Abstract
The principles of high resolution microradiography have been applied to a technique for the in situ observation of the solidification of alloys. The apparatus described allows a 300 mu m thick aluminium alloy to be melted and solidified at a controlled rate in a graphite crucible which is resistance heated. Variations in the degree of absorption of the X-ray beam which is passed through the alloy reflect changes in composition that occur on solidification. The growth features revealed in this way are recorded either on film or observed directly using a television camera that incorporates an X-ray sensitive vidicon tube. Two examples are given of the type of result obtained.
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