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Solid-solid phase boundary anisotropy is a key factor controlling theselection and evolution of non-faceted eutectic patterns during directionalsolidification. This is most remarkably observed during the so-calledmaze-to-lamellar transition. By using serial sectioning, we followed thespatio-temporal evolution of a maze pattern over long times in a large Al-Al2Cueutectic grain with known crystal orientation of the Al and Al2Cu phases, henceknown crystal orientation relationship (OR). The corresponding phase boundaryenergy anisotropy ($\gamma$-plot) was also known, as being previously estimatedfrom molecular-dynamics computations. The experimental observations reveal thetime-scale of the maze-to-lamellar transition and shed light on the processesinvolved in the gradual alignment of the phase boundaries to one distinctenergy minimum which nearly corresponds to one distinct plane from the family$\{120\}^{\rm{Al}} //\{110\}^{\rm{Al2Cu}}$. This particular plane is selecteddue to a crystallographic bias induced by a small disorientation of thecrystals relative to the perfect OR. The symmetry of the OR is thus slightlybroken, which promotes lamellar alignment. Finally, the maze-to-lamellartransition leaves behind a network of fault lines inherited from the phaseboundary alignment process. In the maze pattern, the fault lines align alongthe corners of the Wulff shape, thus allowing us to propose a link between thepattern defects and missing orientations in the Wulff shape

Phase boundary anisotropy and its effects on the maze-to-lamellar transition in a directionally solidified Al-Al2Cu eutectic