Abstract
A high-temperature X-ray Lang camera has been designed to examine metal single crystals with a low dislocation density during the heating or cooling processes. The furnace for the camera was set on a goniometer-hand, therefore the setting of specimen is only slightly restricted. The camera can be used to take a topograph at any temperature up to 500°C with desired heating or cooling run. The spatial gradient of temperature in the exposing area of the specimen is less than 1°C/mm, and the fluctuation of temperature during an exposure of about 30 hours is less than ±0.5°C. Using this camera, several topographs were taken during a heating process of high purity aluminum single crystal. As the result it was ascertained that a screw dislocation converts to a helical dislocation by the generation of vacancies during the heating process.
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