Magnetic and martensitic transformations of NiMnX(X=In,Sn,Sb) ferromagnetic shape memory alloys
Magnetic and martensitic transformations of NiMnX(X=In,Sn,Sb) ferromagnetic shape memory alloys
复制标题
DOI：
10.1063/1.1808879
复制
发表时间：
2004-11-08
影响因子：
4
通讯作者：
Oikawa, K
中科院分区：
文献类型：
--
作者：
Sutou, Y;Imano, Y;Oikawa, K
采用差示扫描量热法和振动样品磁强法研究了Heusler Ni50Mn50-yXy （X=In， Sn和Sb）合金的马氏体和磁相变。在所有这些合金体系中，具有铁磁状态的奥氏体相转变为马氏体相，这意味着这些Heusler合金具有作为无ga铁磁形状记忆合金（fsma）的潜力。此外，在所有这些合金体系中都发生多重马氏体相变，如两步或三步马氏体相变。透射电镜观察证实，马氏体相的晶体结构为正交四层结构，这在其他fsma中未见报道。因此，目前的无ga fsma极有可能出现较大的磁场诱发应变。(C) 2004年美国物理研究所。
Martensitic and magnetic transformations of the Heusler Ni50Mn50-yXy (X=In, Sn and Sb) alloys were investigated by differential scanning calorimetry measurement and the vibrating sample magnetometry technique. In all these alloy systems, the austenite phase with the ferromagnetic state was transformed into the martensite phase, which means that these Heusler alloys have potential as Ga-free ferromagnetic shape memory alloys (FSMAs). Furthermore, multiple martensitic transformations, such as two- or three-step martensitic transformations, occur in all these alloy systems. It was confirmed by transmission electron microscopy observation that the crystal structure of the martensite phase is an orthorhombic four-layered structure which has not been reported in other FSMAs. Therefore, the present Ga-free FSMAs have the great possibility of the appearance of a large magnetic-field-induced strain. (C) 2004 American Institute of Physics.