Fe的添加对NiTi形状记忆合金相变行为的影响（英文）

发布时间：2018-02-24 05:14

本文关键词： 形状记忆合金 NiTi合金 NiTiFe合金显微结构奥氏体马氏体　出处：《Transactions of Nonferrous Metals Society of China》2017年07期 　论文类型：期刊论文

【摘要】：制备了三种名义成分分别为Ni_(50)Ti_(50)、Ni_(49)Ti_(49)Fe2和Ni45Ti51.8Fe3.2(摩尔分数,%)的不同NiTi基合金来揭示Fe的添加对NiTi形状记忆合金相变行为的影响。采用光学显微分析法、透射电子显微分析法、X射线衍射和差示扫描量热法对这些合金的组织和相变行为进行分析。结果表明,Ni_(50)Ti_(50)合金的基体由B19′马氏体相和B2奥氏体相组成。而且,在B19′相中可以观察到孪晶亚结构。然而,三元NiTi Fe合金的组织则为B2奥氏体相。这两种合金的基体中弥散分布着大量的Ti2Ni沉淀相。NiTi形状记忆合金中添加Fe后导致三元合金的相变温度下降。由机理分析可以得到如下结论:这一现象主要是由原子的弛豫引起的,弛豫会导致相变过程中B2相的稳定化。
[Abstract]:Three kinds of NiTi based alloys with different nominal components, Nis / NiS / NiS / T / T / T / T / T / T / T / T and Ni _ 45Ti _ 51.8 / Fe _ 3.2 respectively, were prepared to reveal the effect of Fe addition on the phase transition behavior of NiTi shape memory alloys. Optical microanalysis was used to investigate the effect of Fe addition on the phase transition behavior of NiTi shape memory alloys, and the effect of Fe addition on the phase transition behavior of NiTi shape memory alloys was investigated by optical microanalysis. Transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) were used to analyze the microstructure and phase transformation behavior of these alloys. The results show that the matrix of the alloy consists of B19'martensite phase and B2 austenitic phase. Twin substructures can be observed in B19 'phase. However, The microstructure of ternary NiTi Fe alloy is B2 austenitic phase. A large amount of Ti2Ni precipitate phase. Niti shape memory alloy is dispersed in the matrix of these two alloys. The phase transformation temperature of the ternary alloy decreases after the addition of Fe. It is concluded that this phenomenon is mainly caused by the relaxation of atoms. Relaxation will lead to the stabilization of B2 phase in the process of phase transition.
【作者单位】：哈尔滨工程大学机电工程学院;哈尔滨工程大学材料科学与化学工程学院;
【基金】：Projects(51305091,51305092,51475101)supported by the National Natural Science Foundation of China Project(20132304120025)supported by Specialized Research Fund for the Doctoral Program of Higher Education,China
【分类号】：TG139.6

【参考文献】