Fe的添加对NiTi形状记忆合金相变行为的影响

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Bibliographic Details
Published in	中国有色金属学报：英文版 Vol. 27; no. 7; pp. 1580 - 1587
Main Author	张艳秋;江树勇;朱晓明;赵亚楠;梁玉龙;孙冬
Format	Journal Article
Language	English
Published	2017
Subjects	形状记忆合金;NiTi合金;NiTiFe合金;显微结构;奥氏体;马氏体
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ISSN	1003-6326

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Bibliography:	43-1239/TG shape memory alloy; NiTi alloy; NiTiFe alloy; microstructure; austenite; martensite Three different NiTi-based alloys,whose nominal compositions were Ni50Ti50,Ni49Ti49Fe2,Ni45Ti51.8Fe3.2(molefraction,%),respectively,were used in the current research to understand the influence of Fe addition on phase transformationbehavior in NiTi shape memory alloy(SMA).The microstructure and phase transformation behavior of the alloys were investigatedby optical microscopy(OM),transmission electron microscopy(TEM),X-ray diffraction(XRD)and differential scanningcalorimetry(DSC)analysis.The results show that the matrix of the Ni50Ti50alloy consists of both B19′(martensite)phase and B2(austenite)phase.Moreover,the substructures of twins could be observed in the B19′phase.However,the ternary alloys of NiTiFeexhibit B2phase in the microstructures.Such microstructures were also characterized by large presence of Ti2Ni precipitatesdispersed homogenously in the matrix of the two kinds of alloys.The addition of Fe to the NiTi SMA results in the decrease in phasetransformation temperatures in the ternary alloys.Based on mechanism analysis,it can be concluded that this phenomenon isprimarily attributed to atom relaxation of the distorted lattice induced by Ni-antisite defects and Fe substitutions during phasetransformation,which enables stabilization of B2phase during phase transformation.
ISSN:	1003-6326