Hf含量对镍基粉末高温合金中γ′相形态的影响  

EFFECT OF HAFNIUM CONTENT ON MORPHOLOGY EVOLUTION OF γ' PRECIPITATES IN P/M Ni-BASED SUPERALLOY

作　　者：张义文[1,2] 王福明[1] 胡本芙[3] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]钢铁研究总院高温材料研究所,北京100081 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属学报》2012年第8期1011-1017,共7页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展计划项目2010CB631204;中俄政府间科技合作项目CR14-20资助~~

摘　　要：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 Y1particle 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 Y1 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 Y/Y1 lattice misfit varies with different Hf contents. The growth or coarsening process of Y1 precipitate can be roughly divided into interface controlling and strain controlling stages, the Y1 precipitate morphology is greatly influenced by the elastic interaction energy between Y1 particles.

关 键 词：粉末高温合金 Nia(A1 Ti) Y1相形态稳定性 

分 类 号：TG113.12[金属学及工艺—物理冶金]