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Size Effects in LiF Micron-Scale Single Crystals of Low Dislocation Density

  • Edward M. Nadgorny (a1), Dennis M. Dimiduk (a2) and Michael D. Uchic (a3)

Abstract

This study examines the deformation response of 20, 5, and 1 micron diameter samples fabricated by FIB-milling from bulk ultrapure LiF single crystals. The bulk crystals have a very low initial dislocation density as revealed by an etch-pit technique. Two types of <001> microsamples were deformed preferentially by single slip when compressed inside a nanoindentation system. Similar to previously studied FCC-derivative metals, LiF microsamples demonstrate dramatic strengthening achieving the engineering flow stress σ ≈ 650 MPa in 1-μm samples. The stress-diameter dependence obeys a power law, σ ∼ Dm , where m ≈ 0.8. Stochastic variation of flow stress, fast intermittent deformation events (“avalanches”) and highly localized slip bands after avalanches - all characteristic of size effects in metals, are also observed in LiF. Possible dislocation mechanisms of the observed size effects are discussed.

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Size Effects in LiF Micron-Scale Single Crystals of Low Dislocation Density

  • Edward M. Nadgorny (a1), Dennis M. Dimiduk (a2) and Michael D. Uchic (a3)

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