http://hdl.handle.net/10016/12941 2013-05-22T08:33:03Z 2013-05-22T08:33:03Z Martínez Gómez, Javier Savoini Cardiel, Begoña Monge Alcazar, Miguel Angel Muñoz Castellanos, Angel Pareja Pareja, Ramiro http://hdl.handle.net/10016/16619 2013-04-16T10:18:33Z 2011-09-30T22:00:00Z

Title: Development of oxide dispersion strengthened W alloys produced by hot isostatic pressing Author(s): Martínez Gómez, Javier; Savoini Cardiel, Begoña; Monge Alcazar, Miguel Angel; Muñoz Castellanos, Angel; Pareja Pareja, Ramiro Abstract: A powder metallurgy technique has been developed to produce oxide strengthened W-Ti and W-V alloys using elemental powders and nanosized powders of La(2)O(3) or Y(2)O(3) as starting materials. The alloys consolidated by hot isostatic pressing resulted in high-density materials having an ultrafine-grained structure and microhardness values in the range 7-13 GPa. Atom force microscopy studies show a topographic relief in the Ti and V pools that appear in the consolidated alloys. This relief is attributed to the heterogeneous nucleation of martensite plates. The preliminary transmission electron microscopy studies have revealed that a dispersion of nanoparticles can be induced in these alloys produced via the present technique. Description: Conference: 26th Symposium on Fusion Technology (SOFT) Location: Porto, Portugal. Date: 27 September-01 October, 2010

2011-09-30T22:00:00Z Castro, Vanessa, de Lozano-Perez, S. Marquis, E.A. Auger, Mª Angustias Leguey, Teresa Pareja, Ramiro http://hdl.handle.net/10016/12942 2012-01-12T23:26:42Z 2010-12-31T23:00:00Z

Title: Analytical characterisation of oxide dispersion strengthened steels for fusion reactors Author(s): Castro, Vanessa, de; Lozano-Perez, S.; Marquis, E.A.; Auger, Mª Angustias; Leguey, Teresa; Pareja, Ramiro Abstract: Reduced activation ferritic/martensitic and ferritic steels strengthened by a dispersion of oxide nanoparticles have been considered viable structural materials for fusion applications above 550uC. However, the microstructural stability and mechanical behaviour of these steels subjected to the aggressive operating conditions of these reactors are not well known. An accelerated development of these materials is crucial if they are going to be used in future power reactors. Then, it is indispensable to understand their atomic scale evolution under high temperature and irradiation conditions. The present paper reviews how the combination of transmission electron microscopy and atom probe tomography has been successfully applied for the characterisation of these steels at the near atomic scale, to reveal the nanoparticle structure, grain boundary chemistry and void distribution. Description: Special issue article

2010-12-31T23:00:00Z