TY - JOUR
T1 - Martensitic and magnetic transformations of Ni-Ga-Fe-Co ferromagnetic shape memory alloys
AU - Imano, Y.
AU - Omori, T.
AU - Oikawa, K.
AU - Sutou, Y.
AU - Kainuma, R.
AU - Ishida, K.
N1 - Funding Information:
The present study was supported by the Industrial Technology Research Grant Program of the New Energy and Industrial Technology Development Organization (NEDO), Japan, in 2002 and Grants-in-aids for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan. The support from CREST, Japan Science and Technology Agency is also acknowledged.
PY - 2006/11/25
Y1 - 2006/11/25
N2 - Effects of Co addition on the phase equilibria between the β (B2) and γ (A1) phases at 800 and 1000 °C and aging temperature dependence on the martensitic and magnetic transformation temperatures in Ni-Ga-Fe-Co alloys were examined with energy dispersion X-ray spectroscopy (EDX), differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM). The equilibrium compositions of Fe and Ga are little changed by the addition of Co, and Co tends to be distributed in the γ phase rather than in the β phase. The B2/L21 order-disorder and magnetic transformation temperatures increase with increasing Co content, while the martensitic transformation temperatures decrease. While the martensitic transformation temperatures monotonously decrease with decreasing aging temperature, the Curie temperature increases with the decrease of aging temperature in the high temperature region over 300 °C and then starts to decrease at low temperatures.
AB - Effects of Co addition on the phase equilibria between the β (B2) and γ (A1) phases at 800 and 1000 °C and aging temperature dependence on the martensitic and magnetic transformation temperatures in Ni-Ga-Fe-Co alloys were examined with energy dispersion X-ray spectroscopy (EDX), differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM). The equilibrium compositions of Fe and Ga are little changed by the addition of Co, and Co tends to be distributed in the γ phase rather than in the β phase. The B2/L21 order-disorder and magnetic transformation temperatures increase with increasing Co content, while the martensitic transformation temperatures decrease. While the martensitic transformation temperatures monotonously decrease with decreasing aging temperature, the Curie temperature increases with the decrease of aging temperature in the high temperature region over 300 °C and then starts to decrease at low temperatures.
KW - Ferromagnetic shape memory alloy
KW - Magnetic transformation
KW - Martensitic transformation
KW - Ni-Ga-Fe-Co alloy
KW - Order-disorder transformation
KW - Phase equilibrium
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U2 - 10.1016/j.msea.2006.02.080
DO - 10.1016/j.msea.2006.02.080
M3 - Article
AN - SCOPUS:33750453773
SN - 0921-5093
VL - 438-440
SP - 970
EP - 973
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - SPEC. ISS.
ER -