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采用真空非自耗电弧熔炼的方法制备了Nb-Si基超高温合金,分析了Ti含量对合金组织及相成分的影响规律。结果表明,合金中Ti含量对初生(Nb,X)_5Si_3的晶型及其尺寸和含量有明显影响。当Ti含量较低时(Oat%~10at%),初生硅化物为α-(Nb,X)_5Si_3;与未添加Ti的合金相比,含Ti合金的硅化物含量明显增加;当Ti含量为18at%~20at%时,初生硅化物为α-(Nb,X)_5Si_3和γ-(Nb,X)_5Si_3,但α-(Nb,X)_5Si_3的含量随着合金中Ti含量的增加而减少;当Ti含量为22at%~30at%时,初生硅化物仅为γ-(Nb,X)_5Si_3。随合金中Ti含量的增加,α-(Nb,X)_5Si_3的尺寸增大,但γ-(Nb,X)_5Si_3尺寸基本不变。Ti在Nbss和γ-(Nb,X)_5Si_3中的含量均随合金中Ti含量的增加而增加,但Ti在α-(Nb,X)_5Si_3中的含量较低且基本不随合金中Ti含量的增加而变化。
Nb-Si based superalloys were prepared by vacuum non-consumable arc melting method. The influence of Ti content on the microstructure and phase composition of the alloy was analyzed. The results show that the content of Ti in the alloy has a significant effect on the crystal form of the primary (Nb, X) _5Si_3 and its size and content. When the content of Ti is low (Oat% ~ 10at%), the primary silicide is α- (Nb, X) _5Si_3. Compared with the alloy without Ti, the content of silicide in Ti- However, the content of α - (Nb, X) _5Si_3 decreases with the increase of Ti content in the alloy at 18at% ~ 20at%, while the primary silicides are α- (Nb, X) _5Si_3 and γ- (Nb, X) _5Si_3 When the content of Ti is from 22 at% to 30 at%, the primary silicide is only γ- (Nb, X) _5Si_3. With the increase of Ti content in the alloy, the size of α - (Nb, X) _5Si_3 increases, but the size of γ - (Nb, X) _5Si_3 remains almost unchanged. The contents of Ti in Nbss and γ- (Nb, X) _5Si_3 all increase with the increase of Ti content in the alloy, but the content of Ti in α- (Nb, X) _5Si_3 is low and does not vary with the Ti content in the alloy Increase and change.