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采用合金平衡组织结构分析法,利用扫描电镜组织观察、能谱及电子探针微区成分分析、X射线衍射和透射电子衍射结构分析,对Nb-Ni-Ti系富Ni角1000℃的相平衡关系进行了研究。结果表明,1000℃时Nb-Ni-Ti系富Ni角存在一个成分约为10Nb-80Ni-10Ti(摩尔分数,%)的三元化合物XE;该三元化合物具有六方晶体结构,点阵参数为a=0.512nm和c=0.836nm;且可与Ni基固溶体相平衡。Ti的存在促进了Nb在γ-Ni中的溶解,1000℃时Nb在Ni基固溶体中的最大溶解度可达11.7%;Ti和Nb在γ-Ni中的总溶解度高达14.2%。
The balance of microstructure of Nb-Ni-Ti alloy with Ni angle of 1000 ℃ was studied by means of alloy equilibrium microstructure analysis, scanning electron microscopy (SEM) observation, energy dispersive spectroscopy and electron microprobe analysis, XRD and TEM. The relationship was studied. The results show that there exists a ternary compound XE with a composition of about 10Nb-80Ni-10Ti (mole fraction,%) at 1000 ℃. The ternary compound has a hexagonal crystal structure and the lattice parameters are a = 0.512 nm and c = 0.836 nm; and can be balanced with the Ni-based solid solution. The existence of Ti promotes the dissolution of Nb in γ-Ni. The maximum solubility of Nb in Ni-based solid solution is up to 11.7% at 1000 ℃. The total solubility of Ti and Nb in γ-Ni is as high as 14.2%.