Abstract
We investigated the size-dependent mechanical responses of a polycrystalline body-centered cubic bulk VNbTaMoW alloy compositionally-enriched with carbon and nitrogen. Uniaxial compression of cylindrical pillars revealed that they deform plastically with size-dependent increases in yield strengths and displacement bursts and decrease in strain hardening with decreasing diameter. We suggest that the increase in yield strengths with decreasing diameter is likely due to a change in dislocation density and attribute the observed size-dependence in strain hardening to dislocation generation and pile-up at grain boundaries, intrinsic to polycrystalline samples.
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