Cooling-induced shape memory effect and inverse temperature dependence of superelastic stress in Co2Cr(Ga,Si) ferromagnetic Heusler alloys

Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.

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Reentrant Martensitic Transformation and Novel Shape Memory Effect in Co-based Heusler Alloys

Materia Japan ◽

10.2320/materia.55.421 ◽

2016 ◽

Vol 55 (9) ◽

pp. 421-425 ◽

Cited By ~ 1

Author(s):

Xiao Xu

Keyword(s):

Martensitic Transformation ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Heusler Alloys

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Temperature dependence and temperature limits of magnetic shape memory effect

Journal of Applied Physics ◽

10.1063/1.1626800 ◽

2003 ◽

Vol 94 (11) ◽

pp. 7139-7143 ◽

Cited By ~ 112

Author(s):

Oleg Heczko ◽

Ladislav Straka

Keyword(s):

Shape Memory ◽

Temperature Dependence ◽

Shape Memory Effect ◽

Memory Effect ◽

Magnetic Shape Memory

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Direct measurement of shape memory effect for Ni54Mn21Ga25, Ni50Mn41.2In8.8 Heusler alloys in high magnetic field

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2019.02.087 ◽

2019 ◽

Vol 482 ◽

pp. 317-322 ◽

Cited By ~ 3

Author(s):

Dmitry S. Kuchin ◽

Elvina T. Dilmieva ◽

Yurii S. Koshkid'ko ◽

Alexander P. Kamantsev ◽

Victor V. Koledov ◽

...

Keyword(s):

Magnetic Field ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Direct Measurement ◽

High Magnetic Field ◽

Heusler Alloys

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Martensitic transformation and shape memory effect at high temperatures in off-stoichiometric Co2VSi Heusler alloys

Materials Science and Engineering A ◽

10.1016/j.msea.2016.08.083 ◽

2016 ◽

Vol 676 ◽

pp. 191-196 ◽

Cited By ~ 19

Author(s):

Hengxing Jiang ◽

Xiao Xu ◽

Toshihiro Omori ◽

Makoto Nagasako ◽

Jingjing Ruan ◽

...

Keyword(s):

Martensitic Transformation ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

High Temperatures ◽

Heusler Alloys

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The Ductility and Shape-Memory Properties of Ni–Mn–Ga–Cu Heusler Alloys

Metallurgical and Materials Transactions A ◽

10.1007/s11661-021-06526-9 ◽

2021 ◽

Author(s):

Agnieszka Brzoza-Kos ◽

Eduard Cesari ◽

Maciej Jakub Szczerba

Keyword(s):

Crystal Structure ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Heusler Alloys ◽

Potential Candidate ◽

Recoverable Strain ◽

Cu Content ◽

Memory Applications ◽

Large Shape

AbstractThe effect of Cu addition on crystal structure, compressive properties and shape-memory effect of Ni50Mn25Ga25−xCux alloys was studied. With increasing Cu content, the type of crystal structure evolves following a sequence: L21 → 10M → 2M → 2M+γ. Addition of Cu significantly improves room temperature ductility. In polycrystalline Ni50Mn25Ga17Cu8 alloy, a full recoverable strain equal to 7 pct was achieved. High martensitic transformation temperature and large shape-memory effect makes this material potential candidate in high-temperature shape-memory applications.

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Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.684.139 ◽

2011 ◽

Vol 684 ◽

pp. 139-150 ◽

Cited By ~ 5

Author(s):

Ryosuke Kainuma ◽

W. Ito ◽

R.Y. Umetsu ◽

V.V. Khovaylo ◽

T. Kanomata

Keyword(s):

Magnetic Field ◽

Phase Transition ◽

Magnetic Properties ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Heusler Alloys ◽

Parent Phase ◽

Martensite Phase ◽

Basic Information

In some Ni-Mn-In- and Ni-Mn-Sn-based Heusler-type alloys, martensitic transformation from the ferromagnetic parent phase to the paramagnetic martensite phase appears and magnetic field-induced reverse transformation, namely, metamagnetic phase transition, is detected. In this paper, the metamagnetic shape memory effect due to the metamagnetic phase transition and the magnetostress effect in the Ni-Co-Mn-In alloys are introduced and the phase diagrams of Ni50Mn50-yXy (X: In, Sn, Sb) alloys are shown as basic information. Furthermore, the magnetic properties of both the parent and martensite phases in the Ni-Mn-In- and Ni-Mn-Sn-based metamagnetic shape memory alloys are also reviewed.

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