|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||Effect of Specimen Dimension on Plasticity Behaviour Below Submillimetre Scale
||Arijit Lodh, Gustavo Castelluccio
|On-Site Speaker (Planned)
The mechanical response of metallic materials results from a complex hierarchy of deformation mechanisms across scales. Certainly, recent approaches aimed at predicting these responses of metals have innovated with the formulation and characterization of multiscale strengthening mechanisms. One of such mechanism originates on grains or sample boundaries, which limit the dislocation glide paths and results in the so-called Hall-Petch strengthening effect. However, limited experimental work has quantified the strengthening role for samples with cross sections between 50 μm to 500 μm.
In this presentation we first introduce a novel approach to manufacture and test sub-millimetre tensile samples. Various sized metallic samples were prepared using precision micro-milling to examine specimen size effect. The samples were deformed under monotonic deformation till fracture. For polycrystalline copper, the results present a dependence of the yield response on the sample dimension, which is analogous to that observed for different grain sizes.