Investigation of the Recrystallization Behavior of Dilute Alloys of Magnesium and Chromium

摘要

An investigation into the recrystallization behavior of pure magnesium and some of its dilute binary alloys and pure chromium was made. Techniques for preparing thin foils of magnesium suitable for examination in the electron microscope were developed and photographs taken of dislocations, nucleation of dislocations and migrating grain boundaries. An x-ray technique was developed to measure the degree of recrystallization of magnesium and it was found that surface recrystallization played an important part in the recrystallization process. Activation energies determined for surface recrystallization in magnesium and its alloys range from 28 to 31 kilocalories per mole while that for bulk recrystallization was 20 kilocalories per mole. Determination of the percent recrystallization in pure chromium was done by a microscopic technique. The activation energy for the recrystallization of pure chromium (99.997%) was found to be 76 kilocalories per mole. (Author)