Ferroic domain characterization of Ni_(55)Mn_(20.6)Ga_(24.4) ferromagnetic shape memory alloy  

Ni_(55)Mn_(20.6)Ga_(24.4)铁磁形状记忆合金的铁性畴结构表征(英文)

作　　者：宋红章[1] 曾华荣[2] 李永祥[2] 殷庆瑞[2] 胡行[1] 

机构地区：[1]郑州大学物理工程学院材料物理教育部重点实验室,郑州450052 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第9期2015-2019,共5页中国有色金属学报（英文版）

基　　金：Project(2009CB623305)supported by the National Basic Research Program of China;Project(50821004)supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China

摘　　要：The microstructure and coupling between structural and magnetic domains of ferromagnetic shape memory alloy Ni55Mn20.6Ga24.4 were investigated by scanning electron acoustic microscopy （SEAM）. Stripe ferroelastic domains （martensite variants） exist in every grain, and exhibit the configurations of the typical self-accommodation arrangement. Magnetic domain structure of Ni55Mn20.6Ga24.4 was observed by the Bitter method and magnetic force microscopy （MFM）. Due to the unique subsurface imaging capability of SEAM, combined with the Bitter method, the ferroelastic domain structure can be compared with in situ ferromagnetic domain structure. It is found that the martensitic variant boundaries coincide well with the ferromagnetic domain walls, which is beneficial for the understanding of the correlation between two kinds of ferroic domains.采用扫描电声显微技术(SEAM)研究Ni55Mn20.6Ga24.4铁磁形状记忆合金的马氏体变体晶体畴与铁磁畴的微观结构及其耦合。每个晶粒内部都存在条状的马氏体孪生变体,并呈现典型的自协作组态。利用SEAM独特的亚表面成像能力,结合Bitter粉纹法原位对比了马氏体变体与磁畴的相互关系,发现马氏体变体与磁畴具有良好的重合性。利用SEAM和MFM两种技术证明了这个结论。该结果对进一步理解磁畴和马氏体变体晶体畴的相互关系有重要意义。

关 键 词：ferroic domain ferromagnetic shape memory alloy scanning electron acoustic microscopy 

分 类 号：TG139.6[一般工业技术—材料科学与工程]