Results 201 to 210 of about 898 (243)

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
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A new ferromagnetic shape memory alloy system

Scripta Materialia, 2001
It is shown that the alloys Co2Ni1−xGa1+x, x = 0.06, 0.09, 0.12, 0.15, are ferromagnetic shape memory alloys.
Manfred Wuttig, Jian Li, Corneliu Craciunescu   +2 more
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Phenomenological modeling of ferromagnetic shape memory alloys

SPIE Proceedings, 2004
A thermodynamically consistent phenomenological model is presented which captures the ferromagnetic shape memory effect, i. e. the large macroscopically observable shape change of magnetic shape memory materials under the application of external magnetic fields.
Bjorn Kiefer, Dimitris C. Lagoudas
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Magnetization and shape memory effect of ferromagnetic shape memory alloy wire

IEEE Transactions on Magnetics, 1999
Magnetization and shape memory effect (SME) of Fe-Mn-Cr-Si, magnetic shape memory alloy(SMA) have been investigated. The specimen used is a commercial product wire of diameter 1.2 mm. The properties largely depend on heat treatment conditions, so it is treated thermally under three different conditions. As a result, pre-heating before heat treatment is
T. Kanada, M. Enokizono
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Shape memory effect of dual-phase NiMnGaTb ferromagnetic shape memory alloys

Journal of Iron and Steel Research International, 2018
The evolution of microstructure, reverse martensitic transformation and the correlated influence on shape memory effect was investigated in as-cast and directionally solidified dual-phase NiMnGaTb alloys. The directionally solidified alloys exhibit single-crystal microstructure, preferred dendrite microstructure, and mussy dendrite microstructure in ...
Jiang Zhang, Yong-hong Ma, Ruo-lin Wu, Jing-min Wang   +3 more
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Properties of Co-alloyed Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

Journal of Materials Engineering and Performance, 2009
It is experimentally found that in the Ni54Fe20-xCoxGa26 ferromagnetic shape memory alloys, Co variation from 0 to 9 at.% leads to: (i) almost linear change of martensitic transformation temperatures from 270 °C to 120 °C; (ii) a non-monotonous change of the Curie temperature, and (iii) a linear decrease of saturation magnetization from 60 to 43 Am2/kg.
Chernenko VA, Oikawa K, Chmielus M, Besseghini S, Villa E, Albertini F, Righi L, Paoluzi A, Mullner P, Kainuma R, Ishida K   +10 more
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Martensitic transformation and shape memory effect in Ni54.75Mn13.25Fe7Ga25 ferromagnetic shape memory alloy

Materials Science and Engineering: A, 2008
Abstract The martensitic transformation and shape memory effect of Ni 54.75 Mn 13.25 Fe 7 Ga 25 (at.%) alloy are studied in the present paper. It is shown that tetragonal martensite with parallel bands substructure transforms to parent phase heated by electron beam.
H.B. Wang, J.H. Sui, C. Liu, W. Cai
openaire   +1 more source