Heusler型Mn2Ni(In,Sn,Ga,Sb)作为固态磁制冷材料受到越来越多的关注.采用单辊快速凝固技术制备出Mn50Ni41-xBixIn9(x=0,2)薄带材料,采用X射线衍射、扫描电镜、差热分析以及振动样品磁强计对其微观结构特征、相变行为及磁制冷性能进行了研究.结果表明,两种薄带材料低温马氏体相结构均为14层调制单斜结构,2at％的Bi元素替代Ni元素后,薄带材料马氏体结构相变温度有所下降,同时形成富Bi纳米颗粒析出相.Mn50Ni39Bi2In9薄带材料相比Mn50Ni41In9磁熵变制冷性能显著提升,主要是由于前者奥氏体相在马氏体相变之前发生了顺磁—铁磁转变,两相磁性差异加强所致.
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