中文摘要：

为了进一步改善材料的性能和探索新的材料，将Mn2NiGa合金中的Ni元素分别用Fe和Co替代，制备了Mn50Ni25-xFe（Co）xGa25系列合金。研究了Fe和Co元素对Mn2NiGa合金的结构、马氏体相变行为、磁性和机械性能等方面的影响。

英文摘要：

The ferromagnetic shape memory alloy Mn2 NiGa was developed recently. In order to improve the properties of this material and develop new ferromagnetic shape memory alloys, in this work an experiment of partially substituting Fe or Co for Ni in Mn2 NiGa alloys was carried out to examine the effect of Fe or Co in quaternary Mn50Ni25-xFe（Co）xGa25 alloys on their structure, magnetic properties, martensitic transformation, and mechanical properties. Some interesting results were presented in this paper.