Results 191 to 200 of about 898 (243)

Magnetostriction in ferromagnetic shape memory alloys

Journal of Magnetism and Magnetic Materials, 2001
Abstract There is intense interest in the development of new magnetostrictive materials having large strains. Recent experiments [1,2] showed that the ferromagnetic shape memory alloys (SMA) have some perspectives to generate significant magnetic-field-induced deformations.
V.V. Kokorin, M. Wuttig
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Rapidly solidified ferromagnetic shape memory alloys

The European Physical Journal Special Topics, 2008
Ferromagnetic shape memory alloys have been manufactured by various techniques involving rapid solidification. Bulk alloys have been obtained by extracting the melted alloy in especially designed copper molds; glass coated wires have been obtained by drawing the melt from glass recipients followed by water cooling and ribbons have been fabricated by ...
C. M. Craciunescu, A. Ercuta, I. Mitelea, M. Valeanu, V. S. Teodorescu, N. Lupu, H. Chiriac   +6 more
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Ferromagnetic shape memory alloys: Scientific and applied aspects

Sensors and Actuators A: Physical, 2008
The underlying mechanisms responsible for the giant magnetic or mechanical field-induced-strains in ferromagnetic shape memory alloys are briefly discussed based on a phenomenological approach. The fundamental aspect is illustrated by the experimental results related to the lattice, mechanical and magnetic instabilities in the prototype Ni-Mn-Ga ...
Chernenko VA, Besseghini S
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Ferromagnetic shape memory alloys: Theory of interactions

Journal of Applied Physics, 2005
Twin boundary motion in a viscous discrete lattice is examined in the presence of a dislocation defect and a magnetic driving force supplemented by an acoustical signal. The results show, amongst others, a resistance to twin boundary motion due to lattice discreteness and a large but temporary reduction in twin boundary velocity during the interaction ...
D. I. Paul, R. C. O’Handley, Bradley Peterson   +2 more
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Occurrence of ferromagnetic shape memory alloys (invited)

Journal of Applied Physics, 2000
This article presents an overview of the necessary conditions for the formation of shape memory alloys (SMAs) and how these must overlap with the occurrence of ferromagnetism so that ferromagnetic shape memory alloys (MSMAs) may be formed. The electronic, elastic, and geometric conditions permit an understanding of the occurrence of Cu- and Fe-based ...
Manfred Wuttig, Luohong Liu, Koichi Tsuchiya, Richard D. James   +3 more
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Giant Magnetostriction in Ferromagnetic Shape-Memory Alloys

MRS Bulletin, 2002
AbstractShape-memory alloys are now widely used because they exhibit a large recoverable strain, which is caused by the conversion of variants in the martensite phase. The conversion of variants is usually promoted by the application of external stress.
Tomoyuki Kakeshita, Kari Ullakko
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Entropy Changes in Ferromagnetic Shape Memory Alloys

Materials Science Forum, 2011
Several features of the entropy change S related to the martensitic transformation (MT) in metamagnetic alloys are discussed. In these alloys a change in magnetic order is concomitant with the MT, as it occurs between ferromagnetic austenite and non-magnetic (weakly magnetic) martensite. In this case it has been shown that S strongly decreases as the
Eduard Cesari, Daniel Salas, Sergey Kustov   +2 more
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Magnetoresistance in ferromagnetic shape memory alloy NiMnFeGa

Journal of Magnetism and Magnetic Materials, 2011
The magnetoresistance (MR){=[R(H) - R(0)]/R(0)} properties in ferromagnetic shape memory alloy of NiMnFeGa ribbons and single crystals, and NiFeGa ribbons have been investigated. It is found that the NiMnFeGa melt-spun ribbon exhibited GMR effect, arising from the spin-dependent scattering from magnetic inhomogeneities consisting of ...
Z.H. Liu, X.Q. Ma, Z.Y. Zhu, H.Z. Luo, G.D. Liu, J.L. Chen, G.H. Wu, Xiaokai Zhang, John Q. Xiao   +8 more
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ChemInform Abstract: Ferromagnetic Shape Memory Alloy Actuators

ChemInform, 2010
AbstractReview: 68 refs.
Yuanchang Liang, Minoru Taya
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Fe 3 Pd ferromagnetic shape memory alloys

Journal of Applied Physics, 2003
Fe 3 Pd alloys are potentially useful ferromagnetic shape memory materials with a maximum predicted strain of up to 6.8%. Currently, however, there are difficulties with fabrication of the desired fct-ordered martensitic phase. The experimentally observed ground state of Fe3Pd is a nonreversible bct phase, and a rapid quench is required to form the ...
R. A. Stern, S. D. Willoughby, J. M. MacLaren, J. Cui, Q. Pan, R. D. James   +5 more
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