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纯Ni枝晶生长过程的相场法数值模拟
Simulation of Dendritic Crystal Growth of Pure Ni Using the Phasefield Model
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- DOI:
- 作者:
- 赵宇宏1,2,周力1,2,王明光1,2,牛晓峰2,3赵宇辉1,2,侯华1,2,任巨良2,4
- 作者单位:
- .中北大学材料科学与工程学院,山西 太原 030051;2.中北大学液态成形技术研究中心,山西 太原030051;3.太原理工大学材料与工程学院,山西 太原 030024;4.山西泫氏铸业有限公司,山西 高平 048400
- 关键词:
- 相场法;枝晶生长;数值模拟;过冷熔体
Phasefield model; Dendrite growth; Numerical simulation; Supercooled melt
- 摘要:
- 采用凝固过程相场模型,对纯Ni过冷熔体中的枝晶生长过程进行了计算模拟,研究了各向异
性强度、过冷度、扰动等对枝晶生长的影响.结果表明:随着各向异性强度的增大,枝晶尖
端生长速度加快,枝晶结构特征愈加明显;随着过冷度的增加,枝晶尖端稳定性遭到破坏,
甚至出现分叉;扰动会促发侧向分枝的形成,但不影响枝晶尖端的稳态生长行为。
The phasefield model is used in the numerical simulation of dendritic crystal
growth in supercooled melt of pure Ni. The factors of anisotropy, degree of supe
rcooling and thermal noise is investigated in this paper. The simulated
result shows that as the degree of anisotropy increases, the growth velocity of
dendrite tip is accelerated and characteristic of dendritic structure is more ob
vious; As the degree of supercooling increases, stability of dendrite tip will b
e damaged, the dendrite tip branchingoff will happen. Stirring power can promo
te sidebranching, but does not affect growth state of dendritic crystal.