Evolution of microstructure and crystallographic texture of Ni-Mn-Ga melt-spun ribbons exhibiting 1.15% magnetic field-induced strain

Wójcik, Anna; Chulist, R.; Czaja, Paweł; Kowalczyk, M.; Zackiewicz, P.; Schell, Norbert; Maziarz, W.

doi:10.1016/j.actamat.2021.117237

Cited by 28 publications

(13 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 2 shows the transformation temperature and thermal hysteresis value of the samples from M-T curves at 0.1 kOe, it can be seen that the thermal hysteresis of the sample is not obvious at all. The phase change process for the three samples can be completed within a range of approximately 5 K. This result also compares very favorably with recently published papers [21].…”

supporting

confidence: 89%

“…This very large MFIS is mainly due to the rearrangement of martensite variants, but it is obtained primarily in single crystals. On the other hand, in order to decrease the induction of eddy currents and increase the frequency range of the Ni-Mn-Ga ferromagnetic alloys, the materials can be utilized in the form of a thin layer or ribbon [18][19][20][21]. There are two main driving mechanisms for magnetostrain in ferromagnetic shape memory alloys: one is the magnetic fieldinduced martensitic transformation of reorientation, typified by Ni-Mn-Ga alloys [20,22,23]; the other is the magnetic field-induced martensitic inverse phase transformation, typified by Ni-Mn-In and Ni-Mn-Sn alloys [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…Recent literature has reported the magnetoelastic properties and the MCE of Ni-Mn-Ga ribbons [20,21,33,34]. The goal was to enhance the comprehension of the deformation mechanisms of the material and to establish a connection between the small-scale mechanisms of shearing and the large-scale mechanical response.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large rotating magnetocaloric effects in polycrystalline Ni-Mn-Ga melt-spun ribbons

Chen,

Xie,

Huo

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

In this study, the different wheel speeds Ni53Mn23.5Ga23.5 alloy ribbons were prepared by melt-spun method. The morphology and crystal structure, martensitic phase transformation, magnetocrystalline anisotropy, in-situ technique magnetization observation and the magnetic refrigeration capacity resulting were tested. The ratio of the length to width for the columnar crystals is approximately 2.5:1.0 in the sample created at a wheel speed of 12 m/s, and it increases to 5:1 in the sample produced at a wheel speed of 18 m/s. It is found that a sample with 18 m/s has a large rotating magnetocaloric effect in polycrystalline alloys, with the results of 2 K with different directions. It can be designed as a working substance for rotary refrigeration machines that make full use of their anisotropic characteristics. The in situ atomic force microscope observation of the technological magnetisation has provided an important exploration for a better understanding of the magnetisation.

show abstract

supporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large rotating magnetocaloric effects in polycrystalline Ni-Mn-Ga melt-spun ribbons

Chen,

Xie,

Huo

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…In order to avoid the effect of texture on phase analysis, the samples were rotated 180° in one step around the pin long axis (ω-axis) perpendicular to the incident beam. The intensity was integrated over the whole Debye-Scherrer rings and the resulting patterns of the parent and martensitic phase were analyzed with the Rietveld refinement method using HighScore Plus software and the so-called continuous mode for synchrotron diffraction [ 21 , 22 ]. Such a procedure practically reduces the effect of crystallographic texture allowing very precise calculations of the phase volume fraction.…”

Section: Methodsmentioning

confidence: 99%

Phase Transformation Induced by High Pressure Torsion in the High-Entropy Alloy CrMnFeCoNi

et al. 2022

Self Cite

View full text Add to dashboard Cite

The forward and reverse phase transformation from face-centered cubic (fcc) to hexagonal close-packed (hcp) in the equiatomic high-entropy alloy (HEA) CrMnFeCoNi has been investigated with diffraction of high-energy synchrotron radiation. The forward transformation has been induced by high pressure torsion at room and liquid nitrogen temperature by applying different hydrostatic pressures and large shear strains. The volume fraction of hcp phase has been determined by Rietveld analysis after pressure release and heating-up to room temperature as a function of hydrostatic pressure. It increases with pressure and decreasing temperature. Depending on temperature, a certain pressure is necessary to induce the phase transformation. In addition, the onset pressure depends on hydrostaticity; it is lowered by shear stresses. The reverse transformation evolves over a long period of time at ambient conditions due to the destabilization of the hcp phase. The effect of the phase transformation on the microstructure and texture development and corresponding microhardness of the HEA at room temperature is demonstrated. The phase transformation leads to an inhomogeneous microstructure, weakening of the shear texture, and a surprising hardness anomaly. Reasons for the hardness anomaly are discussed in detail.

show abstract

“…Diffraction patterns for the phase analysis were registered in the so-called continuous mode using the area Mar345 Image Plate detector. The experimental setup for phase analyses included rotation by 180 degrees about the ω-axis to avoid the effect of crystallographic texture [33,34]. Such a procedure significantly improves grain statistics by providing quasi-powder diffraction.…”

Section: Methodsmentioning

confidence: 99%

Formation and Thermal Stability of the ω-Phase in Ti–Nb and Ti–Mo Alloys Subjected to HPT

et al. 2022

Self Cite

View full text Add to dashboard Cite

This paper discusses the features of ω-phase formation and its thermal stability depending on the phase composition, alloying element and the grain size of the initial microstructure of Ti–Nb and Ti–Mo alloys subjected to high-pressure torsion (HPT) deformation. In the case of two-phase Ti–3wt.% Nb and Ti–20wt.% Nb alloys with different volume fractions of α- and β-phases, a complete β→ω phase transformation and partial α→ω transformation were found. The dependence of the α→ω transformation on the concentration of the alloying element was determined: the greater content of Nb in the α-phase, the lower the amount of ω-phase that was formed from it. In the case of single-phase Ti–Mo alloys, it was found that the amount of ω-phase formed from the coarse-grained β-phase of the Ti–18wt.% Mo alloy was less than the amount of the ω-phase formed from the fine α′-martensite of the Ti–2wt.% Mo alloy. This was despite the fact that the ω-phase is easier to form from the β-phase than from the α- or α′-phase. It is possible that the grain size of the microstructure also affected the phase transformation, namely, the fine martensitic plates more easily gain deformation and overcome the critical shear stresses necessary for the phase transformation. It was also found that the thermal stability of the ω-phase in the Ti–Nb and Ti–Mo alloys increased with the increasing concentration of Nb or Mo.

show abstract

Evolution of microstructure and crystallographic texture of Ni-Mn-Ga melt-spun ribbons exhibiting 1.15% magnetic field-induced strain

Cited by 28 publications

References 56 publications

Large rotating magnetocaloric effects in polycrystalline Ni-Mn-Ga melt-spun ribbons

Large rotating magnetocaloric effects in polycrystalline Ni-Mn-Ga melt-spun ribbons

Phase Transformation Induced by High Pressure Torsion in the High-Entropy Alloy CrMnFeCoNi

Formation and Thermal Stability of the ω-Phase in Ti–Nb and Ti–Mo Alloys Subjected to HPT

Contact Info

Product

Resources

About