Nb-Ti-Si基超高温合金的组织演化分析  

Microstructure Evolution of Nb-Ti-Si-based Superalloy

作　　者：莫灼宇 

机构地区：[1]重庆师范大学,重庆401331 [2]重庆商务职业学院,重庆400036

出　　处：《铸造技术》2014年第8期1654-1656,共3页Foundry Technology

摘　　要：研究了不同凝固速率下Nb-Ti-Si基新型超高温合金的组织演变。结果表明,Nb-Ti-Si基超高温合金由NbSS、α(Nb,X)5Si3和γ(Nb,X)5Si3组成。共晶胞的等效直径和共晶组织的层片间距随着凝固速率的增大而减小。定向凝固试样进入稳态区后的固/液界面演化过程为胞枝状→树枝状→胞枝状。The microstructure evolution of the Nb-Ti-Si-based superalloy under different solidification rates was investigated. The results show that the Nb-Ti-Si-based superalloy is made of NbSS, α （Nb, X）5Si3 and γ （Nb, X）5Si3. The equivalent diameter of the eutectic cell and the layer distance of the eutectic structure decreases with the increase of the solidification rate. The evolution process of the solid-liquid interface is from cellular dendrite to dendritic and to cellular dendrite again after that the directional-solidification alloy gets into steady region.

关 键 词：超高温合金 定向凝固 共晶胞 凝固速率 

分 类 号：TG132.3[一般工业技术—材料科学与工程]