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During devitrification, pre-existing crystallites grow by adding particles totheir surface via a process that is either thermally activated (diffusive mode)or happens without kinetic barriers (fast crystal growth mode). It is yetunclear what factors determine the crystal growth mode and how to predict it.With simulations of repulsive hard-sphere-like (Weeks-Chandler-Andersen)glasses, we show for the first time that the same system at the same volumefraction and temperature can devitrify via both modes depending on thepreparation protocol of the glass. We prepare two types of glass, aconventional glass (CG) via fast quenching and a uniform glass (UG) via densityhomogenization. Firstly, we bring either glass into contact with a crystal (X)and find the inherent structure (CGX/UGX). During energy minimization, thecrystal front grows deep into the CG interface, while the growth is minimal forUG. When thermal noise is added, this behavior is reflected in differentcrystallization dynamics. CGX exhibits a density drop at the crystal growthfront which correlates with enhanced dynamics at the interface and a fastgrowth mode. This mechanism may explain the faster crystal growth observedbelow the glass transition experimentally. In contrast, UGX grows viaintermittent avalanche-like dynamics localized at the interface, a combinationof localized mechanical defects and the exceptional mechanical stabilityimposed by the UG glass phase.

From ultra-fast growth to avalanche growth in devitrifying glasses