{"id":86893,"date":"2000-11-10T00:00:00","date_gmt":"2000-11-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/propiedades-magneticas-y-magnetoelasticas-de-aleaciones-amorfas-y-nanocristalinas-ricas-en-hierro\/"},"modified":"2000-11-10T00:00:00","modified_gmt":"2000-11-10T00:00:00","slug":"propiedades-magneticas-y-magnetoelasticas-de-aleaciones-amorfas-y-nanocristalinas-ricas-en-hierro","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/propiedades-magneticas-y-magnetoelasticas-de-aleaciones-amorfas-y-nanocristalinas-ricas-en-hierro\/","title":{"rendered":"Propiedades magneticas y magnetoelasticas de aleaciones amorfas y nanocristalinas ricas en hierro."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Juan  Manuel Arcas Guijarro <\/strong><\/h2>\n<p>En esta tesis se analizan las propeidades magn\u00e9ticas y magnetoel\u00e1sticas de aleaciones amorfas y nanocristlinas de composici\u00f3n fesibnbcu y fezr(bcu) y se relacionan con su estructura. Dichas aleaciones han sido fabricadas en estado amorfo mediante la t\u00e9cnica de enfriamiento ultrarr\u00e1pido y posteriormente se han tratado t\u00e9rmicamente con el fin de obtener una fase nanocristalina.  las aleaciones de composici\u00f3n fe73,5siyb22,5nb3cu1 (y=13,13,5,14,15,15,5) han sido tratadas durante una hora a 813 k, obteni\u00e9ndose la fase do3-fesi en forma nanocristalina, cuyo contenido en si depende de la composici\u00f3n de la aleaci\u00f3n de partida.  en estas aleaciones la constante de magnetostricci\u00f3n disminuye dr\u00e1sticamente en el proceso de nanocristalizaci\u00f3n ya que es el promedio en volumen de las constantes de la fase amorfa, de signo  positivo, y cristalina, se signo negativo. Al aumentar el contenido en si de la fase cristalina, su constante de magentostrici\u00f3n se hace m\u00e1s negativa y la constante de magnetostricci\u00f3n total disminuye, mejorando las caracter\u00edsticas magn\u00e9ticas blandas.  asimismo, se encuentra que en las aleaciones de menor constante de magnetostricci\u00f3n el signo la deformaci\u00f3n inducida por el campo var\u00eda al modificar el estado inicial de la imanaci\u00f3n, estas variaciones se han atribuido a la existencia de dominos con diferente signo de la constante de magnetostricci\u00f3n.  las aleaciones de composici\u00f3n fe87,2zr7,4b4,3cu1,1 y fe85zr7b6cu2 han sido tratadas a temperaturas entre 520 k y 1000k, obteni\u00e9ndose una fase nanocristalina de bcc fe cuyo tama\u00f1o de grano y volumen relativo crecen con la temperatura de tratamiento. Se ha caracterizado la evoluci\u00f3n t\u00e9rmica del campo coercitivo en todas las muestras.  en las muestras de ambas composiciones tratadas al principio del proceso de nanocristalizaci\u00f3n se observa un endurecimiento magn\u00e9tico a temperatura ambiente que se corresponde con una variaci\u00f3n en la estructura de dominios<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Propiedades magneticas y magnetoelasticas de aleaciones amorfas y nanocristalinas ricas en hierro.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Propiedades magneticas y magnetoelasticas de aleaciones amorfas y nanocristalinas ricas en hierro. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Juan  Manuel Arcas Guijarro <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 11\/10\/2000<\/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>Antonio Hernando Grande<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan  manuel Rojo  alaminos <\/li>\n<li>Manuel V\u00e1zquez villalabeitia (vocal)<\/li>\n<li> Barandiaran garcia Jos\u00e9 Manuel (vocal)<\/li>\n<li>Jes\u00fas Mar\u00eda Gonzalez  fernandez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Juan Manuel Arcas Guijarro En esta tesis se analizan las propeidades magn\u00e9ticas y magnetoel\u00e1sticas de aleaciones amorfas [&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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