Dislocation Core Structure and Slip Transmission Across Interphase Boundaries in Intermetallic Compounds

金属间化合物中位错核心结构和跨相间边界的滑移传输

• 批准号: 9219089
• 负责人: Vaclav Vitek
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219089&HistoricalAwards=false
• 关键词: Dislocation; Core; Structure; Slip; Transmission

This research combines experimental and theoretical approaches to investigate mechanisms of slip transmission across coherent interphase boundaries in intermetallic compounds. Single crystal titanium aluminides, TiAl and Ti3Al, are grown, mechanically tested, and the results compared to theoretical predictions of dislocation core structures and the interaction of dislocations with interphase boundaries. Computer modeling of the interface between the aluminide phases is carried out in parallel with the dislocation calculations. The microstructures of the alloys are varied by combinations of diffusion bonding and/or diffusive infiltration. The fracture mechanisms in these intermetallic materials are assessed. Compression testing, transmission electron microscopy, and atomic force microscopy are employed. %%% This research advances the frontiers of atomistic modeling for simulating interfaces and understanding of mechanical behavior in high temperature intermetallic alloys of technological importance.

本研究采用实验和理论相结合的方法，研究金属间化合物中滑移跨相界面的传输机制。对TiAl和Ti3Al单晶TiAl进行了生长和力学测试，并与位错核结构和位错与相界相互作用的理论预测进行了比较。铝化物相界面的计算机模拟是与位错计算并行进行的。扩散连接和/或扩散渗透的组合使合金的微观组织发生变化。对这些金属间化合物材料的断裂机制进行了评估。采用了压缩测试、透射电子显微镜和原子力显微镜。这项研究为模拟界面和理解高温金属间化合物合金的力学行为开辟了原子模拟的前沿，具有重要的技术意义。