EFFECT OF PARAMETERS ON DENDRITIC PATTERNS AND MICROSEGREGATION OF Ni-Cu BINARY ALLOY

摘要：

The effects of various material parameters such as solid diffusivity Ds, anisotropy parameter, interface kinetic coefficient β and surface energy σ on dendritic patterns and microsegregation is investigated by using a phase-field model which couples concentration gradient for two-dimensional simulation of binary alloy solidification. The computed results indicate that, different material parameters lead to different dendritic patterns and severity of microsegregation. The smaller Ds is, as well as the larger ε, β, σ are, the greater the dendritic tip velocity is, the more developed the side-branches are. The larger Ds is, the less drastically the solids solute composition undulates, and the extent of microsegregation minishes; ε affects the dendritic tips steady state, the larger εis, the more drastically the solid solute compositions undulation is, and the severity of microsegregation ahead of solid/liquid interface aggravates; the larger β is, the more acutely the solid solute compositions fluctuates, but the severity of microsegregation ahead of solid/liquid interface reduces; On increasing σ, the fluctuant extent of the solids solute composition reduces correspondingly, and an increased level of σ alleviates the severity of microsegregation ahead of solid/liquid interface.

关键词： Phase-field model Dendritic patterns Microsegregation Numerical simulation

作者: Changsheng ZHU Li FENG Zhiping WANG Rongzhen XIAO

作者单位: State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology

会议类型: 国际会议

会议名称: The Fifth International Conference on Physical and Numerical Simulation of Materials Processing(第五届材料与热加工物理模拟及数值模拟国际会议)

会议地点: 郑州

会议语种:英文

在线出版日期: 2007-10-23（万方平台首次上网日期，不代表论文的发表时间）