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A phase field crystal model is used to investigate the mechanisms offormation and growth of early clusters in quenched/aged dilute binary alloys, aphenomenon typically outside the scope of molecular dynamics time scales. Weshow that formation of early sub-critical clusters is triggered by the stressrelaxation effect of quenched-in defects, such as dislocations, on the energybarrier and the critical size for nucleation. In particular, through analysisof system energetics, we demonstrate that the growth of sub-critical clustersinto overcritical sizes occurs due to the fact that highly strained areas inthe lattice locally reduce or even eliminate the free energy barrier for afirst-order transition.

Phase field crystal modeling of early stage precipitation and clustering