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Textura y resistencia a la fatiga por flexión gobernadas por la deformación y la recristalización dependientes de la
Tong Wu1, Guohao Liu1, Di Liu1
1State Key Laboratory of Digital Steel, Northeastern University, Shenyang 110819, China.
Nanomaterials (Basel, Switzerland)
|January 9, 2026
Resumen
Los investigadores desarrollaron láminas de cobre de alta flexibilidad para electrónica utilizando laminación y recocido de triple capa. La optimización del tamaño de grano y la textura en capas específicas mejoró significativamente la vida útil a la fatiga por flexión, crucial para pantallas flexibles.
Área de la Ciencia:
- Ciencia de los materiales
- Ingeniería metalúrgica
- Ciencia de superficies
Sus antecedentes:
- Las láminas de cobre de alta flexibilidad son componentes esenciales para aplicaciones electrónicas avanzadas, incluidas interconexiones y pantallas flexibles.
- El rendimiento fiable de estas láminas bajo estrés cíclico es primordial para la longevidad del dispositivo.
Objetivo del estudio:
- Investigar las relaciones proceso-microestructura-propiedad en láminas de cobre ultradelgadas producidas por laminación en frío apilada de triple capa.
- Mejorar el rendimiento de fatiga por flexión de las láminas de cobre mediante recristalización controlada e ingeniería de microestructura.
Principales métodos:
- Se procesaron cintas de cobre de pureza comercial mediante laminación en frío apilada de triple capa para obtener láminas ultradelgadas.
- Se realizó un recocido posterior a 600 °C para inducir la recristalización selectiva de la orientación.
- Se evaluó la vida útil a la fatiga por flexión, correlacionando el rendimiento con la microestructura (textura y tamaño de grano) en diferentes capas.
Principales resultados:
- La laminación en frío apilada de triple capa creó distintas estructuras de deformación en las capas brillante, mate y de interfaz central.
- La capa de interfaz central exhibió la mayor vida útil a la fatiga por flexión (aproximadamente 8,0 × 10^4 ciclos) dentro de rangos específicos de textura cúbica (30-45%) y tamaño de grano (40-60 μm).
- Se encontró que el tamaño de grano controlado estabiliza el deslizamiento intergranular, reduce la desadaptación elástico-plástica y mitiga la localización de tensiones durante la flexión cíclica.
Conclusiones:
- El control dependiente de la capa de la textura y el tamaño de grano es una estrategia viable para mejorar el rendimiento de la fatiga por flexión en láminas de cobre.
- El control deliberado del tamaño de grano, incluso sin un enriquecimiento agresivo de la textura cúbica, puede mejorar significativamente la resistencia a la fatiga.
- Estos hallazgos proporcionan un vínculo claro entre proceso-microestructura-propiedad para optimizar las láminas de cobre en electrónica flexible.
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