Nb含量对铸态Ni-Ti-Nb合金微观组织和马氏体相变的影响
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摘要
固定Ni含量,设计并制备了不同Nb含量的Ni-Ti-Nb合金,并采用差示扫描量热仪(DSC)、光学显微镜(OM)和扫描电镜(SEM)等方法对试样的热诱发马氏体相变行为和微观组织进行了研究。结果表明,随着Nb含量的增加,微观组织中共晶相的数量增加,热诱发马氏体相变峰由窄变宽直至无明显的热效应,相变温度也向低温方向移动。
As-cast Ni-Ti-Nb shape memory alloys with fixed Ni content and different Nb contents were designed and prepared. Differential scanning calorimetry(DSC), optical microscope(OM) and scanning electronic microscope(SEM) were used to research the thermal induced martensitic phase transformation and microstructure. The results indicate that with the increase of Nb addition, the numbers of eutectic phase in the microstructure increase. The peak of the thermal induced martensile phase transformation turns from narrowness to broadness, until it has unobvious heat effect, and the phase transformation temperatures shift to low temperature direction.
As-cast Ni-Ti-Nb shape memory alloys with fixed Ni content and different Nb contents were designed and prepared. Differential scanning calorimetry(DSC), optical microscope(OM) and scanning electronic microscope(SEM) were used to research the thermal induced martensitic phase transformation and microstructure. The results indicate that with the increase of Nb addition, the numbers of eutectic phase in the microstructure increase. The peak of the thermal induced martensile phase transformation turns from narrowness to broadness, until it has unobvious heat effect, and the phase transformation temperatures shift to low temperature direction.
引文
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[13]赵伟,李付国,孙燚,等.铸、锻两种状态下TiNiNb合金的热加工性能[J].稀有金属材料与工程,2011,40(5):892-896.
[2]Jani J M,Leary M,Subic A,et al.A review of shape memory alloy research,applications and opportunities[J].Materials&Design,2014,56:1078-1113.
[3]Shi H,Pourbabak S,Humbeeck J V,et al.Electron microscopy study of Nb-rich nanoprecipitates in Ni-Ti-Nb and their influence on the martensitic transformation[J].Scripta Materialia,2012,67:939-942.
[4]Sehitoglu H,Wu Y,Patriarca L.Shape memory functionality under multi-cycles in NiTiHf[J].Scripta Materialia,2017,129:11-15.
[5]Evirgen A,Karaman I,Santamarta R,et al.Microstructural characterization and superelastic response of a Ni50.3Ti29.7Zr20high-temperature shape memory alloy[J].Scripta Materialia,2014,81:12-15.
[6]Fu Xiao,Ma Guojun,Zhao Xinqing,et al.Effects of Nb content on yield strength of NiTiNb alloys in martensite state[J].Chinese Journal of Aeronautics,2009,22:658-662.
[7]Min P,Shuichi M,Kazuhiro O,et al.Effects of Nb addition o n the microstructure of Ti-Ni Alloys[J].Materials Transactions,1992,33(4):337-345.
[8]Shu X Y,Lu S Q,Li G F,et al.Nb solution influencing on phase transformation temperature of Ni47Ti44Nb9alloy[J].Journal of Alloys and Compounds 2014,609:56-161.
[9]Kazunari Uchida,Naoto Shigenaka,Toshio Sakuma,et al.Effect of Nb Content on martensitic transformation temperatures and mechanical properties of Ti-Ni-Nb shape memory alloys for pipe joint applications[J].Materials Transactions,2007,48(3):445-450.
[10]Reginald F,Hamilton D,Asheesh Lanba,et al.Tittmann shape memory effect in cast versus deformation-processed NiTiNb Alloys[J].Shap.Mem.Superelasticity,2015(1):117-123.
[11]Wang M,Jiang M,Liao G,et al.Martensitic transformation involved mechanical behaviors and wide hysteresis of NiTiNb shape memory alloys[J].Progress in Natural Science:Materials International,2012,22(2):130-138.
[12]杨亚卓,赵新青,孟令杰,等.低Nb含量Ni-Ti-Nb形状记忆合金的组织和相变特征[J].金属学报,2005,41(6):627-632.
[13]赵伟,李付国,孙燚,等.铸、锻两种状态下TiNiNb合金的热加工性能[J].稀有金属材料与工程,2011,40(5):892-896.