Figure 7
(a) Critical velocity for the transition to dendrite versus the anisotropy strength at a fixed thermal gradient (G = 0.7 K/μm) and the morphological boundaries in the plane of (ε4, Vp), where the red dashed line represents the boundary between the degenerate seaweed and the tilted dendrite, and the green one represents the boundary between the unstable cells and other growth patterns; (b) typical unstable cells at (0.02, 175 μm/s); (c) typical tilted dendritic arrays at (0.02, 200 μm/s).
