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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Journal ArticleDOI
The effect of the deposition rate on the crystallographic texture, microstructure evolution and magnetic properties in sputter deposited Ni-Mn-Ga thin films
TL;DR: In this paper, the development of the texture in Ni-Mn-Ga thin films is mainly governed by the minimization of surface energy and strain energy, and the overall compositions of the films were strongly dependent on the sputtering power.
Journal ArticleDOI
Thermal and damping behaviour of magnetic shape memory alloy composites
Susanne Glock,Véronique Michaud +1 more
TL;DR: In this article, single crystals of ferromagnetic shape memory alloys (MSMA) exhibit magnetic field and stress induced strains via energy dissipating twinning, which is suitable for damping applications.
Dissertation
Electronic, magnetic and thermodynamic properties of magnetic shape memory alloys from first principles
TL;DR: The Heusler-Legierung Ni2MnGa as discussed by the authors is a magnetisches Formgedachtnis-Effekt, which is ein vielversprechendes magnetishes material, dass allerdings eine fur industrielle Anwendungen zu niedrige martensitische Ubergangstemperatur aufweist und vergleichsweise sprode ist.
Journal ArticleDOI
Composition dependence of martensitic transformation and crystal structure in Ni50Mn25Ga25-xCux Heusler alloys
TL;DR: A detailed analysis of the influence of Cu addition on the martensitic transformation and the composition dependent transitions in Ni50-xMn25Ga25Cux Heusler alloys after two types of heat treatment was carried out.
Journal ArticleDOI
Microstructure and martensitic transformation behavior of Ni 56−x Mn 25 Fe x Ga 19 shape memory alloys
Yan Xin,Liang Chai +1 more
TL;DR: In this paper, the shape memory properties of Ni56-xMn25FexGa19 (x = 0, 2, 4, 6, 8) shape memory alloys were investigated using optical microscopy (OM), X-ray diffraction analysis (XRD), differential scanning calorim- eter (DSC), and compressive test.
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.
Journal ArticleDOI
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.