Microstructures et Recristallisation
J. Phys. IV 05 (1995) C3-305-C3-310
Titanium Evolution and Nickel Restoration Under Neutron Irradiation in Ni/Ti MultilayersB. Ballot1, A. Menelle1, J. Mimault2, T. Girardeau2, F. Samuel3 and K. Al Usta3
1 Laboratoire Léon Brillouin, CEA-CNRS, Bât. 563, CE Saclay, 91191 Gif-sur-Yvette cedex, France
2 Laboratoire de Métallurgie Physique, URA 131 du CNRS, 40 avenue du Recteur Pineau, 86022 Poitiers cedex, France
3 Compagnie Industrielle des Lasers, B.P. 27, route de Nozay, 91460 Marcoussis, France
Ni/Ti multilayers are used as supermirrors for neutron guides. These multilayers are submitted to neutron irradiation. In order to determine the effect of irradiation on supermirrors performances we studied Ni/Ti multilayers irradiated with thermal neutrons. We present here the results obtained by neutron reflectivity, X-ray diffraction and EXAFS on one sample. It has been found that the supermirrors performances are not reduced. Nevertheless, Ti shows an evolution from the hcp structure to another crystalline state while Ni layers show a restoration of the fcc structure.
© EDP Sciences 1995