Effects of Ternary Trace Additions on the Interfacial Structure and Growth Kinetics of Precipitate Plates in Substitutional Alloys

三元微量添加对替代合金中沉淀板界面结构和生长动力学的影响

• 批准号: 8915770
• 负责人: James Howe
• 金额: $ 6.54万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-15 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915770&HistoricalAwards=false
• 关键词: Effects; Ternary; Trace; Additions; Interfacial

This research is an experimental program employing quantitative transmission electron microscopy and theoretical analyses to clarify the mechanisms of precipitate nucleation and growth in model alloy systems. The role of ternary additions in affecting growth is emphasized. Defect density, solute segregation, ledge growth, and precipitate morphology and spacing are analyzed to reveal effects of systematic changes in ternary alloying additions and aging treatments. In-situ high resolution electron microscopy is employed to show atomic growth mechanisms based on dislocation ledges and to quantify interphase boundary motion.

本研究采用定量透射电镜和理论分析的方法，阐明了模型合金体系中析出相的形核和生长机理。强调了三元添加剂在影响生长中的作用。分析了缺陷密度、溶质偏析、边缘生长、析出相形态和间距，揭示了三元合金添加量和时效处理系统变化的影响。采用原位高分辨率电子显微镜观察了基于位错边缘的原子生长机制，并量化了相间边界运动。