Numerical Simulation of Non-isothermal Dendritic Growth of Binary Alloy Using Phase-field Method

The dendritic growth process during nonisothermal and isothermal solidifications in a Al45%Cu binary alloy was simulated using the phasefield model.Solute diffusion equation and heat transfer equation were solved simultaneously.The effect of noise on the dendritic growth, solute and temperature profile in undercooled liquid alloy were investigated.The results indicate that the noise could trigger the growth of the secondary arms, and increase the highest temperature in solid;but not influence the tip operating state. The solute and temperature gradients in the tip are the highest. Increased melt tempeture reduces sources of instability, which leads to less developed structure of the nonisothermal dendritic, and reduces the value of the composition at the interface.