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Refuerzo adicional y endurecimiento por trabajo en metales nanotwinados de gradiente
Zhao Cheng1,2, Haofei Zhou3, Qiuhong Lu1
1Shengyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
Science (New York, N.Y.)
|November 3, 2018
Resumen
Las estructuras de gradiente en cobre exhiben una mayor resistencia y endurecimiento debido a patrones de dislocación únicos. Este diseño de gradiente ofrece una ruta prometedora para mejorar las propiedades mecánicas del material.
Área de la Ciencia:
- Ciencias de los materiales
- Ingeniería mecánica
- Nanotecnología
Sus antecedentes:
- Las estructuras gradientes son comunes en la naturaleza y cada vez más utilizadas en materiales de ingeniería.
- Comprender el comportamiento mecánico de las estructuras de gradiente sigue siendo un desafío.
Objetivo del estudio:
- Para investigar el rendimiento mecánico de una estructura nanotwined gradiente en cobre puro.
- Explorar la relación entre los gradientes estructurales y las propiedades mecánicas.
Principales métodos:
- Fabricación de una estructura de gradiente de nanotwin en cobre puro.
- Pruebas experimentales sistemáticas.
- Simulaciones atómicas.
Principales resultados:
- Un gran gradiente estructural resultó en un mejor endurecimiento y resistencia del trabajo.
- Las propiedades mecánicas superaron a las del material constitutivo más resistente.
- Se observó un patrón único de densidades de dislocación ultra altas en el interior de los granos.
Conclusiones:
- El diseño de gradientes puede mejorar significativamente las propiedades mecánicas del material.
- Los hallazgos proporcionan información sobre el comportamiento de las estructuras de gradiente.
- Este enfoque ofrece una estrategia prometedora para el desarrollo de materiales avanzados.
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