EFFECT OF TEMPERATURE DURING IRRADIATION ON THE BEHAVIOUR OF HELIUM IN ALUMINIUM
>The introduction of helium into metals by cyclotron alpha-particle irradiation is a particularly useful technique for determining vacancy sources in metals and understanding of inert-gas-bubble growth in general. The results given show that irradiation at elevated temperatures, as compared to low- temperature irradiation followed by heating, had no distinct effect on intragranular bubble growth but did result in enhanced growth of bubbles at grain boundaries. An example of helium bubble growth in aluminum irradtated at less than 50 deg C and subsequently heated for one hour at 500 deg C is presented. The enhanced bubble growth at grain boundaries can be explained on the assumption that the grain boundaries are highly preferred points of nucleation. Thus, helium moves to the grain boundaries from nearby regions, whereas on post- irradiation heating the intragranular material is so supersaturated that bubbles grow at once on less preferred nucleation points as well as at grain boundaries. Therefore, the location of helium-filled bubbles in neutron-irradiated beryllium will be dependent on metal temperature during irradiation. (N.W.R.)
- Research Organization:
- Atomic Energy of Canada Ltd., Chalk River, Ont.
- NSA Number:
- NSA-16-012193
- OSTI ID:
- 4806871
- Journal Information:
- J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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