研究了非化学计量成分的多晶Ni52Mn21+xGa27-x(x=0—5)系列合金的热弹性马氏体相变和磁相变. 合金的马氏体相变温度Ms随Mn含量的增加而升高, 当x＞4时, Ms已经升高到室温以上, 而马氏体相变滞后T随x的增大而减小; 合金的磁相变温度TC随x增加而升高, 但变化范围不大, 在x＞2后, TC保持在348 K左右. 实验获得了一种具有实用前景的合金成分---Ni52Mn25Ga23合金, 其马氏体相变温度在室温以上,相变滞后仅为5 K.
The martensitic and magnetic phase transformations in polycrystalline non-stoichiometric Ni52Mn21+xGa27-x(x=0-5) alloys were investigated. The experimental results show that the alloys exhibit ferromagnetic and thermo-elastic martensitic transformations. The martensitic transformation temperatures (Ms) increase with increasing Mn content and reach above room temperature when x>4. The martensitic transformation hysteresis (δT) decrease with increasing x. The magnetic phase transformation temperatures (Curie temperature TC increase with an increase of x within a small range and keep around 348 K when x>2. In addition, an alloy composition of Ni52Mn25Ga23 with potential practicality was obtained, which has a higher martensitic transformation temperature than room temperature and a transformation hysteresis of only 5 K.
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