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Aleaciones de alta temperatura basadas en cobalto
1Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.
Science (New York, N.Y.)
|April 8, 2006
Resumen
Las nuevas superaleaciones basadas en cobalto exhiben una resistencia superior a altas temperaturas. Estas aleaciones avanzadas están reforzadas por un compuesto de estructura L1 ((2) único, que ofrece un potencial prometedor para los materiales de próxima generación.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La metalurgia es la metalurgia.
- Aleaciones para altas temperaturas.
Sus antecedentes:
- Las superaleaciones convencionales a base de níquel se enfrentan a limitaciones en aplicaciones extremas de altas temperaturas.
- La necesidad de materiales avanzados con mayor resistencia a altas temperaturas es fundamental para las tecnologías de próxima generación.
Objetivo del estudio:
- Identificar y caracterizar nuevas superaleaciones basadas en cobalto con propiedades mecánicas superiores a altas temperaturas.
- Investigar los mecanismos de fortalecimiento en estos nuevos sistemas de aleación.
Principales métodos:
- Análisis metalúrgico y caracterización de aleaciones basadas en cobalto.
- Identificación de las fases de fortalecimiento con la estructura L1(2).
Principales resultados:
- Se identificaron superaleaciones a base de cobalto que demuestran una mayor resistencia a altas temperaturas que las superaleaciones convencionales a base de níquel.
- Se encontró que un compuesto ternario, gamma' Co3 ((Al,W), con la estructura L1 ((2) se precipita de manera coherente en la matriz de cobalto, proporcionando un fortalecimiento a alta temperatura.
- También se identificó un compuesto ternario similar, gamma' Ir3(Al,W).
Conclusiones:
- Las superaleaciones basadas en cobalto reforzadas por gamma' Co3 ((Al,W) ofrecen ventajas significativas para aplicaciones a altas temperaturas.
- Los sistemas de base Co-Ir-Al-W con estructuras gamma+gamma' muestran una gran promesa como materiales de alta temperatura de próxima generación.
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