EFFECT OF PARAMETERS ON MICROSEGREGATION PATTERNS OF Ni-Cu BINARY ALLOY
(0) A phase-field method coupled concentration gradient for two-dimensional simulation of binary alloy solidification is studied and the effects of various material and computational parameters such as cooling rate T , solid diffusivity Ds and surface energy o on microsegregation patterns is investigated by coupling phase-field equation and diffusion equation. The results indicate that, the effect of the cooling rate on the microsegregation is obvious, with the increment of the cooling rate, the tip velocity increases accordingly, the fluctuation of solute composition in the solid becomes more acutely, and the severity of microsegregation ahead of interface aggravates. Different solid diffusivity leads to different severity of microsegregation, on increasing Ds, the fluctuant scope of solute composition in solid reduced correspondingly, and an increased level of Ds reduces the severity of microsegregation ahead of interface. The larger surface energy o is, the less acutely the solute composition in the solid fluctuates, and the degree of microsegregation alleviates.
Phase-field method numerical simulation Microsegregation
Changsheng ZHU Li FENG Zhiping WANG Rongzhen XIAO
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
国际会议
大连
英文
397-404
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）