Crystal nucleation and cluster-growth kinetics in a model glass under shear

Abstract

Crystal nucleation and growth processes induced by an externally applied shear strain in a model metallic glass are studied by means of nonequilibrium molecular dynamics simulations, in a range of temperatures. We observe that the nucleation-growth process takes place after a transient, induction regime. The critical cluster size and the lag-time associated with this induction period are determined from a mean first-passage time analysis. The laws that describe the cluster growth process are studied as a function of temperature and strain rate. A theoretical model for crystallization kinetics that includes the time dependence for nucleation and cluster growth is developed within the framework of the Kolmogorov-Johnson-Mehl-Avrami scenario and is compared with the molecular dynamics data. Scalings for the cluster growth laws and for the crystallization kinetics are also proposed and tested. The observed nucleation rates are found to display a nonmonotonic strain rate dependency.

References in corpus (3)

• Homogeneous nucleation under shear in a two-dimensional Ising model: cluster growth, coalescence and breakup
• Shear induced crystallization of an amorphous system
• Shear Induced Structural Ordering of a Model Metallic Glass

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• Cavity nucleation in single-component homogeneous amorphous solids under negative pressure
• Growth Kinetics of the Homogeneously Nucleated Water Droplets: Simulation Results
• Liquid-Liquid Crossover in Water Model: Local Structure vs. Kinetics of Hydrogen Bonds