An interpretation of the kinetics of martensitic transformation in a Ni45Co5Mn36.5In13.5 alloy

Fukuda, Takashi; Kakeshita, Tomoyuki; Lee, Yong-hee

doi:10.1016/j.actamat.2014.08.018

Cited by 24 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have measured C for one of the studied Ni-Mn-In samples (sample D) by using a modulated differential scanning calorimeter (Q-2000) from TA instruments. Results are in good agreement with those reported for other magnetic shape memory alloys [28,38,19,39]. We have combined these data with the entropy vs. temperature curves obtained at different values of hydrostatic pressure and magnetic field to compute the pressure induced and magnetic field induced adiabatic temperature changes shown in figure 7.…”

Section: Adiabatic Temperature Changessupporting

confidence: 74%

“…In this case a good approximation is to assume that beyond the transition region C can be considered to be independent from the external field [38]. Furthermore, for magnetic shape memory alloys, the specific heat in both martensite and austenite does not significantly depend on composition [38,19,39]. We have measured C for one of the studied Ni-Mn-In samples (sample D) by using a modulated differential scanning calorimeter (Q-2000) from TA instruments.…”

Section: Adiabatic Temperature Changesmentioning

confidence: 99%

See 1 more Smart Citation

Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

et al. 2015

View full text Add to dashboard Cite

We report on the barocaloric and magnetocaloric effects in a series of low-hysteresis Ni-Mn-In magnetic shape memory alloys. We show that the behaviour exhibited by several quantities that characterise these caloric effects (isothermal entropy change, adiabatic temperature change and refrigerant capacity) can be rationalised in terms of the relative distance between the Curie point of the austenite and the martensitic transition temperature. It is found that the two caloric effects exhibit opposite trends. The behaviour of the barocaloric effect parallels that exhibited by the transition entropy change, thereby showing larger values for weakly magnetic samples. Regarding the magnetocaloric effect, the entropy change is maximum for those samples transforming martensitically close to the Curie point of the austenite. Such a maximum value does not correspond to the maximum adiabatic temperature change, and samples with martensitic transition slightly below the Curie point do have larger temperature changes as a result of the strongest sensitivity of the transition to the magnetic field.

show abstract

Section: Adiabatic Temperature Changessupporting

confidence: 74%

Section: Adiabatic Temperature Changesmentioning

confidence: 99%

Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Recently, experiments on Ni 45 Co 5 Mn 36.5 In 13.5 suggests that no collapse in the entropy difference between austenite and martensite can be observed above 0K [46]. Unfortunately, the entropy calculations presented in [46] compare thermodynamically inequivalent heat capacity measurements between super spin glass martensite under 0T and ferromagnetic austenite under 3T. The magnetic contribution to the austenite and martensite entropies is significant and care must be taken when calculating equilibrium conditions.…”

Section: Thermodynamic Arrestmentioning

confidence: 99%

Multiple ferroic glasses via ordering

Monroe

Raymond

et al. 2015

Acta Materialia

View full text Add to dashboard Cite

Structural glasses are characterized by the loss of long-range translational and rotational symmetry. In the last two decades, however, it has been discovered that materials that exhibit ferroic (ferromagnetic, ferroelectric and ferroelastic) phase transformations may also exhibit glassy behavior, in which the ferroic degrees of freedom (magnetization, polarization, strain) exhibit a loss of long-range translational symmetry. A consequence of this loss of longrange symmetry is the suppression of the ferroic phase transitions. Moreover, these unique glassy systems exhibit dynamic and thermodynamic behavior analogous to regular structural glasses.Conventionally, the onset of glassy behavior is brought about by the introduction of spatial heterogeneities, typically originating from point defects, particularly in the case of strain glasses.Here, we demonstrate, for the first time, that configurational order/disorder in a single ferromagnetic alloy (Ni 45 Co 5 Mn 36.6 In 13.4 ) can be used to stabilize both strain and magnetic glasses. The control of the degree of configurational order--through simple heat treatment schedules--, and simultaneous application of stress and magnetic field enabled us to observe a Kauzmman point, that is, the collapse of the entropy difference between a crystalline and a glassy phase. Systematic investigation of the transformation behavior in this system as a function of heat treatment enabled us to observe four kinds of solid-solid phase transitions (ferromagnetic-paramagnetic, martensitic transformation, strain and magnetic glass) in a single composition. The alloy investigated can be used to further elucidate the nature of ferroic glass transitions and their coupling.

show abstract

“…On the other hand, based on the nucleation model [124], Fukuda et al have shown that their experimental observations of time-temperature-transformation (TTT) diagrams can be well explained [125]. Recently, our group also proposed the use of a model based on Seeger's model [126,127].…”

Section: Kinetics Of Ni-mn-based Magnetic Shape Memory Alloysmentioning

confidence: 99%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. We herein present a review of recent thermodynamic and kinetic studies on Ni-Mn-based magnetic shape memory alloys along with some new data supporting the kinetic discussion. Magnetic phase diagrams and Clausius-Clapeyron relationships are mainly discussed for Ni-Mn-Ga and Ni-Mn-In systems. For the kinetics, a phenomenological model based on Seeger's model is used to describe the temperature dependence of magnetic field hysteresis, as well as the change of hysteresis under different sweeping rates of magnetic fields.

show abstract

An interpretation of the kinetics of martensitic transformation in a Ni45Co5Mn36.5In13.5 alloy

Cited by 24 publications

References 25 publications

Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

Tailoring barocaloric and magnetocaloric properties in low-hysteresis magnetic shape memory alloys

Multiple ferroic glasses via ordering

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Contact Info

Product

Resources

About