【摘要】 利用相场法微观组织数值模拟技术,对纯铝物质的枝晶生长过程进行了仿真。研究了初始晶核半径、空间步长和各向异性对纯铝枝晶生长的影响。通过计算结果表明,在保证初始晶核半径不被熔化前提下,初始晶核半径不影响枝晶形貌;空间步长取值应在0.2d0~0.6d0 范围内;各向异性趋于增大枝晶尖端生长速度,减小枝晶尖端半径。更多还原

【Abstract】 The dendrite growth in the undercooled melt of pure is simulated by the phase-field method. The dependence of aluminum dendrite growth on the initial nucleus radius, space step and anisotropy is investigated. By a series of simulation, the calculated results indicate that the value of the initial nucleus radius has not influence upon the dendrite patterns with the precondition that initial nucleus can not be melted; the space step ranges from 0.2d₀ to 0.6d₀; the anisotropy coefficient tends to increase the growth velocity of dendrite tip and reduce tip radius.更多还原