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We demonstrate a practical way to perform decomposition of the elasto-plasticdeformation directly from atomistic simulation snapshots. Through moleculardynamics simulations on a large single crystal, we elucidate the intricateprocess of converting plastic strain, atomic strain, and rigid rotation duringirradiation. Our study highlights how prismatic dislocation loops act asinitiators of plastic strain effects in heavily irradiated metals, resulting inexperimentally measurable alterations in lattice strain. We show the onset ofplastic strain starts to emerge at high dose, leading to the spontaneousemergence of dislocation creep and irradiation-induced lattice swelling. Thisphenomenon arises from the agglomeration of dislocation loops into adislocation network. Furthermore, our numerical framework enables us tocategorize the plastic transformation into two distinct types: pure slip eventsand slip events accompanied by lattice swelling. The latter type isparticularly responsible for the observed divergence in interstitial andvacancy counts, and also impacts the behavior of dislocations, potentiallyactivating non-conventional slip systems.

Atomistic Study of Irradiation-Induced Plastic and Lattice Strain in Tungsten