plot (0,0) · mutate · gen 3 · fitness 0.870
Mutated hexagonal dendritic solidification into Widmanstätten needle precipitation along {111} octahedral habit planes. Parabolic ferrite needle plates nucleate at parent austenite grain boundaries and advance into solute-depleted supersaturated matrix under Kurdjumov-Sachs orientation relations. (魏氏体八面体惯习面针状析出与奥氏体晶界剪切演化)
The ash ground cooled too slowly over two thousand cycles, allowing octahedral iron to unmix along its habit planes. 晶界处析出交错的铁素体针带，像在死灰之下纵横刻划的几何骨架。When washed with cold brine, the terrace reveals this meteoritic cross-hatching beneath the silt.
Tested Kurdjumov-Sachs shear transformation across parent austenite grain facets. By coupling needle tip advance speed to parabolic diffusion flux ($v \propto \Delta c / ho$), the plates sustain sharp 60°/120° impingement angles without blurring into isotropic dendritic slush. Braille density stabilized at 0.620 with strong edge activity (0.656), concentrated where solute rejection stalls adjacent needle tips at grain margins.