A dislocation model for the magnetic field induced shape memory effect in Ni2MnGa

AbstractA mechanism for shape memory alloys driven by a magnetic field is proposed. The mechanism involves the motion of twin dislocations in response to the application of a magnetic field. As a consequence, twin variants oriented favorably with respect to the magnetic field direction will grow. The maximum pressure that can be exerted at the twin dislocations is when the magnetic field is at angle . The shape memory effect is significantly affected by the presence of impurities, second-phase particles and grain boundaries

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Shape memory effect due to magnetic field-induced thermoelastic martensitic transformation in polycrystalline Ni–Mn–Fe–Ga alloy

Physics Letters A ◽

10.1016/s0375-9601(01)00688-0 ◽

2001 ◽

Vol 291 (2-3) ◽

pp. 175-183 ◽

Cited By ~ 105

Author(s):

A.A. Cherechukin ◽

I.E. Dikshtein ◽

D.I. Ermakov ◽

A.V. Glebov ◽

V.V. Koledov ◽

...

Keyword(s):

Magnetic Field ◽

Martensitic Transformation ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Thermoelastic Martensitic Transformation

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Temperature stability of magnetic field-induced strain and field-controlled shape memory effect on Ni/sub 52/Mn/sub 16.4/Fe/sub 8/Ga/sub 23.6/ single crystals

IEEE Transactions on Magnetics ◽

10.1109/tmag.2004.829289 ◽

2005 ◽

Vol 41 (3) ◽

pp. 1086-1088 ◽

Cited By ~ 9

Author(s):

Y.T. Cui ◽

Z.H. Liu ◽

M. Zhang ◽

G.D. Liu ◽

Y.X. Li ◽

...

Keyword(s):

Magnetic Field ◽

Shape Memory ◽

Single Crystals ◽

Shape Memory Effect ◽

Memory Effect ◽

Temperature Stability

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Shape memory effect and superelasticity of NiMnCoIn metamagnetic shape memory alloys under high magnetic field

Scripta Materialia ◽

10.1016/j.scriptamat.2015.08.027 ◽

2016 ◽

Vol 111 ◽

pp. 110-113 ◽

Cited By ~ 20

Author(s):

A.S. Turabi ◽

H.E. Karaca ◽

H. Tobe ◽

B. Basaran ◽

Y. Aydogdu ◽

...

Keyword(s):

Magnetic Field ◽

Shape Memory Alloys ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

High Magnetic Field

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Shape Memory Effect in Fe-Pd Magnetic Shape Memory Alloy Thin Films

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2107 ◽

2010 ◽

Vol 654-656 ◽

pp. 2107-2110

Author(s):

Jun Hyun Han ◽

Tae Ahn ◽

Hyun Kim ◽

Kwang Koo Jee

Keyword(s):

Magnetic Field ◽

Thin Film ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect ◽

Stress Change ◽

Composition Gradient ◽

Cantilever Beams ◽

Magnetic Shape Memory ◽

Magnetic Shape Memory Alloy

The shape memory effect (SME) and magnetic shape memory effect (MSME) Fe-Pd thin film are using the film curvature method. The corresponding residual stress change due to theSME and MSME in Fe-Pd film is measuredduring thermal cycling and magnetic field changing. AFe-Pd thin film with a lateral composition gradient is deposited onto micromachined x7 cantilever beam arraysubstrate,such that each of the cantilever beams is coated with a film of different composition.There is abrupt stress change in only .1 at % Pd as the temperature of the film is cycled, and the corresponding stress change was measured as 0.16 GPa. The film with .4 at % Pd showsthe abrupt stress change at 0.7 Tesla, which means that the composition has the MSME.

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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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