AVS 49th International Symposium
    Surface Engineering Tuesday Sessions
       Session SE+NS-TuM

Paper SE+NS-TuM8
Response of Nanocrystalline Materials to Ion and Neutron Irradiation

Tuesday, November 5, 2002, 10:40 am, Room C-111B

Session: Nanocomposite and Nanolayered Coatings
Presenter: M.-J. Caturla, Lawrence Livermore National Laboratory
Authors: A. Kubota, Lawrence Livermore National Laboratory
M.-J. Caturla, Lawrence Livermore National Laboratory
T. Diaz de la Rubia, Lawrence Livermore National Laboratory
B.D. Wirth, Lawrence Livermore National Laboratory
Correspondent: Click to Email
Plasma-facing materials are generally exposed to a harsh radiation environment. Radio-frequency excited plasmas under biased conditions produce energetic ion radiation which can lead to material damage and erosion at the surface. In fusion plasma applicat ions however, materials face significant bulk defect production and damage due to deeply penetrating 14 MeV neutrons and Helium nuclear reaction products, leading to embrittlement and void swelling. We discuss results of computational simulations to asses s the feasibility of high grain-boundary-density nanocrystalline materials in fusion environments. The performance of the nanocrystalline metals is discussed in terms of defect migration to and annihilation at the grain boundaries, as well as Helium migration along the grain boundary network.