Journal ArticleDOI
Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase
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TLDR
In this paper, a magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase.Abstract:
Giant magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase. The strain proved to be caused by magnetic-field-controlled twin boundary motion. According to an analysis of x-ray diffraction data, the crystal structure of this phase is nearly orthorhombic, having lattice parameters a=0.619 nm, b=0.580 nm, and c=0.553 nm (in cubic parent phase coordinates) at ambient temperature. Seven-layer shuffling-type modulation along the (110)[110]p system was recorded. The results of mechanical tests and magnetic anisotropy property measurements are also reported.read more
Citations
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Over 7% magnetic field-induced strain in a Ni-Mn-Ga five-layered martensite
TL;DR: In this article, a Ni-Mn-Ga single crystal with a modulated five-layered martensite structure is reported, demonstrating giant magnetic field induced strain (MFIS) of 7.1% at room temperature and of 6% at temperatures close to the austenite transformation.
Journal ArticleDOI
Caloric effects induced by magnetic and mechanical fields in a Ni50Mn25−xGa25Coxmagnetic shape memory alloy
Pedro O. Castillo-Villa,D.E. Soto-Parra,José Andrés Matutes-Aquino,R. A. Ochoa-Gamboa,Antoni Planes,Lluís Mañosa,David González-Alonso,Marcelo Stipcich,Ricardo Romero,D. Ríos-Jara,H. Flores-Zúñiga +10 more
Journal ArticleDOI
Twin relationships of 5M modulated martensite in Ni–Mn–Ga alloy
TL;DR: In this article, a comprehensive microstructural and crystallographic investigation has been conducted on a bulk polycrystalline Ni 50 Mn 28 Ga 22 alloy, where the orientation measurements by electron backscatter diffraction (EBSD) were successfully performed to identify the crystallographic orientations on an individual basis.
Journal ArticleDOI
Correlation of electronic structure and martensitic transition in epitaxialNi2MnGafilms
TL;DR: The martensitic transition from the cubic austenite phase to the low symmetry martensite phase depends strongly on the chosen substrate as discussed by the authors, and the observed changes are in agreement with theoretical predictions.
Journal ArticleDOI
Boron’s effect on martensitic transformation and magnetocaloric effect in Ni43Mn46Sn11Bx alloys
TL;DR: The most used method for changing the martensitic transformation temperatures in the ferromagnetic shape memory alloys is tuning the valence election concentration e∕a In as discussed by the authors, the authors reported an alternative way, i.e., introducing few interstitial boron atoms in Ni43Mn46Sn11 alloy.
References
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Journal ArticleDOI
Large magnetic‐field‐induced strains in Ni2MnGa single crystals
TL;DR: In this paper, the superelastic motion of twin boundaries in the martensitic phase of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K was found to be associated with the staining.
Journal ArticleDOI
6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni–Mn–Ga
TL;DR: In this paper, a simple model accounts quantitatively for the dependence of strain on magnetic field and external stress using as input parameters only measured quantities, and the strain versus field curves exhibit appreciable hysteresis associated with the motion of the twin boundaries.
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Magnetostriction of martensite
Richard D. James,Manfred Wuttig +1 more
TL;DR: In this article, a general strategy for inducing magnetostriction in ferromagnetic martensitic materials is described, and an analysis of domain redistribution caused by a magnetic field is given.
Journal ArticleDOI
Model for strain and magnetization in magnetic shape-memory alloys
TL;DR: In this paper, a simple phenomenological model for the magnetization process and field-induced strain by twin-boundary and phaseboundary motion is proposed for both the strong and weak anisotropy cases.
Journal ArticleDOI
Crystal structure of martensitic phases in Ni–Mn–Ga shape memory alloys
TL;DR: The crystal structures of the different martensitic phases observed in a wide variety of Ni-Mn-Ga alloy compositions have been studied in detail as discussed by the authors, and two approaches taken from the literature are analysed and discussed.