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

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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NiMn-Based Metamagnetic Shape Memory Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.635.23 ◽

2009 ◽

Vol 635 ◽

pp. 23-31 ◽

Cited By ~ 14

Author(s):

Ryosuke Kainuma ◽

K. Ito ◽

W. Ito ◽

R.Y. Umetsu ◽

T. Kanomata ◽

...

Keyword(s):

Magnetic Properties ◽

Powder Metallurgy ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Parent Phase ◽

Martensite Phase ◽

Ternary Alloys ◽

Plasma Sintering ◽

Spark Plasma

The magnetic properties of the parent and martensite phases of the Ni2Mn1+xSn1-x and Ni2Mn1+xIn1-x ternary alloys and the magnetic field-induced shape memory effect obtained in NiCoMnIn alloys are reviewed, and our recent work on powder metallurgy performed for NiCoMnSn alloys is also introduced. The concentration dependence of the total magnetic moment for the parent phase in the NiMnSn alloys is very different from that in the NiMnIn alloys, and the magnetic properties of the martensite phase with low magnetization in both NiMnSn and NiMnIn alloys has been confirmed by Mössbauer examination as being paramagnetic, but not antiferromagnetic. The ductility of NiCoMnSn alloys is drastically improved by powder metallurgy using the spark plasma sintering technique, and a certain degree of metamagnetic shape memory effect has been confirmed.

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Magnetic Properties and Microstructures of Rapidly Solidified FePd Alloy Ribbons

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.59.24 ◽

2008 ◽

Vol 59 ◽

pp. 24-29 ◽

Cited By ~ 8

Author(s):

Yoichi Kishi ◽

Zenjiro Yajima ◽

Teiko Okazaki ◽

Yasubumi Furuya ◽

Manfred Wuttig

Keyword(s):

Magnetic Field ◽

Magnetic Properties ◽

Coercive Force ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Room Temperature ◽

Parent Phase ◽

Diffraction Profile ◽

Rapidly Solidified

It is well known that FePd alloys are effective as a magneto-thermoelastic actuator material, because they have large magnetostriction and shape memory effect. In order to use the alloys for a micro-actuator, magnetic properties and microstructures have been examined as for rapidly solidified Fe-29.6 at% Pd alloy ribbons. The ribbons exhibit a large magnetostriction at room temperature and good shape memory effect. Magnetostriction and coercive force of the ribbons markedly depend on the direction of the applied magnetic field. Maximum values of magnetostriction and coercive force are obtained at θ = 85 degree (θ is the angle between the magnetic field and the ribbon plane). Relief effects corresponding to the formation of FCT martensite variants are observed on the grains. X-ray diffraction profile at room temperature shows that FCT martensitic phase and FCC parent phase coexist in the ribbon. Dense striations are observed in the TEM bright field images of FCT martensite plates. Selected area electron diffraction patterns revealed the striations to be thin twins.

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

ChemInform ◽

10.1002/chin.201212211 ◽

2012 ◽

Vol 43 (12) ◽

pp. no-no

Author(s):

R. Kainuma ◽

W. Ito ◽

R. Y. Umetsu ◽

V. V. Khovaylo ◽

T. Kanomata

Keyword(s):

Magnetic Properties ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Heusler Alloys

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Ferromagnetic Shape Memory Heusler Alloys

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.189.189 ◽

2012 ◽

Vol 189 ◽

pp. 189-208 ◽

Cited By ~ 1

Author(s):

Vijay Srivastava ◽

Kanwal Preet Bhatti

Keyword(s):

Magnetic Properties ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Heusler Alloy ◽

Heusler Alloys ◽

Structural Similarity ◽

Magnetic Shape Memory ◽

Half Metallicity ◽

Ferromagnetic Shape Memory

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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Martensitic Transformation and Shape Memory Effect of Ni53.25Mn21.75Ga25 Ferromagnetic Shape Memory Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.1504 ◽

2012 ◽

Vol 476-478 ◽

pp. 1504-1507

Author(s):

