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对在较低温度范围的时效处理铁磁形状记忆合金Mn2NiGa的结构、相变和磁性进行了研究.研究发现,母相基体析出了细小的析出相,引起了晶格扭曲和畸变,导致了系统内产生了很大的内应力.在其浓度超过晶格的容忍度之后,提升了体系的马氏体相变温度,使母相在时效温度下转变成马氏体相,并在其中测量到高达900Oe的矫顽力.由于这种马氏体相的逆相变温度大幅提高,外推获得其居里温度在530K附近.细小析出相的粗化使内应力消失,样品又回到母相状态.观察到细小析出相粗化的两个阈值温度,分别为423K和485K.
The structure, phase transition and magnetism of the ferromagnetic shape memory alloy Mn2NiGa in aging treatment at lower temperature range were studied.The results show that the matrix phase precipitates fine precipitates and causes lattice distortions and distortion, A large internal stress is generated which increases the martensitic transformation temperature of the system after its concentration exceeds the tolerance of the crystal lattice so that the parent phase is transformed into a martensite phase at the aging temperature and measured Up to 900Oe coercive force due to the reverse phase transition temperature of this martensite phase increased significantly extrapolated to obtain its Curie temperature near 530K.The coarsening of the precipitated phase of small fine so that the internal stress disappears, the sample is back to the mother phase The two threshold temperatures for the coarsening of the precipitates were observed, 423K and 485K, respectively.