镍基单晶高温合金添加Ru对TCP相界面附近溶质元素输运特性影响的原子尺度研究

项目名称： 镍基单晶高温合金添加Ru对TCP相界面附近溶质元素输运特性影响的原子尺度研究

项目编号： No.51471098

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 张建新

作者单位： 山东大学

项目金额： 85万元

中文摘要： 本项目通过高分辨扫描透射电子显微镜(STEM)在原子尺度研究不同蠕变条件下镍基单晶高温合金几种典型的TCP相界面附近溶质元素的分布特征和相互作用的规律，通过对比确定元素Ru对复杂合金体系中TCP相前沿溶质元素扩散行为的具体影响，揭示溶质原子形成TCP相的交互作用特征；研究合金成分和服役条件对TCP相晶体结构和界面结构的影响规律及其对附近溶质原子运动行为产生作用的微观机制；借助于第一性原理计算和分子动力学模拟等方法分析高温合金中与TCP相形成有关的溶质原子扩散行为，阐明高温合金添加Ru对于溶质原子交互作用形成TCP相影响的物理本质。通过实验研究与理论模拟的综合分析，在原子尺度揭示高温合金成分-组织-性能之间的密切关系，逐步比较得出高温合金强化机理与缺陷控制理论。

中文关键词： 高温合金；蠕变；溶质原子；Ru；TCP相

英文摘要： This project is aimed to study the distribution and interaction of solute atoms on the atomic scale around typical TCP phases in nickel-base single-crystal superalloys under different creep conditions with the aid of scanning transmission electron microscopes (STEM). Effect of Ru addition on the diffusion behavior of solute atoms close to the TCP phases will be researched comparatively in the complicated multi-component alloy to reveal the interaction of solute atoms during the formation of TCP phases. Effect of composition and service conditions of the superalloys on the crystal structure and boundary of TCP phases as well as the related resultant motion of solute atoms close to the TCP phases will be clarified. A physical model for the migration of solute atoms close to the TCP phases will be given based on the experimental observation on the atomic scale. A computer simulation and analysis of the solute atomic migration related to the formation of TCP phases will be carried out according to the methods of first principles calculation, molecular dynamics simulation, etc to reveal the nature of the Ru addition. By comprehensive researches with atomic-scale experimental observation and theoretical analysis, the relationships among compositions, microstructures, and properties in superalloys will be rationalized. The strengthening mechanism and defect-control theory will be developed in superalloys based on the planned work.

英文关键词： superalloy;creep;solute atom;Ru;TCP phase