Materials

Abstract

The technique of x-ray projection microscopy is being used to view, m real time, the structures and dynamics of the solid-liquid interface during solidification. By employing a hard x-ray source with sub-micron dimensions, resolutions of 2 lain c_ be obtained with magnifications of over 800 X. Specimen growth conditions need to be optimized and the best imaging technologies applied to maintain x-ray image resolution, contrast and sensitivity. It turns out that no single imaging technology offers the best solution and traditional methods lflce radiographic film cannot be used due to specimen motion (solidification). In addition, a special fursace design is required to permit controlled growth cosditions and still offer maximum resolution and image contrast.