transformation of the matrix phase. The fine γ phase microstructure with an average grain size of 0.31 μm showed higher fracture strength and ductility values by 28% and 77% compared to the coarse-grained counterpart with an average grain size of 3.31 μm. The fine dual phase microstructure shows a quasi-linear superelasticity of 4.2% and very small stress hysteresis during cyclic loading, while the coarse dual phase counterpart presents degraded superelasticity of 2.6% and large stress hysteresis. These findings indicate that grain size refinement of the γ phase is an effective approach in improving the mechanical and transformation properties of dual phase Heusler alloys.

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“…Meanwhile, the phase transformation temperature of the microwires is very close to RT. Usually, the alloy with the same composition presents martensitic state[43]. For the as-prepared Ni-Mn-Ga microwire, appropriate annealing treatment improves atomic order degree of alloy as well as phase transformation temperature (usually more than ten Kelvins)[44,45].…”

mentioning

confidence: 99%

Superlattice in austenitic Ni-Mn-Ga shape memory microwires

Ding

et al. 2019

Journal of Alloys and Compounds

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The link between microstructure evolution, micromodulated domain and the structure transformation of Ni-Mn-Ga shape memory microwires prepared with rapid solidification is studied systematically by TEM and HRTEM. Multiple microdomain structures are determined according to the corresponding diffraction spots. The domain structure with a periodic distortion is a kind of characteristic of premartensitic phase. When cooling below the martensitic transformation temperature, the austenitic phase transforms to modulated 5M martensite, and the sequence of phase transformation can finally be confirmed from austenite to premartensite to 5M martensite during cooling. The characterization of micromodulated domain and the structure characteristics of austenite at atomic scale provide comprehensive understanding on the martensitic phase transformation route.

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14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

Cited by 20 publications

References 27 publications

Heusler‐Based Cylindrical Micro‐ and Nanowires

Heusler‐Based Cylindrical Micro‐ and Nanowires

Grain Size Effect of the γ Phase Precipitation on Martensitic Transformation and Mechanical Properties of Ni–Mn–Sn–Fe Heusler Alloys

Superlattice in austenitic Ni-Mn-Ga shape memory microwires

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