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We conduct dislocation dynamics (DD) simulations of Fe periodic singlecrystals under tensile load at several high strain rates and temperatures. Thesimulations are enabled by the recent development of temperature-dependentdislocation mobility relations obtained from atomistic calculations. Theplastic evolution in the simulations is governed by rapid initial dislocationmultiplication, followed by a saturation of the flow stress when thesubpopulation of slow plastic carriers becomes stabilized by dislocationannihilation. Above 500 K, edge dislocations coexist with screw dislocationsand contribute proportionaly to the value of the flow stress. The DDsimulations are used to interpret shock-loading experiments in Fe in terms ofthe relative importance of different strengthening mechanisms. We find that inthe $10^4$-to-$10^6$ s$^{-1}$ strain rate regime, work hardening explains thehardening of shock-loaded bulk Fe crystals.

Temperature and high strain rate dependence of tensile deformation behavior in single crystal iron from dislocation dynamics simulations