THE FORMATION OF HELIUM BUBBLES NEAR THE SURFACE AND IN THE BULK IN NICKEL DURING POST-IMPLANTATION ANNEALING

被引:76
作者
CHERNIKOV, VN
TRINKAUS, H
JUNG, P
ULLMAIER, H
机构
[1] Institut für Festkörperforschung der Kernforschungsanlage Jülich GmbH, Association Euratom-KFA, D-5170 Jülich
关键词
D O I
10.1016/0022-3115(90)90323-F
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A systematic TEM study on nickel specimens homogeneously implanted with about 1000 appm helium at room temperature and annealed for about 1 h between 873 and 1273 K is reported and interpreted. During annealing the observed bubble structure coarsens substantially. The coarsening rate is, however, much faster close to the surface than in the bulk. The apparent activation energies of the average bubble radius in these regions are 1.1 and 0.23 eV, respectively. Results from other investigations confirm and complete these findings. The enhanced coarsening near the surface is attributed to the relaxation of initially overpressurized bubbles by vacancies supplied by the nearby surface. The coarsening mechanism in this region is identified as Ostwald ripening. In the bulk, the latter is suppressed due to a reduction of the vacancy concentration by the overpressure in the bubbles. In this region bubble coarsening is attributed to coalescence via bubble migration controlled by surface diffusion. © 1990.
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页码:31 / 38
页数:8
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