Entropy change and effect of magnetic field on martensitic transformation in a metamagnetic Ni–Co–Mn–In shape memory alloy

Kustov, S.; Corró, M.L.; Pons, J.; Cesari, E.

doi:10.1063/1.3130229

Cited by 129 publications

(81 citation statements)

References 15 publications

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“…Reports of a similar tendency of ΔS can be found in other ternary NiMn-In alloys [53,54]. The decrease of ΔS below T C,P by direct measurements can also be found in Sb-doped [55] and Co-doped [56] quaternary systems, as well as in the Ni 50−x Co x Mn 50−y Al y system [57]. This common tendency is considered to be the thermodynamic cause of the "thermal transformation arrest phenomenon" [58,59], where the martensitic transformation is interrupted at a certain temperature during the cooling process.…”

Section: Entropy Change During Martensitic Transformationsupporting

confidence: 56%

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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Section: Entropy Change During Martensitic Transformationsupporting

confidence: 56%

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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“…Comparable results are known in Ni-rich Ni-and Mn-based Heusler alloys [19,20]. A similar feature has been found for Ni-Co-Mn-In alloys and is attributed to the modification of the atomic sites (order-disorder), the Mn-Mn distances and the Mn-Mn exchange coupling [47][48][49][50]. Additionally, based on this, the Fermi surface and the Brillouin zone boundary can be affected [50][51][52][53].…”

Section: Magnetic Propertiessupporting

confidence: 55%

Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles

Fichtner

Wang

Levin

et al. 2015

Metals

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We report on the effects of annealing on the martensitic phase transformation in the Ni-based Heusler system: Mn 50 Ni 40 Sn 10 and Mn 50 Ni 41 Sn 9 powder and Co 50 Ni 21 Ga 32 nanoparticles. For the powdered Mn 50 Ni 40 Sn 10 and Mn 50 Ni 41 Sn 9 alloys, structural and magnetic measurements reveal that post-annealing decreases the martensitic transformation temperatures and increases the transition hysteresis. This might be associated with a release of stress in the Mn 50 Ni 40 Sn 10 and Mn 50 Ni 41 Sn 9 alloys during the annealing process. However, in the case of Co 50 Ni 21 Ga 32 nanoparticles, a reverse phenomenon is observed. X-ray diffraction analysis results reveal that the as-prepared Co 50 Ni 21 Ga 32 nanoparticles do not show a martensitic phase at room temperature. Post-annealing followed by ice quenching, however, is found to trigger the formation of the martensitic phase. The presence of the martensitic transition is attributed to annealing-induced particle growth and the stress introduced during quenching.

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“…T -Ap), the greater the magnetic contribution to the entropy change, hence the overall transformation entropy diminishes, as it has been observed for many different metamagnetic alloys [14,15,[24][25][26]. Owing to the thermal hysteresis of the MT, ( ⏐, which can only be fulfilled if "paramagnetic" martensite has higher degree of magnetic order than paramagnetic austenite [14].…”

Section: Contributions To the Entropy Change At The Magnetostructuralmentioning

confidence: 96%

“…The main contributions to the measured transformation entropy changes, as commonly accepted, include structural and magnetic contributions [14,26]: …”

Section: Contributions To the Entropy Change At The Magnetostructuralmentioning

confidence: 99%

“…A C T -TO) has been widely proven for different metamagnetic alloys [14,15,[24][25][26]], a phenomenological model has been recently developed, based on a BraggWilliams approximation, accounting for the magnetic contribution. The model achieves excellent agreement between calculated and experimental ΔS for different composition and atomic order degrees, corroborating the magnetic origin of changes in transformation entropy [23,27].…”

Section: While a Decrease Of δS With Increasing (mentioning

confidence: 99%

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Contributions to the Transformation Entropy Change and Influencing Factors in Metamagnetic Ni-Co-Mn-Ga Shape Memory Alloys

Seguı́¹,

Cesari²

2014

Entropy

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Ni-Co-Mn-Ga ferromagnetic shape memory alloys show metamagnetic transition from ferromagnetic austenite to paramagnetic (or weak-magnetic) martensite for a limited range of Co contents. The temperatures of the structural and magnetic transitions depend strongly on composition and atomic order degree, in such a way that combined composition and thermal treatment allows obtaining martensitic transformation (MT) between any magnetic state of austenite and martensite. The entropy change ΔS measured in the magnetostructural transition comprises a magnetic contribution which depends on the type and degree of magnetic order of the related phases. Consequently, both the magnetization jump across the MT (ΔM) and ΔS are composition and atomic order dependent. Both ΔS and ΔM determine the effect of applied magnetic fields on the MT, hence knowledge and understanding of their behavior can help to approach the best conditions for magnetic field induced MT and related effects. In previous papers, we have reported findings regarding the behavior of the transformation entropy in relation to composition and atomic order in Ni50−xCoxMn25+yGa25−y (x = 3-8, y = 5-7) alloys. In the present paper we will review our recent results, summarizing the key findings and drawing general conclusions regarding the magnetic contribution to ΔS and the effect of different factors on the magnetic and structural properties of these metamagnetic alloys. OPEN ACCESSEntropy 2014, 16 5561

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Entropy change and effect of magnetic field on martensitic transformation in a metamagnetic Ni–Co–Mn–In shape memory alloy

Cited by 129 publications

References 15 publications

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

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

Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles

Contributions to the Transformation Entropy Change and Influencing Factors in Metamagnetic Ni-Co-Mn-Ga Shape Memory Alloys

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