研究了降Nb提Al对GH706合金组织和力学性能的影响.当合金中Al含量由0.35%提高至1.26%(质量分数,下同),Nb含量由2.88%降低至1.98%后,可抑制晶内主要强化相γ"-Ni3Nb相的析出,促进γ′-Ni3Al相的析出,显著降低合金的室温屈服强度,但明显改善了合金的室温冲击性能.同时提Al降Nb还抑制了晶界强化相η-Ni3(Ti,Nb)相的析出,使得富Nb的Laves相及富Nb、Cr的Cr2Nb相析出,弱化了高温下的晶界强度,极大地恶化了合金的持久性能.
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