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We propose a model for the abrupt emergence, below temperatures close to theglass transition, of the ultra-fast (GC) steady mode of spherulitic crystalgrowth in deeply undercooled liquids. We interpret this phenomenon ascontrolled by the interplay between the generation of stresses bycrystallization and their partial release by flow in the surrounding amorphousvisco-elastic matrix. Our model is consistent with both the observed ratios($\sim10^4$) of fast-to-slow velocities and the fact that fast growth emergesclose to the glass transition. It leads us to conclude that the existence of afast growth regime requires both (i) a high fragility of the glassformer; (ii)the fine sub-structure specific of spherulites. It finally predicts that thetransition is hysteretic, thus allowing for an independent experimental test.

Ultrafast spherulitic crystal growth as a stress-induced phenomenon specific of fragile glass-formers