Hot-pressed samples were implanted with 650keV H+ ions to a dose of 6.7 x 1016/cm2 at temperatures below 50C. Transmission electron microscopic examinations were made of as-irradiated specimens and after post-irradiation annealing (400 to 600C, 0.25h). After irradiation, a high density of black-dot defects (about 5nm) was observed in the straggling ion zone; some of which were identified as being small dislocation loops. During post-irradiation annealing, the growth of dislocation loops and oriented gas-filled bubbles was observed in the damaged zone. The bubbles were markedly elongated along <00▪1> directions, and their side faces lay along {1¯1▪0} planes. These facets had a regular toothed surface, with facets on {1¯1▪0} planes. The size of these so-called teeth increased with annealing temperature, with their lengths growing faster than their widths.

Microstructural Study of Hydrogen-Implanted Beryllium. S.P.Vagin, P.V.Chakrov, B.D.Utkelbayev, L.A.Jacobson, R.D.Field, H.Kung: Journal of Nuclear Materials, 1998, 258-263, 719-23