THE BEHAVIOUR OF HELIUM ATOMS INJECTED INTO BERYLLIUM
Disks of extruded and cast beryllium were injected with helium by bombardment with alpha -particles in a cyclotron. Microscopic observation of the region at the end of the alpha -particle track shows that the helium contained there precipitates as gas bubbles only if the beryllium is heated to about 800 deg C, at which temperature the grain boundaries act as sources of the vacancies necessary for the precipitation. Further heating causes the bubbles, which are initially about 4 x 10/sup -6/ cm in diameter, to enlarge and to reduce in number resulting in acceleration at the grain boundaries. The large difference in grain size between the extruded and cast beryllium permits a lower temperature of precipitation and more rapid coarsening in the former. (auth)
- Research Organization:
- Atomic Energy Research Establishment, Harwell, Berks, Eng.
- NSA Number:
- NSA-14-002769
- OSTI ID:
- 4228809
- Journal Information:
- Reactor Sci., Journal Name: Reactor Sci. Vol. Vol: 10
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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