Abstract
The effects of nickel and/or zinc addition on microstructural evolution in copper during fast neutron irradiation have been examined for the purpose of investigating the effects of solid transmutant element generation in copper expected during fast or fusion neutron irradiations. The nickel addition effects at 647 K were very different from those at 683 K, the former being suppressive to swelling by reducing the void density and the latter being promotive by increasing the void size. The zinc addition caused significant enhancement of swelling by increasing the void size. The coaddition of nickel and zinc resulted in reduction of void swelling. Nickel was enriched strongly at voids or grain boundaries. The nickel addition effects may partly be attributed to the enhanced dislocation density. The zinc effects, on the other hand, may relate with property changes of vacancies or their clusters.
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