Phase Field Simulation of Effect of Super-Cooling Degree on Nickel Dendrite Growth

Abstract

The phase field coupling with the temperature distribution field is a good method to simulate the dendrite growth during isothermal solidification. The effects of super-cooling degree on the dendrite growth are studied in the process of Nickel isothermal solidification. The results indicate that super-cooling degree has an important effect on the dendrite growth. When the super-cooling degree is small, the rate of crystal growth all is small and the shape of Crystal nucleus is an approximative ball. As super-cooling degree increases, the rate of crystal growth become large fast and the main branch Grow up quickly and its shap become long and thin, and secondary branch appear in the root between every two main branch. Ever, as the super-cooling degree become very large, the more arm dendrite appear and the rate of the main branch is smothered.