Ni-Mn-Ga
6% magnetic field induced strain by twin boundary motion in ferromagnetic Ni–Mn–Ga
... Field-induced strains of 6% are reported in ferromagnetic Ni–Mn–Ga martensites at room temperature. The strains are the result of twin boundary motion driven largely by the Zeeman energy difference ...
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Mechanical and Magnetic Properties of Ni Mn Ga Gd Ferromagnetic Shape Memory Alloys
... ferromagnetic shape memory alloys were investigated in detail. The results show that an appropriate amount of Gd addition signi fi cantly improves the mechanical properties of Ni-Mn-Ga alloy. When the ...
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Effect of Hydrostatic Pressure on P 14M 2M and P 2M Martensitic Transformations in Single Crystalline Ni Mn Ga Ferromagnetic Shape Memory Alloys
... in Ni–Mn–Ga ...in Ni–Mn–Ga alloys described above, we select the succes- sive P-14M-2M transformation and P-2M transformation in this ...
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New Aspects of Structural and Magnetic Behaviour of Martensites in Ni Mn Ga Alloys
... The works dealing with the giant magnetostrain effect in the Ni–Mn–Ga alloy system are mainly focused on the en- largement of the field-induced deformations. Nevertheless, the possibility of ...
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Ni-Mn-Ga single crystal Shape Memory Alloy magneto-thermomechanical modeling
... Abstract. In the frame of Thermodynamics of irreversible process, a model describing the thermomagneto-mechanical behavior of a single crystal of Ni-Mn-Ga is built. The choice of internal variables ...
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Magnetomechanical performance and mechanical properties of Ni-Mn-Ga ferromagnetic shape memory alloys
... alloy Ni-Mn-Ga, the contraction of the crystal structure along the martensitic c-axis (which is also the magnetic easy axis) causes the alloy to tend to align its short crystal direction with the ...
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Phonon softening in Ni Mn Ga alloys
... in Ni-based alloys has tra- ditionally been described in terms of a tetragonal unit cell with a shuffling 共 modulated approach 兲 of the close-packed planes with 5 (5R martensite 兲 or 7 (7R martensite 兲 period- ...
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Shape Memory Behavior of Ni Mn Ga Sputtered Films under a Magnetic Field
... very brittle under the deformation. Hence, it is very difficult to make a plate or wire from the polycrystal material, and the reducing of the brittleness is indispensable to develop a material for practical use. It was ...
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Dynamic Response in the Low-kHz Range and Delta-E Effect in Ferromagnetic Shape Memory Ni-Mn-Ga
... Effect of Load The white noise excitation tests shown in Figures 5 and 6 suggest that there is a resonance peak located in the range below 1.8 kHz which stems for the Ni-Mn-Ga element and whose ...
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Transmission Electron Microscopy of Twins in 10M Martensite in Ni Mn Ga Ferromagnetic Shape Memory Alloy
... in Ni Mn Ga ferromagnetic shape memory alloy was investigated by conventional transmission electron microscopy (CTEM) and electron diffraction ...
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MAGNETIC AND STRUCTURAL PROPERTIES OF NI-MN-GA FILMS PRODUCED VIA PHYSICAL VAPOR TRI-DEPOSITION
... MSMA’s like Ni-Mn-Ga tend to undergo a macroscopic shape change u pon the application of an external magnetic field . The shape change is magnetoelastic if the MSMA returns to its original shape ...
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Martensitic Transformation and Microstructure of Sputter Deposited Ni–Mn–Ga Films
... A systematic study of the thickness effect on the martensitic transformation (MT), in combination with the direct observations of film substructure, is presented in this work. Two series of the submicron ...
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Analytical and experimental issues in Ni-Mn-Ga transducers
... Another feature observed in Figure 10 is the fact that while the pushrod resonances and the canister reso- nances are aligned near the 1.8 kHz and 14 kHz peaks, this is not the case for the 3.6 kHz peak. To illustrate, ...
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Analytical and experimental issues in Ni-Mn-Ga transducers
... the Ni-Mn-Ga system have been demonstrated to achieve a number of the criteria required for next generation actuators including the production of large theoretical strains up to ...on ...
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TWINNING MECHANISMS IN NON-MODULATED NI-MN-GA
... in Ni-Mn- Ga alloys proceeds through the field-induced displacement of twin boundaries in the martensite ...non-modulated Ni-Mn-Ga martensite were characterized with transmission ...
107
Study of Non-Homogeneity of Magnetic Field Distribution in Single-Crystal Ni-Mn-Ga Magnetic Shape Memory Element in Actuators due to its Anisotropic Twinned Microstructure
... [1]. Ni-Mn-Ga alloys are the most studied MSM alloys which exhibit enormous 6-12% maximum magnetic field induced strain (change in shape) depending on specimen microstructure [2], ...
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Transformation Temperatures and Electrochemical behavior of Polycrystalline Fe-Doped Ni-Mn-Ga and Co-Ni-Ga Alloys
... to Ni-Mn-Ga alloys which are used as ferromagnetic shape memory alloys. The analysis of corrosion rates was conducted by cyclic polarization curves with potentiostat-galvanostat equipment. The ...
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Reversible strain in Ni-Mn-Ga with collinear field and stress
... reorientation. Ni-Mn-Ga and other FSMAs have large magnetic anisotropy energies compared to the energy necessary to reorient the unit cells at the twin ...
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Valence Electron Concentration and Phase Transformations of Shape Memory Alloys Ni Mn Ga X
... Next, we turn our attention to the case that the Xatoms occupy the Ni sites. The X-DOS curves for s-Nm1-n1 are shown in Figs. 7 and 8. The curves of Co, Z27.5 and Ni in FC and FM phases are compared for the ...
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Determining Curie temperatures in dilute ferromagnetic semiconductors: high Curie temperature (Ga,Mn)As
... without any assumption about the values of b and c, and the b and c values can be obtained from the gradients. These Kouvel-Fisher (KF) plots 14 are established as the best approach for the determination of the critical ...
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