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We show that the interaction of a particle with a directionally solidifiedinterface induces the onset of morphological instability provided that theparticle-interface distance falls below a critical value. This instabilityoccurs at pulling velocities that are below the threshold for the onset of theMullins-Sekerka instability. The expression for the critical distance revealsthat this instability is manifested only for certain combinations of thephysical and processing parameters. Its occurence is attributed to the reversalof the thermal gradient in the melt ahead of the interface and behind theparticle.Comment: 5 pages, 4 figures. To appear in Eur. Phys. J.

Morphological instability induced by the interaction of a particle with a solid-liquid interface