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The mechanical behavior in compression of [111] LiF micropillars withdiameters in the range 0.5 $\mu$m to 2.0 $\mu$m was analyzed by means ofdiscrete dislocation dynamics at ambient and elevated temperature. Thedislocation velocity was obtained from the Peach-Koehler force acting on thedislocation segments from a thermally-activated model that accounted for theinfluence of temperature on the lattice resistance. A size effect of the type"smaller is stronger" was predicted by the simulations, which was inquantitative agreement with previous experimental results by the authors\cite{SWC14}. The contribution of the different physical deformation mechanismsto the size effect (namely, nucleation of dislocations, dislocation exhaustionand forest hardening) could be ascertained from the simulations and thedominant deformation mode could be assessed as a function of the specimen sizeand temperature. These results shed light into the complex interaction amongsize, lattice resistance and dislocation mobility in the mechanical behavior of$\mu$m-sized single crystals.

A 3D dislocation dynamics analysis of the size effect on the strength of [111] LiF micropillars at 300K and 600K