Abstract
The existence of three dimensional defects, voids, is confirmed in quenched pure aluminum with an electron microscope. Influences of other defects on the formation of voids and dislocation loops are examined. Specific conditions of quenching temperature, quenching rate, aging temperature, and specimen size for the formation of voids and dislocation loops are determined experimentally. The differences in the type of secondary defects and in their size and density are explained from the size of migrating defects which changes with quenching rate and quenching temperature, and from the growth ability of the nuclei which changes with shape and aging temperature. Local irregularity of the distribution of the secondary defects is also explained. The effect of quenching stress is considered.
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