Hai Bo Wang ◽

Shang Shen Feng ◽

Pei Yang Cai ◽

Yan Qiu Huo

Keyword(s):

Magnetic Field ◽

Martensitic Transformation ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Parent Phase ◽

Transformation Strain ◽

Scanning Calorimetry ◽

Reversible Transformation ◽

Ferromagnetic Shape Memory

The martensitic transformation, crystalline structure, microstructure and shape memory effect of the Ni53.25Mn21.75Ga25 (at.%) alloy are investigated by means of Differential Scanning Calorimetry (DSC), X-ray diffraction (XRD), Transmission Electron Microscope (TEM) and the standard metal strain gauge technique. The XRD results showed that the Ni53.25Mn21.75Ga25 alloy is composed of cubic parent phase at room temperature. TEM observation proved that the typical twin martensite is tetragonal structure and tweed-like contrast which is typical image for the parent phase. A large reversible transformation strain, about 0.54%, is obtained in this undeformed polycrystalline alloy due to martensitic transformation and its reverse transformation. This transformation strain is also increased to 0.65% by the external magnetic field. It is believed that the effect of the magnetic field on the preferential orientation of martensitic variants increases the transformation strain.

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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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Variation in Transformation Temperature and Shape Memory Effect in Cu-Al-Be Shape Memory Alloys with the Effect of Quaternary Elements

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.813-814.246 ◽

2015 ◽

Vol 813-814 ◽

pp. 246-251 ◽

Cited By ~ 3

Author(s):

S. Prashantha ◽

S.M. Shashidhara ◽

U.S. Mallikarjun ◽

A.G. Shivasiddaramaiah

Keyword(s):

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Transformation Temperature ◽

Parent Phase ◽

Optical Microscope ◽

Martensite Phase ◽

Ternary Alloys ◽

Ingot Metallurgy ◽

Lower Temperature

Cu-Al-Be Ternary alloys are prepared by ingot metallurgy route, which exhibits parent phase or Austenite phase at high temperature and Martensite phase at low temperature and also exhibits shape memory effect upon quenching to lower temperature. The Cu-Al-Be SMA was in the range of 10-12wt% of Al and 0.4-0.5 wt% of Be is chosen for present study and different amount of quaternary element is added to the ternary alloy. The variation in shape memory effect, transformation temperature and microstructure is studied by using bend test, differential scanning calorimeter and Optical microscope.

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Shape Memory Alloys

MRS Bulletin ◽

10.1557/s0883769400037350 ◽

1993 ◽

Vol 18 (4) ◽

pp. 49-56 ◽

Cited By ~ 76

Author(s):

C.M. Wayman

Keyword(s):

Phase Transformation ◽

Shape Memory Alloys ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Parent Phase ◽

Martensite Phase ◽

Martensitic Phase ◽

Martensitic Phase Transformation ◽

Lower Temperature

Numerous metallic alloys are now known to exhibit a shape memory effect through which an article deformed at a lower temperature will regain its original undeformed shape when heated to a higher temperature. This behavior is basically a consequence of a martensitic phase transformation. When compared, the various shape memory materials are found to have common characteristics such as atomic ordering, a thermoelastic martensitic transformation that is crystallographically reversible, and a martensite phase that forms in a self-accommodating manner. The explanation of the shape memory phenomenon is now universal and well in hand. In addition to the familiar “one-way” memory, shape memory alloys also exhibit a “two-way” memory as well and a “mechanical” shape memory resulting from the formation and reversal of stressinduced martensite.Fundamental to the shape memory effect (SME) is the occurrence of a martensitic phase transformation and its subsequent reversal Basically, a shape memory alloy (SMA) is deformed in the martensitic condition (martensite), and the shape recovery occurs during heating when the specimen undergoes a reverse transformation of the martensite to its parent phase. This is the essence of the shape memory effect. Materials that exhibit shape memory behavior also show a two-way shape memory, as well as a phenomenon called superelasticity. These are also discussed.The shape memory response after deformation and thermal stimulation constitutes “smart” behavior, i.e., Stimulated Martensite-Austenite Reverse Transformation.

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