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Tension-compression asymmetry is a notable feature of plasticity in bccsingle crystals. Recent experiments reveal striking differences in theplasticity of bcc nanopillars for tension and compression. Here we presentresults from molecular dynamics simulations of nanopillars of bcc Fe in tensionand compression. We find that a totally different deformation mechanism appliesin each cases: dislocation glide in compression and twinning in tension. Thisdifference explains experimentally-observed asymmetry in the nanopillarmorphology.

Molecular Dynamics Simulations of Compression-Tension Asymmetry in Plasticity of Fe Nanopillars