Many-body potential for point defect clusters in Fe-C alloys
TT Lau and CJ Foerst and X Lin and JD Gale and S Yip and KJ Van Vliet, PHYSICAL REVIEW LETTERS, 98, 215501 (2007).
Modeling the consequences of crystalline defects requires efficient interaction sampling. Empirical potentials can identify relevant pathways if the energetics and configurations of competing defects are captured. Here, we develop such a potential for an alloy of arbitrary point defect concentration, body-centered cubic alpha-Fe supersaturated in C. This potential successfully calculates energetically favored defects, and predicts formation energies and configurations of multicarbon-multivacancy clusters that were not attainable with existing potentials or identified previously via ab initio methods.
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