使用会聚束电子衍射技术测定Ni-Al二元模型单晶高温合金γ/γ′两相错配度  

Determination of the crystal lattice misfit in Ni-Al binary single crystal model superalloy by convergent beam electron diffraction

作　　者：张博文 张晓娜[1] 刘程鹏[1] 于涛[2] 李晖[1] 王崇愚[2,3] 张泽[4] ZHANG Bo-wen;ZHANG Xiao-na;LIU Cheng-peng;YU Tao;LI Hui;WANG Chong-yu;ZHANG Ze(Institute of Microstructure and Property of Advanced Materials,Beijing University of Technology,Beijing 100124;Central Iron&Steel research Institute,Beijing 100081;Department of Physics,Tsinghua University,Beijing 100084;Department of Material Science and Engineering,Zhejiang University,Hangzhou Zhejiang 310027,China)

机构地区：[1]北京工业大学固体微结构与性能研究所,北京100124 [2]钢铁研究总院,北京100081 [3]清华大学物理系,北京100084 [4]浙江大学电子显微镜中心,材料科学与工程学院,浙江杭州310027

出　　处：《电子显微学报》2019年第6期608-614,共7页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.11874077)

摘　　要：镍基单晶高温合金中γ相和γ’相晶格错配度对两相晶界附近应力,服役过程中显微结构演变规律及抗蠕变性能都有重要影响。本文使用会聚束电子衍射方法,在精确测定透射电镜加速电压的基础上,结合计算模拟结果,测定了Ni-Al二元模型单晶高温合金中γ相和γ’相的晶格常数,获得了两相晶格错配度。合金中不同位置处两相晶格错配度差别较小。本文结果对深入了解高温合金显微结构的演变和性能的关系提供了重要的基础数据。The crystal lattice misfit is important for the phase interface,the microstructure change in service process and the creep property in superalloys.In this paper,based on the determination of the acceleration voltage of Transmission electron microscopy(TEM),comparing with the simulation results of higher-order Laue zone(HOLZ)lines,the crystal lattice constants of γ phase and γ′phase in the Ni-Al binary model superalloy were determined by conv ergent beam electron diffraction(CBED)method.The crystal lattice misfit was calculated and the data from different locatio ns differ slightly.Our results provided important fundamental data for understanding the relationship between microstructure change an d properties in the service process.

关 键 词：镍基单晶高温合金 晶格常数 错配度 会聚束衍射(CBED) 

分 类 号：TG132.32[一般工业技术—材料科学与工程] TG115.23[金属学及工艺—合金]