{"id":57495,"date":"2018-03-09T22:45:16","date_gmt":"2018-03-09T22:45:16","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/mecanismos-de-nanocristalizacion-en-precursores-amorfos-propiedades-estructurales-y-magneticas\/"},"modified":"2018-03-09T22:45:16","modified_gmt":"2018-03-09T22:45:16","slug":"mecanismos-de-nanocristalizacion-en-precursores-amorfos-propiedades-estructurales-y-magneticas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/mecanismos-de-nanocristalizacion-en-precursores-amorfos-propiedades-estructurales-y-magneticas\/","title":{"rendered":"Mecanismos de nanocristalizaci\u00f3n en precursores amorfos propiedades estructurales y magn\u00e9ticas"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Miguel L\u00f3pez Hern\u00e1ndez <\/strong><\/h2>\n<p>Esta tesis doctoral tiene como n\u00facleo el estudio de las aleaciones nanocristalinas ricas en hierro magn\u00e9ticamente blandas. En ella se analiza la influencia del tama\u00f1o de part\u00edcula en las propiedades magn\u00e9ticas y estructurales del sistema fesibnbcu nanocristalino al someterlo a molienda mec\u00e1nica de alta energ\u00eda. Dichos estudios muestran un notable endurecimiento magn\u00e9tico, donde el aumento del campo coercitivo, hc es atribuido no solo a la introducci\u00f3n de defectos estructurales y una alta densidad de dislocaciones. Si los valores de deformaci\u00f3n son elevados el comportamiento de hc, viene dominado por la anisotrop\u00eda magnetoel\u00e1stica generada por las deformaciones. Sin embargo, cuando el material molido es sometido a tratamientos t\u00e9rmicos de relajaci\u00f3n estructural para descartar la influencia de las tensiones introducida durante la reducci\u00f3n del material, los resultados indican una notable aumento del campo coercitivo con la reducci\u00f3n del tama\u00f1o de  part\u00edculas. Tambi\u00e9n se presenta la molienda mec\u00e1nica de alta energ\u00eda como una alternativa a la nanocristalizaci\u00f3n por tratamientos t\u00e9rmicos. Se analiza la influencia de la molienda en el proceso de nanocristalizaci\u00f3n de un precursor amorfo de composici\u00f3n fe73.5si16.5b6nb3cu1, estableciendo diferencias con respecto a la nanocristalizaci\u00f3n t\u00e9rmica convencional de cintas amorfas. Los estudios estructurales evidencian la existencia de part\u00edculas con estructura nanocristalina y tama\u00f1os de part\u00edculas nanom\u00e9tricos. La evoluci\u00f3n del campo coercitivo muestra en las muestras nanocristalizadas mec\u00e1nicamente un aumento de varios \u00f3rdenes de magnitud respecto de las cintas nanocristalinas dela misma composici\u00f3n.     del mismo modo se analiza la influencia en las propiedades estructurales y magn\u00e9ticas al sustituir parcialmente, en el sistema fe-si-b-nb-cu, el fe por co o cr. La sustituci\u00f3n de co por fe permite analizar nuevos aspectos de la interacci\u00f3n de canje en sistemas nanocristalinos con mayor<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Mecanismos de nanocristalizaci\u00f3n en precursores amorfos propiedades estructurales y magn\u00e9ticas<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Mecanismos de nanocristalizaci\u00f3n en precursores amorfos propiedades estructurales y magn\u00e9ticas <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Miguel L\u00f3pez Hern\u00e1ndez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 14\/03\/2007<\/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>Pilar Marin Palacios<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Vicent l\u00f3pez Jos\u00e9 Luis <\/li>\n<li>Mar\u00eda Gonz\u00e1lez Jes\u00fas (vocal)<\/li>\n<li>Manuel V\u00e1zquez villalabeitia (vocal)<\/li>\n<li>asunci\u00f3n Garcia escorial (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Miguel L\u00f3pez Hern\u00e1ndez Esta tesis doctoral tiene como n\u00facleo el estudio de las aleaciones nanocristalinas ricas en [&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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