Effect of pressure on the phase stability and magnetostructural transitions in nickel-rich NiFeGa ribbons

Manchón-Gordón, A.F.; Ipus, J.J.; Kowalczyk, M.; Wójcik, Anna; Blázquez, J.S.; Conde, C.F.; Maziarz, W.; Švec, P.; Kulik, T.; Conde, A.

doi:10.1016/j.jallcom.2020.156092

Cited by 8 publications

(15 citation statements)

References 31 publications

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“…This is in line with our present data, although the range of applied pressure is generally increasing the pressure from tens of MPa to GPa, whereas we decrease the pressure down to 10 −5 mbar. Unlike the previous permanent effects found in the ribbon samples due to high pressure application [23], which produced an intermartensitc transformation from the modulated to the non-modulated L1 0 structure, the effects of submitting the sample to vacuum are reversible. Both the modulated 14M phase and transition temperature are recovered once ambient atmosphere is recuperated.…”

Section: Resultsmentioning

confidence: 63%

“…However, increasing the maximum temperature in successive cycles clearly shifts the transition to lower temperatures, as shown in ref. [23]. All these features, along with the pressure dependence described above, point to a strong influence on the transition of the strain fields present in each sample piece of ribbon, which are somehow relaxed after heating.…”

Section: Resultsmentioning

confidence: 77%

“…Therefore, pressure or magnetic field application do affect the transition characteristics. In fact, our previous results on melt-spun samples of this composition show the high sensitiveness of the transformation to mechanical treatments at room temperature, consisting of axial pressure application in the range of~125 MPa [23]. After the load was removed, a permanent effect on the transition is observed, with a progressive reduction in the enthalpy of the transformation as the applied pressure increased from 25 to 125 MPa.…”

Section: Introductionmentioning

confidence: 80%

“…About 30 g of the ingot were melted in a quartz tube under argon atmosphere and ejected onto a rotation wheel with a surface velocity of 25 m/s. Microstructural characterization and stability of Ni 55 Fe 19 Ga 26 melt spun Heusler alloy can be found elsewhere [23].…”

Section: Methodsmentioning

confidence: 99%

“…Finally, it is also found that martensitic transition in melt-spun Ni 55 Fe 19 Ga 26 is very sensitive to thermal treatments. The transformation shifts to lower temperatures as the samples become previously heated up to higher temperatures (in the range 473 to 623 K, below the temperature of formation of the γ phase) [23].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Analysis of the Transformation from 14M Martensite to L21 Austenite in Ni-Fe-Ga Melt Spun Ribbons

Manchón-Gordón

López-Martín

Ipus

et al. 2021

Metals

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In this study, the non-isothermal kinetics of the martensitic transition from 14M modulated martensite to austenite phase in Ni55Fe19Ga26 ribbons obtained by melt-spinning has been analyzed. The proximity of the martensitic transition to room temperature makes it very sensitive to pressure and subtle differences for different pieces of the ribbon (ascribed to stresses stored in the ribbon during its rapid solidification process). Despite the dispersion in the characteristic parameters of the transition, a general behavior is observed with a decreasing activation energy as the heating rate increases due to the nucleation driven character of the transition. It has been shown that a first-order autocatalysis can describe the temperature evolution of the austenite fraction using only two experimental temperatures. Predicted curves are in good agreement with experimental data.

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Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Kinetic Analysis of the Transformation from 14M Martensite to L21 Austenite in Ni-Fe-Ga Melt Spun Ribbons

Manchón-Gordón

López-Martín

Ipus

et al. 2021

Metals

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Thermal arrest analysis of the reverse martensitic transformation in a Ni55Fe19Ga26 Heusler alloy obtained by melt-spinning

Vidal-Crespo

Manchón-Gordón

Blázquez

et al. 2022

J Therm Anal Calorim

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Ni55Fe19Ga26 ribbons obtained by melt-spinning technique exhibit a martensitic transformation from L21 cubic austenite phase to 14 M martensite phase above room temperature. We have taken advantage of the existence of thermal hysteresis of the martensitic phase transition (~ 11 K) to analyze the effect of isothermal treatments on the reverse martensitic transformation, which has been analyzed by means of interrupted heating using differential scanning calorimetry. The experimental findings clearly indicate a time-depending effect in the martensitic transformation at temperatures between the austenite start and finish temperatures. Moreover, it has been observed that two successive martensitic transformations take place after the isothermal arrest was performed.

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Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

Martín-Olalla,

Vidal-Crespo,

Romero

et al. 2024

J Therm Anal Calorim

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We study the thermal properties of a bulk $$\hbox {Ni}_{55}\hbox {Fe}_{19}\hbox {Ga}_{26}$$ Ni 55 Fe 19 Ga 26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates ($$\sim {1}\,\hbox {K h}^{-1}$$ ∼ 1 K h - 1 ), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14 M modulated structure in the martensite phase. In ultraslow experiments ($${40}\,\hbox {mK h}^{-1}$$ 40 mK h - 1 ), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14 M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $$p(u)\propto u^{-\varepsilon }\exp (-u/\xi )$$ p ( u ) ∝ u - ε exp ( - u / ξ ) where $$\varepsilon \sim 2$$ ε ∼ 2 and damping energies $$\xi ={370}{\upmu {\rm J}}$$ ξ = 370 μ J (direct) and $$\xi ={27}{\upmu {\rm J}}$$ ξ = 27 μ J (reverse) that characterize the asymmetry of the transformation.

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Effect of pressure on the phase stability and magnetostructural transitions in nickel-rich NiFeGa ribbons

Cited by 8 publications

References 31 publications

Kinetic Analysis of the Transformation from 14M Martensite to L21 Austenite in Ni-Fe-Ga Melt Spun Ribbons

Kinetic Analysis of the Transformation from 14M Martensite to L21 Austenite in Ni-Fe-Ga Melt Spun Ribbons

Thermal arrest analysis of the reverse martensitic transformation in a Ni55Fe19Ga26 Heusler alloy obtained by melt-spinning

Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

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