Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7882696 | Acta Materialia | 2014 | 11 Pages |
Abstract
In order to study the effects of 14 MeV neutron irradiation on materials used in the first walls of future fusion reactors, high-purity iron was ion-irradiated with and without helium in the JANNuS facility. Thin foils of high-purity iron were dual-beam irradiated in situ in a transmission electron microscope using 1 MeV Fe+ and 15 keV He+ ions. Several important results regarding dislocation loops and helium bubbles were obtained. For example, it was demonstrated that dislocation loops with a0 ã0 1 0ã type Burgers vectors are glissile and can move and eliminate at the surface of the thin foil at 500 °C. A comparison of irradiations with and without helium showed that helium atoms reduce the mobility of dislocation loops in pure iron irradiated at 500 °C. Also, we demonstrated that the heterogeneous formation of bubbles inside dislocation loops found previously is also present for helium implantation rates of â¼80 atomic parts per million (appm) He/displacements per atom (dpa).
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Daniel Brimbal, Brigitte Décamps, Jean Henry, Estelle Meslin, Alain Barbu,