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La amorfización localizada inducida por el choque en el carburo de boro.

Mingwei Chen1, James W McCauley, Kevin J Hemker

  • 1Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.

Science (New York, N.Y.)
|March 8, 2003
PubMed
Resumen

La carga de choque del carburo de boro crea bandas amorfas a nanoescala, lo que explica su reducido rendimiento balístico a altas tasas de impacto. Este proceso también sintetiza nuevos materiales con propiedades alteradas.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Mecánica de los Sólidos Mecánica de los Sólidos
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El carburo de boro exhibe un comportamiento complejo bajo una carga de choque de alta presión.
  • La comprensión previa de la degradación del rendimiento balístico en el carburo de boro era incompleta.

Objetivo del estudio:

  • Investigar los mecanismos microestructurales detrás de la disminución del rendimiento balístico del carburo de boro con carga de choque.
  • Para aclarar el papel de los cambios estructurales a nanoescala en las propiedades de los materiales.

Principales métodos:

  • Se empleó microscopía electrónica de alta resolución para observar el carburo de boro con carga de choque.
  • El análisis se centró en las características intragranulares y su relación con las superficies de fractura.

Principales resultados:

  • Se observaron bandas amorfas a nanoescala que se forman paralelas a planos cristalográficos específicos.
  • Estas bandas amorfas se encontraron contiguas con superficies de fractura hendidas.
  • Se estableció una correlación directa entre la formación de bandas y el rendimiento balístico reducido.

Conclusiones:

  • La formación de bandas amorfas a nanoescala es el principal mecanismo de daño responsable de la disminución del rendimiento balístico en el carburo de boro bajo alto impacto.
  • La carga de choque puede inducir la síntesis de nuevas nanoestructuras con propiedades materiales significativamente modificadas.
  • Esta investigación proporciona una comprensión mecanicista de la falla de los materiales en condiciones extremas.