CAJ | 학술논문

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.
채용소묘전성현미기술(SEAM)연구Ni55Mn20.6Ga24.4철자형상기억합금적마씨체변체정체주여철자주적미관결구급기우합.매개정립내부도존재조상적마씨체련생변체,병정현전형적자협작조태.이용SEAM독특적아표면성상능력,결합Bitter분문법원위대비료마씨체변체여자주적상호관계,발현마씨체변체여자주구유량호적중합성.이용SEAM화MFM량충기술증명료저개결론.해결과대진일보리해자주화마씨체변체정체주적상호관계유중요의의.
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.