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Examen de Materiales Eléctricos y Magnéticos
Teoría
Defectos puntuales en la cristalización
esquema del grano solidificado en moldes metálicos frío, metálico caliente y arena
Difusión
Fatiga y Diagrama de Fischler
Variedades alotrópicas del Fe y sistemas de cristalización
Diagrama TTT y constituyentes con sus temperaturas respectivas
Reacción peritéctica
Curva de solidificación con sobrefusión
Velocidad de nucleación y crecimiento en el tamaño del grano
Cristales Iónicos y covalentes. Diferencias
En el sistema hexagonal compacto qué regula la ductilidad o fragilidad. Demostrarlo
Normalización de las aleaciones de Fe
Problemas
Representar gráficamente [4 0 3 ]
Dados [1 1 0] y [1 1 1 ] del Cu que cristaliza en el CCC de Ra=1,3 Å y Ma=63,6 gr/mol. Calcular la densidad teórica del Cu y la densidad atómica superficial de los planos indicados.
Una forma del Mn tiene Ra =1,2 Å y a0=9 Å y su F.E. = 0,48. Calcular el nº de átomos en una celda.
Calcular la cantidad de ferrita y austenita y de ferrita y cementita que tiene a la temperatura eutectoide un acero 0,5% de C.
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Enviado por: Taz Idioma: castellanoPaís: España