东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (7): 964-967.DOI: 10.12068/j.issn.1005-3026.2014.07.012

• 材料与冶金 • 上一篇    下一篇

Nb-Ni-Ti系低Ti侧三元化合物及其相平衡

李志超,李洪晓,任玉平,秦高梧   

  1. (东北大学 材料各向异性与织构教育部重点实验室, 辽宁 沈阳110819)
  • 收稿日期:2013-09-02 修回日期:2013-09-02 出版日期:2014-07-15 发布日期:2014-04-11
  • 通讯作者: 李志超
  • 作者简介:李志超(1989-),男,山东菏泽人,东北大学博士研究生;李洪晓(1968-),女,山东荣成人,东北大学教授;秦高梧(1970-),男,江苏盐城人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(50971037);辽宁省高校重点实验室支持计划项目(LS2010062).

Ternary Compound and Relative Phase Equilibria in the LowTi Side of NbNiTi System

LI Zhichao, LI Hongxiao, REN Yuping, QIN Gaowu   

  1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China.
  • Received:2013-09-02 Revised:2013-09-02 Online:2014-07-15 Published:2014-04-11
  • Contact: LI Hongxiao
  • About author:-
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摘要: 采用合金平衡组织结构分析法,利用扫描电镜组织观察和能谱成分分析、电子探针定量成分分析以及X射线衍射结构分析,并结合热分析,对Nb-Ni-Ti系低Ti侧化合物XB及其相关相平衡进行了研究.结果表明,在Nb-Ni-Ti三元系1000℃和1100℃等温截面相图中都存在着三相区XB+(Nb)+TiNi,化合物XB可与Nb基固溶体(Nb)和TiNi相保持固态相平衡直到约1133℃.Nb-Ni-Ti三元系在1133℃发生三相共晶转变LTiNi+XB;由于液相L的形成,XB相不再与TiNi相和Nb基固溶体平衡.1150℃时Nb-Ni-Ti三元系等温截面相图中存在着XB+(Nb)+L三相区,XB相与Nb基固溶体和液相平衡共存.

关键词: Nb-Ni-Ti系, 化合物, 共晶转变, 相平衡, 相图

Abstract: The phase transformation and phase equilibria related with the ternary compound XB in the lowTi side of NbNiTi system were systemically investigated through the equilibrated alloy method by using the scanning electron microscopy(SEM)assisted with energy dispersive spectroscopy of Xray(EDS), electron probe microanalysis(EPMA), Xray diffraction(XRD)and differential scanning calorimetry(DSC). It has been shown that the threephase field XB+(Nb)+TiNi exists at both 1000℃ and 1100℃ isothermal sections of the phase diagram in the NbNiTi system. The compound XB could be in solidstate equilibrium with the Nbbased solid solution(Nb)and the TiNi phase till about 1133℃. There exists the eutectic phase transformation LTiNi+XB at 1133℃ in the NbNiTi system. As the liquid forms, the compound XB could not be in equilibrium with the Nbbased solid solution and the TiNi phase. The threephase field XB+(Nb)+L exists at 1150℃ isothermal sections of the phase diagram in the NbNiTi system, XB keeps phase equilibrium with the liquid and the Nbbased solid solution.

Key words: NbNiTi system, compound, eutectic transformation, phase equilibrium, phase diagram

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