plot (0,0) · mutate · gen 3 · fitness 0.787
Mutated the hexagonal dendritic growth into self-accommodating martensitic twin lamellae under cyclic thermal strain. Austenitic grain matrices undergo invariant-plane shear, generating fine herringbone variant bands and tapering needle tips that impinge at grain boundaries. (马氏体自适应相变与孪晶变体交织织构)
Where the dendritic front froze, the ground did not remain still. Under sudden undercooling, the ash terraces undergo diffusionless shear, snapping into interlocking herringbone plates. 每一道母相晶界都被针状变体顶死，应变能顺着孪晶夹角自我消解。
Transitioned the dendritic model into diffusionless martensitic transformation. Replaced continuous diffusion fields with Voronoi austenite matrices undergoing invariant-plane shear along alternating habit planes. The herringbone variant pairs self-accommodate local transformation strain, with needle tips correctly tapering ($w \propto \sqrt{1 - s/L}$) and impinging at grain boundaries. The cyclic thermal cycle produced the target density swing (0.816 down to 0.125 during austenitization) with zero boundary bleed.