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Crecimiento anormal de los granos inducido por el tratamiento térmico cíclico
Toshihiro Omori1, Tomoe Kusama, Shingo Kawata
1Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba-yama, Sendai 980-8579, Japan. omori@material.tohoku.ac.jp
Science (New York, N.Y.)
|September 28, 2013
Resumen
Los investigadores desarrollaron un método de tratamiento térmico cíclico para hacer crecer grandes cristales individuales en aleaciones de memoria de forma a base de cobre. Este crecimiento anormal de granos supera las limitaciones de los métodos convencionales, permitiendo la fabricación de cristales a escala centímetrica.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La metalurgia es la metalurgia.
- La cristalografía es una técnica de cristalografía.
Sus antecedentes:
- El crecimiento de granos en materiales policristalinos tiene como objetivo reducir los límites de granos de alta energía.
- El recocido convencional suele ralentizar el crecimiento de los granos con el tiempo, lo que dificulta la formación de granos grandes.
Objetivo del estudio:
- Desarrollar un método novedoso para fabricar cristales únicos a escala centímetrica en aleaciones de memoria de forma a base de cobre.
- Para investigar el fenómeno del crecimiento anormal de granos en estos materiales.
Principales métodos:
- Utilizó un proceso de tratamiento térmico cíclico.
- Se introdujo una estructura de subgrano a través de la transformación de fase.
Principales resultados:
- Obtuvo con éxito cristales individuales que superan varios centímetros de tamaño.
- Se observó un crecimiento anormal de los granos impulsado por la estructura subgranular inducida.
Conclusiones:
- El tratamiento térmico cíclico permite la fabricación de grandes cristales únicos en aleaciones de memoria de forma.
- La formación de la estructura del subgrano durante la transformación de fase es clave para el crecimiento anormal del grano.
- Este método es crucial para mejorar la memoria de forma, las propiedades magnéticas y de arrastre.
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