Abstract
Studies on recrystallization temperature of commercial purity magnesium prepared by vacuum evaporation process and super high purity magnesium obtained by repeated vacuum evaporation, were carried out by X-ray analysis.Influences on recrystallization temperature of working degree, purity of magnesium, working temperature, annealing time and temperatute, crystal grain size before working and aging at room temperature were investigated.Results obtained were as follows:1) Recrystallization temperature didn't much vary according to the working degree above 10%.2) The beginning and the end temperature of recrystallization of the re-evaporated high purity magnesium were the lowest; 75°-100°C and 208°-225°C respectively. Those of the commercial purity magnesium were the highest.3) The beginning temperature of recrystallization of evaporated high purity magnesium worked at 200°C was 150°-175°C and the same specimen workcd at 400°C recrystallized while working operation.4) Relation between the reciprocal of the absolute annealing temperature and the logarithm of the annealing time was linear in three kinds of pure magnesium.5) The recrystallization temperature of the specimens having average large crystal grain before working was higher than that having small grain.6) The recrystallization of re-evaporated high purity magnesium began for the first time after aging for 100 days at room temperature.
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