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Compuesto de diamantes de estructura jerárquica con una dureza excepcional

Yonghai Yue1,2, Yufei Gao1, Wentao Hu1

  • 1Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China.

Nature
|June 20, 2020
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo compuesto de diamante con arquitectura jerárquica, logrando cinco veces la dureza del diamante sintético sin comprometer la dureza. Este avance podría conducir a materiales súper duros superiores y cerámica de ingeniería.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • La cristalografía

Sus antecedentes:

  • La compensación entre dureza y dureza es un desafío importante en la ciencia de los materiales, especialmente para el diamante.
  • La nanoestructuración, incluido el nanotwinning, puede mejorar la dureza y la resistencia del diamante.
  • La investigación limitada ha explorado estrategias avanzadas de endurecimiento, como compuestos de inspiración biológica, en el diamante.

Objetivo del estudio:

  • Para caracterizar un nuevo compuesto de diamantes con una estructura jerárquica.
  • Para evaluar las propiedades mecánicas del compuesto, específicamente dureza y tenacidad.
  • Para entender los mecanismos de fractura en el compuesto de diamante avanzado.

Principales métodos:

  • Caracterización estructural de un compuesto de diamantes ensamblado jerárquicamente.
  • Síntesis de politipos de diamantes con estructuras de interfaz coherentes, nanotwines y nanogranos.
  • Pruebas mecánicas mediante ensayos de rayos dentados de un solo filo para determinar la dureza de la fractura.

Principales resultados:

  • El compuesto de diamante exhibe una mayor dureza (hasta cinco veces la del diamante sintético) sin sacrificar la dureza.
  • La propagación de grietas sigue una trayectoria en zigzag a través de nanotwines de diamante 3C, difundiéndose en fracturas sinuosas en interfaces de politipo no 3C.
  • La transformación local en diamante 3C cerca de las superficies de fractura y las trayectorias de grietas en zigzag disipan la energía de deformación, aumentando la dureza.

Conclusiones:

  • La arquitectura jerárquica en los compuestos de diamantes puede superar la compensación de dureza y dureza.
  • Este enfoque ofrece una vía para desarrollar materiales súper duros avanzados y cerámicas de ingeniería.
  • El compuesto desarrollado demuestra una dureza superior, superior a la de algunas aleaciones de magnesio.