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Vidrios metálicos a granel de alta temperatura desarrollados por métodos combinatorios

Ming-Xing Li1,2, Shao-Fan Zhao3, Zhen Lu4

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing, China.

Nature
|May 3, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nuevos vidrios metálicos de iridio/níquel/tantal con altas temperaturas de transición de vidrio y una amplia región líquida súper enfriada. Estos vidrios metálicos avanzados ofrecen una resistencia y formabilidad superiores a altas temperaturas para aplicaciones exigentes.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Trabajos de metalurgia
  • Física del estado sólido

Sus antecedentes:

  • Los vidrios metálicos ofrecen propiedades mecánicas superiores en comparación con las aleaciones convencionales.
  • Las altas temperaturas de transición de vidrio son deseables para aplicaciones de alta temperatura.
  • La limitada formabilidad termoplástica en los vidrios metálicos de alta temperatura existentes restringe el uso práctico.

Objetivo del estudio:

  • Diseñar y descubrir nuevos vidrios metálicos a granel con propiedades mejoradas a alta temperatura.
  • Para superar las limitaciones de las regiones líquidas superenfriadas estrechas en los vidrios metálicos existentes.
  • Desarrollar un enfoque práctico para la identificación de nuevas composiciones metálicas de vidrio con características deseables.

Principales métodos:

  • Diseño de vidrios metálicos a base de iridio/níquel/tantal (Ir-Ni-Ta), incluidas las variantes de boro.
  • Utilizó un enfoque combinatorio simplificado que correlaciona la capacidad de formación de vidrio con la resistividad eléctrica.
  • Temperatura de transición de vidrio caracterizada, región líquida súper enfriada, resistencia mecánica y capacidad de formación de vidrio (espesor crítico de fundición).

Principales resultados:

  • Se han desarrollado vidrios metálicos Ir-Ni-Ta-B con una temperatura de transición de vidrio de hasta 1.162 K y una región líquida sobreenfriada de 136 K.
  • Alcanzó una alta resistencia de 3,7 GPa a 1,000 K, superando las aleaciones existentes.
  • Demostró un espesor de fundición crítico de 3 mm, lo que permite la formación termoplástica de componentes a pequeña escala.

Conclusiones:

  • Los vidrios metálicos de nuevo diseño exhiben una resistencia excepcional a altas temperaturas y una mejora de la formabilidad termoplástica.
  • El enfoque combinatorio que utiliza la resistividad eléctrica es un método eficaz y no destructivo para descubrir nuevos vidrios metálicos.
  • Esta investigación allana el camino para el desarrollo de vidrios metálicos avanzados para aplicaciones a altas temperaturas y en entornos hostiles.