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错配度

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错配度

张博文¹，张晓娜^1*，刘程鹏¹，于涛²，李晖^1*,王崇愚^2,3，张泽⁴

( 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)

摘 要  镍基单晶高温合金中g相和g'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g相和g'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。

关键词  镍基单晶高温合金；晶格常数；错配度；会聚束衍射(CBED)

中图分类号：TG132.3⁺2；TG115.23；TG115.21⁺5.3文献标识码：A    doi:10.3969/j.issn.1000-6281.2019.06.005

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

ZHANG Bo-wen¹，ZHANG Xiao-na^1*，LIU Cheng-peng¹，YU Tao²，LI Hui^1*，WANG Chong-yu^2，3，ZHANG Ze⁴

（1.Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124；2.Central Iron ＆Steel research Institute, Beijing 100081；3 Department of Physics, Tsinghua University, Beijing 100084；3.Department of Material Science and Engineering，Zhejiang University，Hangzhou Zhejiang 310027，China）

Abstract    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 thesimulation resultsofhigher-order Laue zone(HOLZ) lines, the crystal lattice constants of  phase and  phasein the Ni-Al binary model superalloy were determined by convergent beam electron diffraction (CBED) method. The crystal latticemisfitwas calculated and the data from different locations differ slightly. Our results provided important fundamental data for understanding therelationshipbetweenmicrostructure changeandpropertiesin the service process

Keywords    nickel-based single crystal superalloy；crystal lattice constant；misfit；CBED

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