ChemInform Abstract: Characterization of Magnetoelastic Coupling in Ferromagnetic Shape Memory Alloys Using Neutron Diffraction

ChemInform ◽  
2014 ◽  
Vol 45 (20) ◽  
pp. no-no
Author(s):  
Abhijit Pramanick ◽  
Xun-Li Wang
Keyword(s):  
Neutron Diffraction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Magnetoelastic Coupling ◽  
Abstract Characterization ◽  
Ferromagnetic Shape Memory

scholarly journals Effect of atomic order in ferromagnetic shape memory alloys studied by neutron diffraction

2010 ◽  
Vol 66 (a1) ◽  
pp. s36-s36
Author(s):  
J. A. Rodríguez-Velamazán ◽  
Vicente Sánchez-Alarcos ◽  
J. I. Pérez-Landazábal ◽  
V. Recarte ◽  
C. Gómez-Polo ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Atomic Order ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

Hydrostatic Training and Characterization of near Stoichiometric Ni-Mn-Ga Alloy

2020 ◽  
Vol 835 ◽  
pp. 22-27
Author(s):  
Nour Mahmoud Eldabah ◽  
Saleh Mohammed Kayetbay ◽  
Mohammed A. Gepreel ◽  
Ahmed Mohamed El-Assal
Keyword(s):  
Magnetic Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Stoichiometric Composition ◽  
Hydraulic Press ◽  
Ferromagnetic Shape Memory Alloys ◽  
Xrd Pattern ◽  
High Frequencies ◽  
Ferromagnetic Shape Memory

Shape memory alloys are programmed to memorize original trained shape. Ni-Mn-Ga is one of the ferromagnetic shape memory alloys. It is used as actuator, and sensor due to large output strain at high frequencies. This work presents a study on enhancing magnetic properties of thermally treated alloy by using new method of training in which alloys are exposed to different hydrostatic pressures using pressing die. Single near stoichiometric composition was produced. Elemental analysis showed homogeneity of the alloy. XRD pattern revealed Martensitic phase peaks. Transformation temperature was found to be below 100 OC. Training was applied by hydrostatic pressing die. Different training pressures were obtained using hydraulic press. After applying hydrostatic pressures starting from 2.5 bar to 10 bar, it was found that pressures up to 7.5 bar will increase the coercivity and saturation magnetization of the alloy, while pressures beyond 7.5 bar lessened these magnetic properties.

scholarly journals Structural, Thermal and Magnetic Characterization of Ni-Mn-Ga Ferromagnetic Shape Memory Alloys

2012 ◽  
Vol 1 (1) ◽  
pp. 1-7 ◽  
Author(s):  
R. Jesintha Rani ◽  
R. Senthur Pandi ◽  
S. Seenithurai ◽  
S. Vinodh Kumar ◽  
M. Muthuraman ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Magnetic Characterization ◽  
Ferromagnetic Shape Memory

Neutron diffraction study on crystal structure and phase transformation in Ni-Mn-Ga ferromagnetic shape memory alloys

2007 ◽  
Vol 22 (4) ◽  
pp. 307-311 ◽  
Author(s):  
D. Y. Cong ◽  
Y. D. Wang ◽  
J. Z. Xu ◽  
L. Zuo ◽  
P. Zetterström ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Transformation ◽  
Neutron Diffraction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Neutron Diffraction Study ◽  
Martensitic Structure ◽  
Ferromagnetic Shape Memory Alloys ◽  
Structure Changes ◽  
Ferromagnetic Shape Memory

Crystal structure and phase transformation behaviors in two Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) with compositions of Ni48Mn30Ga22 and Ni53Mn25Ga22 (at. %) as a function of temperature were investigated by in situ neutron diffraction experiments. Neutron diffraction technique proves to be highly efficient in characterizing structural transformation in Ni-Mn-Ga FSMAs, which consist of nearby elements in the periodic table. Our neutron results show that Ni48Mn30Ga22 has a cubic, L21 Heusler structure from 373 to 293 K. Its crystal structure changes into a seven-layered orthorhombic martensitic structure when cooled to 243 K, and no further transformation is observed upon cooling to 19 K. Neutron diffraction results also show that Ni53Mn25Ga22 has a tetragonal I4/mmm martensitic structure from 20 to 403 K. A pre-transformation around room temperature is observed from an abrupt jump in unit-cell volume of Ni53Mn25Ga22, which corresponds with an endothermic peak detected in a heated DSC curve.

Neutron Diffraction Studies of Magnetic Shape Memory Alloys

2011 ◽  
Vol 684 ◽  
pp. 73-84 ◽  
Author(s):  
José M. Barandiarán ◽  
Jon Gutiérrez ◽  
Patricia Lázpita ◽  
J. Feuchtwanger
Keyword(s):  
Crystal Structure ◽  
Neutron Diffraction ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Site Occupancy ◽  
Magnetic Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Magnetic Shape Memory Alloys ◽  
Moment Distribution ◽  
Ferromagnetic Shape Memory

The characteristics of neutron diffraction applied to the study of Ferromagnetic Shape Memory Alloys are revised. Main studies refer to crystal structure, preferential site occupancy, variant reorientation and magnetic moment distribution in the alloys

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