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El recocido eficiente del daño por radiación cerca de los límites de los granos a través de la emisión intersticial
Xian-Ming Bai1, Arthur F Voter, Richard G Hoagland
1Materials Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Science (New York, N.Y.)
|March 27, 2010
Resumen
Los límites de grano en el cobre exhiben un efecto de "carga-descarga", emitiendo intersticiales para aniquilar las vacantes inducidas por la radiación. Este mecanismo de autocuración repara de manera eficiente los daños materiales.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Daños por radiación Daños por radiación
- Materiales computacionales Ciencia de la ciencia.
Sus antecedentes:
- Los límites de grano son sumideros conocidos para defectos inducidos por la radiación.
- Los mecanismos atomísticos precisos de las interacciones de la frontera de grano de defecto siguen sin estar claros.
Objetivo del estudio:
- Para investigar las interacciones del límite de grano de defecto en el cobre utilizando simulaciones atomísticas.
- Para dilucidar los mecanismos detrás del límite de grano mejoró la tolerancia a la radiación.
Principales métodos:
- Se utilizaron tres métodos distintos de simulación atómica.
- Interacciones simuladas en escalas de tiempo de picosegundos a microsegundos.
- Centrado en el cobre como el material modelo.
Principales resultados:
- Descubrió una a.
Conclusiones:
- Los límites de grano actúan como fuentes dinámicas de intersticiales, facilitando la recombinación de defectos.
- Este mecanismo ofrece una vía de energía más baja para el daño de la radiación de auto-curación.
- Los hallazgos revelan una nueva vía para mejorar la resistencia de los materiales a la radiación.
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