Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第3期    总第180期    2014年3月

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文章编号:1004-0609(2014)03-0758-07
铁磁形状记忆合金Mn2+xNiGa的室温组织结构特征
马晓东1,杜志伟1,刘恩克2,吴光恒2,韩小磊1,付 新1,熊竟成1

(1. 北京有色金属研究总院 国家有色金属及电子材料分析测试中心,北京100088;
2. 中国科学院 物理研究所 磁学国家重点实验室,北京100190
)

摘 要: 采用X射线衍射分析与透射电子显微分析相结合的方法,对铁磁形状记忆合金Mn2+xNiGa(x=0, 0.02, 0.06)室温下微观组织结构进行研究。XRD结果表明:3种合金在室温下主要为奥氏体相。TEM以及HREM观察发现Mn含量对合金母相的微观组织形态有很大影响,在Mn2NiGa合金基体中存在Ni2In型六角结构的MnNiGa相;除存在MnNiGa相外,Mn2.02NiGa合金基体中还出现了少量层状无调制结构马氏体相;Mn2.06NiGa合金中不存在MnNiGa相,基体中有大量的无调制马氏体。HREM观察发现,3种合金在室温下都存在局域的晶格畸变,这种晶格畸变形成纳米尺度微畴,具有应变玻璃相的特征。

 

关键字: 铁磁形状记忆合金;Mn2NiGa;马氏体相变;显微组织

Microstructural characterization of ferromagnetic shape memory alloys Mn2+xNiGa at room temperature
MA Xiao-dong1, DU Zhi-wei1, LIU En-ke2, WU Guang-heng2, HAN Xiao-lei1, FU Xin1, XIONG Jing-cheng1

1. National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Abstract:The microstructures of the ferromagnetic shape memory alloys Mn2+xNiGa (x=0, 0.02, 0.06) at room temperature were investigated by X-ray diffractometry and TEM. XRD results show that the main phases of all the three alloys are austenites. By TEM and HREM, remarkably various microstructures can be found in Mn2+xNiGa alloys with different contents of Mn element. Ni2In-type hexagonal MnNiGa phase is found in the Mn2NiGa alloy. Beside MnNiGa phase, a few of layered non-modulated martensites appear in matrix of Mn2.02NiGa alloy. Non-modulated martensites appear conspicuously in Mn2.06NiGa alloy, meanwhile, MnNiGa phase disappears in this alloy. By HREM observation, the local lattice distortions which form nano-scaled domains with a characteristic of strain glass are found in the austenites of these three alloys at room temperature.

 

Key words: ferromagnetic shape memory alloy; Mn2NiGa; martensitic transformation; microstructures

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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