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Origen mecánico y predicción de la ductilidad mejorada en aleaciones de magnesio
Zhaoxuan Wu1,2, Rasool Ahmad1, Binglun Yin1
1Institute of Mechanical Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.
Science (New York, N.Y.)
|January 27, 2018
Resumen
El magnesio se puede hacer dúctil con adiciones específicas de soluto. Estas adiciones mejoran las tasas de deslizamiento, superando las limitaciones y permitiendo aleaciones de magnesio de alta formabilidad para aplicaciones energéticamente eficientes.
Área de la Ciencia:
- Ciencias de los materiales
- Trabajos de metalurgia
- Física del estado sólido
Sus antecedentes:
- El magnesio puro tiene poca ductilidad debido a las transformaciones de dislocación piramidal.
- Esto limita su uso en aplicaciones que requieren una alta eficiencia energética.
Objetivo del estudio:
- Para explicar cómo las adiciones de soluto diluido mejoran la ductilidad del magnesio.
- Desarrollar una teoría cuantitativa para predecir la ductilidad basada en la composición de la aleación.
Principales métodos:
- Modelado teórico de la dinámica de la dislocación.
- Validación experimental con varias aleaciones de magnesio.
- Microscopía electrónica de transmisión (TEM, por sus siglas en inglés) para el análisis microestructural.
Principales resultados:
- Las adiciones de soluto aumentan significativamente las tasas de deslizamiento y multiplicación de las dislocaciones no basales.
- Estas tasas mejoradas evitan las transformaciones perjudiciales, lo que permite la deformación plástica.
- Una teoría cuantitativa predice con precisión la ductilidad basada en la composición de la aleación.
Conclusiones:
- El deslizamiento transversal mejorado por soluto es el mecanismo clave para mejorar la ductilidad del magnesio.
- La teoría desarrollada puede guiar el diseño de aleaciones de magnesio de alta formabilidad.
- Esta investigación facilita el desarrollo de aleaciones avanzadas de magnesio para aplicaciones más amplias.
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