Pr掺杂NiTi形状记忆合金的微观结构与相变特性  

Microstructure and phase transformation characteristics of Pr doped NiTi shape memory alloy

作　　者：赵石磊 赵昆[1] 王富文 ZHAO Shi-lei;ZHAO Kun;WANG Fu-wen(Baotou Medical College,Baotou 014040,China)

机构地区：[1]包头医学院,内蒙古包头014040

出　　处：《材料热处理学报》2021年第1期83-90,共8页Transactions of Materials and Heat Treatment

基　　金：内蒙古自然科学基金(2019BS03010);包头医学院博士科研启动基金(BSJJ201808)。

摘　　要：采用真空熔炼法向NiTi二元合金中掺杂稀土Pr元素,制备了多组分的Ni_(50)Ti_(50-x)Prx(x=0,0.1,0.3,0.5,0.7,0.9)合金。采用扫描电镜、X射线衍射仪以及能谱仪等研究了合金的微观结构和物相组成,采用差示扫描量热法测量了合金的相变温度。结果表明:添加稀土元素Pr的NiTiPr合金的组织由NiTi基体与NiPr夹杂相组成,随着Pr元素含量的增加,合金的马氏体相变温度降低,热滞增大。分析表明NiPr夹杂相周围的应力是导致NiTiPr合金相变温度与热滞变化的主要原因。The multicomponent Ni_(50)Ti_(50-x)Prx(x=0, 0.1, 0.3, 0.5, 0.7, 0.9) alloys were prepared by vacuum melting. Microstructure and phase composition of the alloys were studied by means of scanning electron microscopy, X-ray diffractometer and energy dispersive spectrometer analysis, and phase transformation temperature of the alloys was measured by differential scanning calorimeter. The results show that the microstructure of the NiTiPr alloys is composed of NiTi matrix and NiPr precipitates. With the increase of the content of Pr element, the start temperature of martensitic transformation of the alloys decreases and the thermal hysteresis increases. The analysis shows that the stress around the NiPr precipitates is the main cause of the change of phase transition temperature and thermal hysteresis of the NiTiPr alloys.

关 键 词：NITI形状记忆合金 稀土Pr元素 相变 微观结构 

分 类 号：TG139.6[一般工业技术—材料科学与工程]