Results 221 to 230 of about 10,844 (271)

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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Ferromagnetic shape memory alloys: A theoretical approach

Journal of Applied Physics, 2007
The interaction of crystallographic twin boundaries with an external magnetic field as a mechanism for shape deformation is analyzed theoretically and applied to the alloy Ni2MnGa. A defect, modeled as a Gaussian strain distribution interacting elastically with the twin boundary, is localized in one of the two variants bordering the twin boundary ...
D. I. Paul, W. McGehee, R. C. O’Handley, M. Richard   +3 more
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Mechanomagnetic spectroscopy of ferromagnetic shape memory alloys

Materials Science and Engineering: A, 2009
Abstract We have used a recently designed mechanomagnetic spectroscopy technique to study the inverse magnetoelastic effect (stress-induced magnetization) in ferromagnetic materials simultaneously with their elastic and anelastic properties. Special attention has been paid to ferromagnetic shape memory alloys.
S. Kustov, M.L. Corró, E. Cesari
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Dynamic Behavior of Ferromagnetic Shape Memory Alloys

47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference<BR> 14th AIAA/ASME/AHS Adaptive Structures Conference<BR> 7th, 2006
The eect of Eddy currents on the dynamic behavior of ferromagnetic shape memory alloys in changing magnetic fields is studied. Due to the presence of Eddy currents, the internal magnetic field lags behind the applied field, resulting in a delay in the martensitic variant reorientation.
Sam Scoby, Yi-chao Chen
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Elasticity Study in Ferromagnetic Shape Memory Alloys

MRS Proceedings, 2003
ABSTRACTThe temperature dependences of the elastic constants of Ni0.50Mn0.284Ga0.216 and Fe3Pd were studied. Measurements were conducted by the ultrasonic continuous wave method. Anomalous behavior of the elastic constants temperature dependence in austenitic NiMnGa was observed, especially an abrupt 15% softening of C11 at the Curie temperature.
Liyang Dai, James Cullen, Jun Cui, Manfred Wuttig   +3 more
openaire   +1 more source