铸态和锻态Ni47Ti44Nb9合金的热诱发马氏体相变
Thermally Induced Martensitic Transformation of As-cast and As-forged Ni47Ti44Nb9 Alloy
摘 要
采用差示扫描量热仪（DSC）、X射线衍射仪（XRD）、光学显微镜（OM）和扫描电子显微镜（SEM）等设备，对比研究了铸态和锻态Ni47Ti44Nb9合金热诱发马氏体相变及其逆转变的特征，分析了显微组织对相变过程的影响机理。结果表明：铸态合金由尺寸较大的初生NiTi相、共晶相（细小NiTi相+β-Nb相）以及分布在共晶区的（Ti，Nb）2Ni相组成，锻造后合金中的β-Nb相和（Ti，Nb）2Ni相弥散分布在NiTi基体相中；铸态合金中初生NiTi相和共晶NiTi相间的铌含量不同及化学成分偏析造成了相变峰和逆转变峰呈宽而扁的特征；经锻造后，NiTi相得到细化，合金的成分更加均匀，其相变峰和逆转变峰呈窄而尖的特征。
热诱发马氏体相变
铸态
锻态
NiTiNb shape memory alloy
thermally induced martensitic transformation
as-cast
as-forged
Abstract
The characteristics of thermally induced martensitic transformation and the reverse transformation of as-cast and as-forged Ni47Ti44Nb9 alloy were studied and compared by using differential scanning calorimetry (DSC), X-ray diffraction (XRD), optical microscopy (OM) and scanning electronic microscopy (SEM), and the influence mechanism of microstructure on phase transformation was analyzed. The results show that the as-cast alloy was composed of large primary NiTi phase, eutectic phase (fine NiTi phase and β-Nb phase) and (Ti,Nb)2Ni phase distributed in the eutectic area. β-Nb phase and (Ti,Nb)2Ni phase of the alloy after forging diffusely distributed in the matrix of NiTi phase. The phase transformation peaks and reverse transformation peaks of as-cast alloy were wide and flat because of the compositional segregation and the difference of Nb content in primary and eutectic NiTi phases. NiTi phase became fine and the chemical composition became more homogeneous after forging and thus resulted in the narrowness and sharpness of the phase transformation peaks and reverse transformation peaks.
中图分类号 T139 DOI 10.11973/jxgccl201803004
所属栏目 试验研究
基金项目 中国工程物理研究院科学技术发展基金资助项目（2015B0302060）；四川省科技厅应用基础项目（2017JY0319）
收稿日期 2017/1/16
修改稿日期 2017/12/13
网络出版日期
作者单位点击查看
备注孟玉堂(1983-),男,四川巴中人,工程师,硕士研究生
引用该论文: MENG Yutang,ZHANG Yonghao,SUN Mingyan,FAN Qichao,HUANG Shuke,WEI Qilong. Thermally Induced Martensitic Transformation of As-cast and As-forged Ni47Ti44Nb9 Alloy[J]. Materials for mechancial engineering, 2018, 42(3): 24～27
孟玉堂,张永皞,孙明艳,范啟超,黄姝珂,魏齐龙. 铸态和锻态Ni47Ti44Nb9合金的热诱发马氏体相变[J]. 机械工程材料, 2018, 42(3): 24～27
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参考文献
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【2】杨冠军,邓炬.Ti-Ni-Nb宽滞后记忆合金的研究进展[J].稀有金属材料与工程, 1998, 27(6):322-326.
【3】王利明,郑玉峰,蔡伟,等. Ni-Ti-Nb宽滞后形状记忆合金研究进展及其应用[J]. 宇航材料工艺, 2000, 30(3):5-10.
【4】PIAO M, MIYAZAKI S, OTSUKA K, et al. Effects of Nb addition on the microstructure of Ti-Ni alloys [J]. Materials Transactions, JIM, 1992, 33(4):337-345.
【5】杨冠军,郝士明.合金成分对Ti-Ni-Nb合金相变特性及形状记忆效应的影响[J]. 稀有金属材料与工程, 1996, 25(5):30-33.
【6】JANI J M, LEARY M, SUBIC A, et al. A review of shape memory alloy research, applications and opportunities [J]. Materials & Design, 2014, 56(4):1078-1113.
【7】HAMILTON R F, LANBA A, OZBULUT O E, et al. Shape memory effect in cast versus deformation-processed NiTiNb alloys[J]. Shape Memory Superelasticity, 2015,1(2):117-123.
【8】SHI H, FRENZEL J, SCHRYVERS D. EM characterization of precipitates in as-cast and annealed Ni45.5Ti45.5Nb9 shape memory alloys[J]. Materials Science Forum, 2013,738/739:113-117.
【9】TOSETTI J P, SILVA D G A, OTUBO J. Microstructure evolution during fabrication of Ni-Ti-Nb SMA wires[J]. Materials Science Forum, 2014,775/776:534-537.
【10】何向明,戎利建,闫德胜, 等.形变对Ti44Ni47Nb9宽滞后形状记忆合金应力诱发马氏体相变行为的影响[J].金属学报, 2004, 40(7):721-725.
【11】SHU X Y, LU S Q, LI G F, et al. Nb solution influencing on phase transformation temperature of Ni47Ti44Nb9 alloy[J]. Journal of Alloys and Compounds, 2014, 609:56-161.
【12】UCHIDA K, SHIGENAKA N, SAKUMA T, 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.
【13】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(12):939-942.
【14】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.
【15】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.
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