Abstract
The advent of medium and high-voltage transmission electron microscopes with point-to-point resolutions below 0.2 nm has made it possible to study transformation interfaces in metals at the atomic level. Understanding the atomic structures of these interfaces is critical to understanding microstructural development and the resulting physical and mechanical properties of metals. One area of transformation interfaces in metals that has been investigated by high- resolution transmission electron microscopy (HRTEM), is the structures of interphase boundaries of metastable aging precipitates in Al alloys. The presence of these precipitates is largely responsible for the high strengths of many Al alloys and the low atomic number of Al alloys makes them ideally suited for study by HRTEM. The results from HRTEM Investigations of transformation Interfaces in Al-2%LI-1%Cu and Al-4%Ag alloys which follow, illustrate the wealth of information that HRTEM can provide about transformation interfaces in metals.
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