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

Tension-compression asymmetry is a notable feature of plasticity in bcc single crystals. Recent experiments reveal striking differences in the plasticity of bcc nanopillars for tension and compression. Here we present results from molecular dynamics simulations of nanopillars of bcc Fe in tension and compression. We find that a totally different deformation mechanism applies in each cases: dislocation glide in compression and twinning in tension. This difference explains experimentally-observed asymmetry in the nanopillar morphology.

preprint2016arXivOpen access
Con HealyGraeme Ackland
cond-mat.mtrl-sci
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Open access2 authors1 topic
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Con HealyGraeme Ackland

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