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在相平衡热力学计算的基础上,利用Scheil-Guilliver模型,计算了Nb-Si-Mo三元体系中不同成分合金的凝固途径。同时,根据Nb-Si-M(M=Ti、Mo、W、Al、Cr、B、Hf)三元系富Nb-M边的液相面投影图及相平衡关系,分析了各合金元素对Nb3Si相的稳定能力,以及对Nbss+Nb5Si3双相区的影响。计算结果与对应合金的显微组织分析相一致,表明相平衡分析有利于设计合金成分、模拟凝固过程、控制合金组织,对于Nb-Si基高温合金的设计与制备具有重要的指导意义。
Based on the phase equilibrium thermodynamic calculation, the Scheil-Guilliver model was used to calculate the solidification path of the alloys with different compositions in the Nb-Si-Mo ternary system. At the same time, according to the liquid phase surface projection of Nb-Si-M (M = Ti, Mo, W, Al, Cr, B, Hf) ternary Nb- Nb3Si phase stability, as well as Nbss + Nb5Si3 two-phase region. The calculated results are consistent with those of the corresponding alloys. It shows that the phase equilibrium analysis is of benefit to the design of the alloy composition, the simulation of the solidification process and the control of the alloy structure. It is of great significance to the design and fabrication of the Nb-Si based superalloy.