Quantum mechanics

Materials science

Orientation (vector space)

Misorientation

Succinonitrile

Temperature gradient

Grain boundary

Thermodynamics

Physics

Alloy

Mathematics

Optics

Thermal

Microstructure

Condensed matter physics

Directional solidification

Geometry

Composite material

Crystallography

Chemistry

Electrode

Symmetry (geometry)

Mechanics

Electrolyte

Physical Review E

In directional solidification, as the solidification velocity increases, the growth direction of cells or dendrites rotates from the direction of the thermal gradient to that of a preferred cristalline orientation. Meanwhile, their morphology varies with important implications for microsegregation. Here, we experimentally document the growth directions of these microstructures in a succinonitrile alloy in the whole accessible range of directions, velocities, and spacings. For this, we use a thin sample made of a single crystal on which the direction of the thermal gradient can be changed. This allows a fine monitoring of the misorientation angle between thermal gradient and preferred crystalline orientation. Data analysis shows evidence of an internal symmetry which traces back to a scale invariance of growth directions with respect to a P\'eclet number. This enables the identification of the relationship between growth directions and relevant variables, in fair agreement with experiment. Noticeable variations of growth directions with misorientation angles are evidenced and linked to a single parameter.

Growth directions of microstructures in directional solidification of crystalline materials