研究了含Hf镍基粉末高温合金在长期时效处理过程中γ'相形态的演化过程.结果表明: 合金在高温长期处理过程中立方状γ'相发生分裂,呈现出二重平行状和八重小立方体组态, 八重小立方体组态作为择优形态不再发生分裂, 处于低能稳定状态. 不同Hf含量合金的错配度发生明显变化, γ'相的长大或粗化过程可以粗略地分为“界面控制”和“应变控制”2个阶段, γ'相间弹性相互作用能对合金中析出相的形态变化起着重要作用.
The cubic γ′ particle morphology evolution was studied during long time aging process in a powder metallurgy (P/M) Ni–based superalloy with Hf addition. The results show that, during long time aging process, the cubic γ′ particle splits into a doublet of plantes or an octet of cubes. The octet of cubes with low energy is a preferred shape, it splits no longer. The γ/γ′ lattice misfit varies with different Hf contents. The growth or coarsening process of γ′ precipitate can be roughly divided into interface controlling and strain controlling stages, the γ′ precipitate morphology is greatly influenced by the elastic interaction energy between γ′ particles.
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