TY - JOUR
T1 - Martensitic and magnetic transformation behaviors in Heusler-type NiMnIn and NiCoMnIn metamagnetic shape memory alloys
AU - Ito, W.
AU - Imano, Y.
AU - Kainuma, R.
AU - Sutou, Y.
AU - Oikawa, K.
AU - Ishida, K.
N1 - Funding Information:
The present study was supported by a Grant-in-Aid from CREST, Japan Science and Technology Agency, Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT, Japan), and a ‘‘Collaborative Research’’ grant from the Center for Interdisciplinary Research, Tohoku University.
PY - 2007/4
Y1 - 2007/4
N2 - Martensitic and magnetic transformation behaviors of Ni50 MnIn, Ni45Co5MnIn, and Ni42.5 Co7.5MnIn Heusler alloys were investigated by differential scanning calorimetry (DSC), vibrating sample magnetometry (VSM), and transmission electron microscopy (TEM). The martensitic transformation starting temperature (Ms decreases with increasing In composition, while the Curie temperatures (Tc of the parent phase are almost independent in each alloy series. On the other hand, the addition of Co resulted in a decrease of the Ms and an increase of the Tc, and the degree of the decline of Ms was accelerated by magnetic transformation of the parent phase. The Ms temperature change induced by the magnetic field was also confirmed. It was found that the degree of Ms change is strongly related to the entropy change by the martensitic transformation, which shows a correlation with Tc -Ms. These behaviors can be qualitatively explained on the basis of thermodynamic considerations.
AB - Martensitic and magnetic transformation behaviors of Ni50 MnIn, Ni45Co5MnIn, and Ni42.5 Co7.5MnIn Heusler alloys were investigated by differential scanning calorimetry (DSC), vibrating sample magnetometry (VSM), and transmission electron microscopy (TEM). The martensitic transformation starting temperature (Ms decreases with increasing In composition, while the Curie temperatures (Tc of the parent phase are almost independent in each alloy series. On the other hand, the addition of Co resulted in a decrease of the Ms and an increase of the Tc, and the degree of the decline of Ms was accelerated by magnetic transformation of the parent phase. The Ms temperature change induced by the magnetic field was also confirmed. It was found that the degree of Ms change is strongly related to the entropy change by the martensitic transformation, which shows a correlation with Tc -Ms. These behaviors can be qualitatively explained on the basis of thermodynamic considerations.
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U2 - 10.1007/s11661-007-9094-9
DO - 10.1007/s11661-007-9094-9
M3 - Article
AN - SCOPUS:34347401840
SN - 1073-5623
VL - 38
SP - 759
EP - 766
JO - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
JF - Metallurgical Transactions A (Physical Metallurgy and Materials Science)
IS - 4
ER -