Abstract
Using the molecular dynamics method, the stability of small He-vacancyclusters is studied under the condition of the high He and low vacancydensities. The result shows that there is a competition between He atomsdetrapped and self-interstitial atoms (SIAs) emitted during theclustering of He atoms. When the He number is above a critical value of9, the SIA emission is predominant. The SIA emission can result in deepcapture of He atoms since the binding energy of He to a He-vacancycluster is increased with the number of SIAs created. The cluster thusgrows up. In addition, more SIAs are created when the temperature iselevated. The average volume of a He atom is increased. The clusterexpansion takes place at high temperature.
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