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| * all images with kind permission of the authors |
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Spherulitic formation in cast iron with spherulitic graphite, polished.
Specimen preparation and image interpretation:
Dr. H.-L. Steyer, Kesselsdorf. Germany.
Advanced Darkfield:
Darkfield illumination reveals unevenesses in the surface (such as phase boundaries between graphite and matrix or break-outs). Spherulites here become obvious in shape and quality of preparation. Structures within the spherulites can be well observed. Starting from the seed crystal the graphite segments grew in a preferred direction. Other spherulites show bright lighting areas due to incomplete preparation or burst graphite particles. |