{"id":16954,"date":"2018-03-09T09:04:48","date_gmt":"2018-03-09T09:04:48","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/defectos-superficiales-en-au001-generados-mediante-bombardeo-ionico-y-nanoindentacion\/"},"modified":"2018-03-09T09:04:48","modified_gmt":"2018-03-09T09:04:48","slug":"defectos-superficiales-en-au001-generados-mediante-bombardeo-ionico-y-nanoindentacion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/defectos-superficiales-en-au001-generados-mediante-bombardeo-ionico-y-nanoindentacion\/","title":{"rendered":"Defectos superficiales en au(001) generados mediante bombardeo i\u00f3nico y nanoindentaci\u00f3n"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Oscar Rodr\u00edguez De La Fuente <\/strong><\/h2>\n<p>Hemos estudiado los defectos superficiales en au(001) 5&#215;20 generados mediante dos diferentes t\u00e9cnicas experimentales: bombardeo i\u00f3nico de baja energ\u00eda y nanoindentaci\u00f3n. Hemos analizado estos defectos con microscop\u00eda de efecto t\u00fanel (stm).  los experimentos de bombardeo de iones ar+ con energ\u00eda e=600 ev revelan que los defectos producidos a muy bajas dosis son dipolos de dislocaci\u00f3n bidimensionales. Se forman mediante la difusi\u00f3n anis\u00f3tropa y agregaci\u00f3n de las vacantes generadas por cada uno de los impactos i\u00f3nicos. A dosis media observamos transformaciones estructurales en la reconstrucci\u00f3n, que puede rotar o desaparecer. Finalmente, a altas dosis, observamos una superficie nanoestructurada, con cr\u00e1teres formando un red que puede llegar a tener un cierto orden a corto alcance.  respecto a los defectos producidos por nanoindentaci\u00f3n identificamos los mecanismos incipentes de deformaci\u00f3n pl\u00e1stica en una superficie fcc (001). Por un lado, se emiten dislocaciones helicoidales que mediante deslizamiento dan lugar a terrazas alrededor del punto de indentaci\u00f3n. Por otro lado, observados y caracterizamos la emisi\u00f3n, hasta distancias del orden de cientos de angstroms, de semilazos de dislocaci\u00f3n disociados emergentes, que son fruto del desplazamiento pl\u00e1stico expulsado a lo largo de un sistema de deslizamiento principal del cristal.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Defectos superficiales en au(001) generados mediante bombardeo i\u00f3nico y nanoindentaci\u00f3n<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Defectos superficiales en au(001) generados mediante bombardeo i\u00f3nico y nanoindentaci\u00f3n <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Oscar Rodr\u00edguez De La Fuente <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/05\/2002<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Juan  Manuel Rojo  Alaminos<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Francisco javier Piqueras de noriega <\/li>\n<li>fausto Sanz carrasco (vocal)<\/li>\n<li>arturo Baro vidal (vocal)<\/li>\n<li>rodolfo Miranda soriano (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Oscar Rodr\u00edguez De La Fuente Hemos estudiado los defectos superficiales en au(001) 5&#215;20 generados mediante dos diferentes [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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