Intermartensitic phase transformations in Ni–Mn–Ga studied under magnetic field

Chernenko, V.A.; Cesari, E.; Ховайло, В. В.; Pons, J.; Seguı́, C.; Takagi, Toshiyuki

doi:10.1016/j.jmmm.2004.11.399

Cited by 25 publications

(8 citation statements)

References 15 publications

(16 reference statements)

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“…The values of M S and M F at ZFC are indicated for comparison. Most of the structural investigations during the cooling cycles attribute to the austenitic to martensitic transformation [13] and intermartensitic transformation [14]. It is known that during the cooling cycle, the magnetization drops due to the transformation of low magnetocrystalline anisotropic austenite to a high magnetocrystalline anisotropic martensite.…”

Section: Discussionmentioning

confidence: 99%

Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy

Panda

Singh

Das

et al. 2009

J. Phys. D: Appl. Phys.

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The investigation addresses the effect of magnetizing field on the magnetic properties of melt spun Ni52.84Mn19.6Ga27.56 (at%) alloy ribbons. Magnetization behaviour at different fields was observed using a superconducting quantum interference device magnetometer for heating and cooling cycles. The plots showed distinct changes in magnetization around the characteristic temperatures at austenitic start and finish (AS, AF), martensitic start and finish (MS, MF). With increasing field AS, MF were unaffected. In the range of martensitic start and its finish temperature, the zero field cooled and field cooled measurements indicated magnetization drops indicating antiferromagnetic interactions, which is characteristic of the martensitic phase formation. It was shown from x-ray diffraction analysis that the low martensitic fraction in the majority austenite phase induced the splitting in the L21 austenitic ordering. This was further corroborated by the evidence of a few martensitic plates around grain boundaries at room temperature which is close to martensitic start temperature.

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Section: Discussionmentioning

confidence: 99%

Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy

Panda

Singh

Das

et al. 2009

J. Phys. D: Appl. Phys.

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“…Further intermartensitic transitions between various martensite phases can occur at lower temperatures. Mn-rich bulk single crystals often exhibit sequences of intermartensitic transformations 10M!14M!NM upon cooling [37][38][39] or under stress, [22,24] suggesting that the NM state might be the lowestenergy state for Mn-rich alloys. Upon heating, the reverse sequence can be observed but with a large thermal hysteresis.…”

Section: Search For the Ground State Of Ni 2 Mngamentioning

confidence: 99%

Experimental Observations versus First‐Principles Calculations for Ni–Mn–Ga Ferromagnetic Shape Memory Alloys: A Review

Seiner

Zelený

Sedlák

et al. 2022

Physica Rapid Research Ltrs

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This review summarizes recent advances in first‐principles simulations of the structural, mechanical, and magnetomechanical properties of Ni–Mn–Ga‐based ferromagnetic shape memory alloys from the perspective of experimental characterization. It focuses on calculations that can capture the main features of the low‐temperature phases, particularly the appearance of spatial modulations, the occurrence of intermartensitic transitions, and the high mobility of the twin boundaries, which allows for magnetically induced reorientation. Although the calculations can only be used to interpret some of these features and are not yet ready to be used as a tool for designing new alloys with the required properties, the gap between experimental observations and simulations is narrowing. When experiments and theory are discussed together, new challenges arise for both. In addition, new results on first‐principles‐determined elastic constants of the 10M martensite of Ni–Mn–Ga are presented and discussed with respect to the high mobility of the twin boundaries.

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“…In that case, variation of sign of the magnetoelastic constant should result in a change of the type of anisotropy (for instance, from easy axis to easy plane) and, therefore, in strong modification of magnetic domain structure and even produce intermartensitic transitions. In this respect, it is worth to mention that FSMA are known to demonstrate a number of structural modifications, which have been detected by magnetic, calorimetric, resistance and internal friction studies [22][23][24][25][26][27][28][29][30][31], whose physical origin remains unclear. Interestingly and in line with the present observations of the Villari critical points, magnetic anomalies in FSMA exist only for low applied fields, see e.g.…”

Section: Peculiarities Of Magnetoelastic Coupling In Ferromagnetic Mamentioning

confidence: 99%

Mechanomagnetic spectroscopy of ferromagnetic shape memory alloys

Kustov

Corró

Cesari

2009

Materials Science and Engineering: A

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Intermartensitic phase transformations in Ni–Mn–Ga studied under magnetic field

Cited by 25 publications

References 15 publications

Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy

Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy

Experimental Observations versus First‐Principles Calculations for Ni–Mn–Ga Ferromagnetic Shape Memory Alloys: A Review

Mechanomagnetic spectroscopy of ferromagnetic shape memory alloys

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