Microstructural analysis and phase transformation in Ni–Mn–Ga ferromagnetic shape memory alloys

2005 ◽  
Vol 14 (6) ◽  
pp. 1403-1409 ◽  
Author(s):  
Manickam Mahendran
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Microstructural Analysis ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

On the stress-assisted magnetic-field-induced phase transformation in Ni2MnGa ferromagnetic shape memory alloys

2007 ◽  
Vol 55 (13) ◽  
pp. 4253-4269 ◽  
Author(s):  
H.E. Karaca ◽  
I. Karaman ◽  
B. Basaran ◽  
D.C. Lagoudas ◽  
Y.I. Chumlyakov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

Phase Transformation and Microstructures in Ni and Cu Base Ferromagnetic Shape Memory Alloys

2007 ◽  
pp. 3157-3162
Author(s):  
Takuro Kushima ◽  
Koichi Tsuchiya ◽  
Yasuyoshi Sho ◽  
Takafumi Yamada ◽  
Yoshikazu Todaka ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory

scholarly journals Phase transformation and microstructures in Ni-Mn-Ga ferromagnetic shape memory alloys

2001 ◽  
Vol 11 (PR8) ◽  
pp. Pr8-263-Pr8-268 ◽  
Author(s):  
K. Tsuchiya ◽  
H. Nakamura ◽  
D. Ohtoyo ◽  
H. Nakayama ◽  
M. Umemoto ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
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.

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