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

这项研究结合了实验和理论方法， 研究相干层间滑移传输机制 金属间化合物的相间边界。 单晶 钛铝化物，TiAl和Ti 3Al，机械生长， 测试，并将结果与理论预测进行比较， 位错芯结构和位错的相互作用 有相间的边界。 界面的计算机建模 在铝化物相之间的反应与 位错计算 合金的显微组织为： 通过扩散结合和/或扩散 浸润这些金属间化合物的断裂机制 材料进行评估。 压缩试验，透射电子 显微镜和原子力显微镜。 %%% 这项研究推进了原子建模的前沿， 模拟界面和理解机械行为， 具有重要技术意义的高温金属间合金。

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.