Anomaly in entropy change between parent and martensite phases in the Ni50Mn34In16 Heusler alloy
Anomaly in entropy change between parent and martensite phases in the Ni50Mn34In16 Heusler alloy
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DOI：
10.1016/j.scriptamat.2008.08.022
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发表时间：
2009
影响因子：
6
通讯作者：
R. Umetsu;W. Ito;K. Ito;K. Koyama;A. Fujita;K. Oikawa;T. Kanomata;R. Kainuma;K. Ishida
中科院分区：
文献类型：
--
作者：
R. Umetsu;W. Ito;K. Ito;K. Koyama;A. Fujita;K. Oikawa;T. Kanomata;R. Kainuma;K. Ishida
研究了Ni50Mn34In16变磁形状记忆合金在高达18T的强磁场作用下诱发马氏体相变引起的磁变化。观察到马氏体相变的动力学停滞，并且马氏体相变在低于约100K的温度下不再进行。从磁化曲线计算的马氏体相和母相之间的相变熵变在80K左右由正变负。
Magnetic change due to the martensitic transformation induced by high magnetic fields up to 18T was investigated in the Ni50Mn34In16metamagnetic shape memory alloy. Kinetic arrest of the martensitic transformation was observed and the martensitic transformation no longer proceeded at temperatures below around 100K. The transformation entropy change between the martensite phase and parent phase evaluated from the magnetization curves showed an unusual behavior, changing from positive to negative at about 80K.