镍基合金中γ′相直线排列形貌的形成机制研究  

Study on the Formation Mechanism of Linear Arrangedγ′Phase Particles in Nickel-base Superalloy

作　　者：师梦杰 毛强 郑合凤 王常帅[2] 周兰章[2] 李慧[1] SHI Mengjie;MAO Qiang;ZHENG Hefeng;WANG Changshuai;ZHOU Lanzhang;LI Hui(Key Laboratory for Microstructures, Shanghai University, Shanghai 200444, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016, China)

机构地区：[1]上海大学微结构重点实验室,上海200444 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《上海金属》2021年第1期77-82,共6页Shanghai Metals

基　　金：国家重点研究发展计划(No.2016YFB0700401)。

摘　　要：利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电子背散射衍射(EBSD)技术研究了GH984镍基高温合金时效过程中析出的第二相的形貌。结果表明:晶界附近析出的针状η相与基体具有以下取向关系:{111}γ∥{0001}η,[011]γ∥[21-1-0]η。弥散分布的球状γ′相为L12立方结构,与基体具有以下取向关系:{100}γ∥{100}γ′,[011]γ∥[011]γ′。除了弥散分布外,γ′相在η相尖端还呈直线分布。根据试验结果,可以认为γ′相在共格孪晶界上析出是其呈直线排列的主要原因。Morphology of secondary phase precipitated in the GH984 nickel-base superalloy during aging treatment was investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM)and electron backscatter diffraction(EBSD).The results showed that the needle-likeηphase precipitated near the grain boundary bore such orientation relationship withγmatrix as{111}γ∥{0001}η,[011]γ∥[21-1-0]η.The dispersively distributed sphericalγ′phase was a L12 structure,which bore such orientation relationship with the matrix as{100}γ∥{100}γ′,[011]γ∥[011]γ′.Besides disperse distribution,theγ′phase near the tip ofηphase also presented linear distribution.Based on the experimental results,it can be believed thatγ′phase precipitating at the coherent twin boundary resulted in its linear arrangement.

关 键 词：γ′相 Η相 晶界 孪晶界 镍基高温合金 

分 类 号：TG1[金属学及工艺—金属学]