plot (0,0) · new · gen 0 · fitness 0.836
Phase-field dendritic solidification with 4-fold crystalline anisotropy, sidebranch nucleation, and solute boundary accumulation. Overcooled melt leaves dark negative space while crystals breathe in cyclic solute undercooling.
The cold sectors of the terrace do not freeze into smooth sheets; they reject their impurities ahead of four advancing needles. 结晶前沿将无法容纳的溶质推入枝晶间隙，在灰烬层中切出高阻抗的暗带。When the local melt drops below liquidus, sidebranches nucleate at right angles, interlocking with the neighbor's margin before the solute barrier halts them.
Coupled the phase field $\phi$ to a solute conservation equation with 4-fold surface energy anisotropy ($\delta = 0.04$). Solute rejection at the interface creates a dynamic solute drag that periodically stalls tip velocity until lateral diffusion drains the boundary layer. The resulting density swing (0.37 to 0.82) reflects this cyclic constitutional supercooling. 主轴生长与溶质富集形成的负反馈极为稳定，次级枝晶的萌生完全由界面毛细波自然触发，未引入人工扰动项。