Phase transitions and magnetocaloric effect of Ni1.7Co0.3Mn1+xAl1−x Heusler alloys

Kim, Yongdeok; Han, Won Bae; Kim, Hee‐Soo; An, Hyeun Hwan; Yoon, Chong Seung

doi:10.1016/j.jallcom.2012.12.163

Cited by 19 publications

(17 citation statements)

References 34 publications

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“…However, the decreasing tendency enhances when below the T C , which is similar to the case of NiCoMnIn alloys [18]. The tendencies, as well as the values of the transition temperatures are consistent with former reports [23,[27][28][29], as shown in Figure 5. It should be also pointed out that, for solution-treated NiMnAl ternary alloys, the parent phase with a B2 structure is antiferromagnetic and the T C does not exist [28].…”

Section: Magnetization Measurements In Pulsed Magnetic Fieldsupporting

confidence: 90%

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The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Ito

Tokunaga

et al. 2013

Metals

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In this report, we present findings of systematic research on NiCoMnAl alloys, with the purpose of acquiring a higher thermal transformation arrest temperature (T A ). By systematic research, T A in the NiCoMnAl alloy systems was raised up to 190 K, compared to the highest T A of 130 K in NiCoMnIn. For a selected alloy of Ni 40 Co 10 Mn 33 Al 17 , magnetization measurements were performed under a pulsed high magnetic field, and the critical magnetic field-temperature phase diagram was determined. The magnetic phase diagram for Ni 50−x Co x Mn 50−y Al y was also established. Moreover, from the discussion that the formerly called "kinetic arrest phenomenon" has both thermodynamic and kinetic factors, we suggest a terminology change to the "thermal transformation arrest phenomenon".

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Section: Magnetization Measurements In Pulsed Magnetic Fieldsupporting

confidence: 90%

“…Martensitic transformation temperatures, T Ms , Curie temperature, T C , and the thermal transformation arrest temperature, T A , are indicated. Transformation temperatures reported for NiMn [27], Ni 50 Mn 50−y Al y [28] and Ni 50−x Co x Mn 50−y Al y [23,29] are also shown in the figure.…”

Section: Magnetization Measurements In Pulsed Magnetic Fieldmentioning

confidence: 93%

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Ito

Tokunaga

et al. 2013

Metals

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“…Among these alloy systems, because of the low cost, several groups have also focused on the Ni-Co-Mn-Al system. To develop magnetocaloric materials, attempts have been made to evaluate isothermal entropy change [9] as well as adiabatic temperature change [10]. Other groups have also investigated the properties of sputtered film [11] and melt-spun ribbon samples [12].…”

Section: Introductionmentioning

confidence: 99%

“…Some systematic work has been performed on Ni-Mn-In-X alloys [5,14,[20][21][22][23], Ni-Mn-Sn-X alloys [22,24] and Ni-Mn-Ga-X alloys [25,26]. However, for the Ni-Co-Mn-Al system, there are currently only indirect calculations for a single alloy [15] and estimations deduced from the Maxwell equation [9]. Very recently, we reported the pseudo-binary magnetic phase diagram of the Co x Al y alloys [16].…”

Section: Introductionmentioning

confidence: 99%

Entropy Change during Martensitic Transformation in Ni50−xCoxMn50−yAly Metamagnetic Shape Memory Alloys

Ito

Kanomata

et al. 2014

Entropy

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Specific heat was systematically measured by the heat flow method in Ni 50−x Co x Mn 50−y Al y metamagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic transformation and ferromagnetic-paramagnetic transition for the parent phase were directly observed via the specific heat measurements. On the basis of the experimental results, the entropy change was estimated and it was found to show an abrupt decrease below the Curie temperature. The results were found to be consistent with those of earlier studies on Ni-Co-Mn-Al alloys.

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“…m is expressed as [58] was subjected to magnetization (MH) measurements, where a condenser bank-powered magnet [131] was used. Comparison of the applied magnetic fields for Ni 45 Co 5 Mn 36.7 In 13.3 alloy, which is half of the magnetic field hysteresis, between results from steady [58] and pulsed magnetic fields. The black solid line is a fitting curve based on Eq.…”

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

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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.

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Phase transitions and magnetocaloric effect of Ni1.7Co0.3Mn1+xAl1−x Heusler alloys

Cited by 19 publications

References 34 publications

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Entropy Change during Martensitic Transformation in Ni50−xCoxMn50−yAly Metamagnetic Shape Memory Alloys

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

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