Abstract
The electron microscope has been used to observe the behavior of He gas bubbles in cold-worked Al-Li alloys upon post-irradiation heating. The bubbles appeared occasionally along the grain boundary in the Al-2.7w/0 Li specimen irradiated to 4.1×1019 n/cm2 and then heated to about 300°C. Upon heating to higher temperatures, up to 450 °C, the bubbles in the specimen grew along with the gradual growth of the recrystallized grains. When the bubbles reached sizes of 0.3~0.6 μ, upon heating to 500°C, the grain boundaries migrated, leaving the bubbles detached from them. In the Al-0.4w/0 Li specimen, the bubbles migrated out of the specimen surface, along with the grain boundary, upon heating to the temperatures above 450°C. The grain sizes of the irradiated Al-2.7w/0 Li specimen heated for 1 hr to 450°C were smaller than in unirradiated specimen heated for 1 hr to 400°C. In the displacement of grain boundary caused by grain growth, the gas bubbles are swept together to form larger bubbles until they reach a cer...
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