对第三代镍基高温合金中γ/γ′和γ/Laves 金属间化合物随合金中 Ti、Al、Nb 含量的变化的定量关系进行研究。结果表明，当合金(3GSA-HNM-1合金)含9.8%(质量分数)(Ti+Al)时，其生成的共晶化合物含量最高可达41.5%，这种高含量的共晶化合物会导致合金的铸造能力降低。对3GSA-HNM-2合金(含γ-7.6%(Ti+Al)和1.5%Nb)，随(Ti+Al)含量的降低，生成的共晶化合物种类和形貌均发生了变化，数量也显著减少，可预计其铸造能力会得到改善。对3GSA-HNM-3合金(含γ-5.7%(Ti+Al))，随着 Nb 含量的增加，生成的 Laves 相数量减少，虽然程度有所降低。因此，对含2.9% Nb 的3GSA-HNM-3合金(γ-5.7%(Ti+Al))，由于生成的共晶化合物数量最少(4.7%)，其可铸造能力最好。
A quantitative relation between the γ/γ′ and γ/Laves intermetallics was investigated with the change of chemical composition, i.e., Ti, Al and Nb in the third generation of nickel-based superalloys. The results demonstrated that the maximum amount of intermetallic eutectics (i.e., 41.5%, mass fraction) has been formed in 9.8% (Ti+Al). It is predicted that high level of intermetallics formed in the 3GSA-HNM-1 (γ-9.8%(Ti+Al)) deteriorates its castability. The type and morphology of eutectic intermetallics change and the amount considerably diminishes by decreasing Ti+Al in 3GSA-HNM-2 (γ-7.6%(Ti+Al), 1.5% Nb). Thus, it is predicted that the castability for the 3GSA-HNM-2 improves. The amount of Laves intermetallics shows an ascending behavior again, however, with less intensity by increasing the Nb content in the 3GSA-HNM-3 (γ-5.7%(Ti+Al), 2.9% Nb). It can be concluded that for 3GSA-HNM-3 with composition of γ-5.7%(Ti+Al) and 2.9% Nb, the optimized castability can be anticipated, because the minimum amount of eutectic intermetallics (i.e., 4.7%) is formed.
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