期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.08.015
关键词
Micromechanics; Crystal plasticity; Size effect; Bcc; Ultrafine-grained; In-situ SEM
类别
资金
- Austrian Federal Government [P25325-N20]
- Austrian Federal Government (Bundesministerium fur Verkehr, Innovation und Technologie) [837900]
- Austrian Federal Government (Bundesministerium fur Wirtschaft, Familie und Jugend) [837900]
- Styrian Provincial Government
- Tyrolean Provincial Government
- Austrian Science Fund (FWF) [P 25325] Funding Source: researchfish
- Austrian Science Fund (FWF) [P25325] Funding Source: Austrian Science Fund (FWF)
To gain insights into the influence of the microstructure on the strengthening behaviour in confined volumes, single crystalline (sxx) and ultrafine-grained (ufg) Cr micropillars were investigated using in-situ scanning electron microscope microcompression tests. Post-compression images of the sxx pillars indicate crystallographic slip, while the ufg pillars reveal a bulk-like deformation behaviour and an emergence of grains from the sample surface. Stress-strain curves of sxx samples show intermittent flow and a scaling behaviour agreeing well with other bcc metals investigated previously. Also for ufg samples a size-dependent strength with a reduced but non-negligible scaling exponent is determined. This latter ufg size effect contributes to an increasing influence of near-surface grains controlling plastic flow with decreasing pillar diameter. While for micron-sized pillars the strength differs between the two microstructures, the two scaling trends converge for sub-micron pillars with diameters close to the grain size, indicative of a transition from boundary-mediated to single crystal plasticity. (C) 2016 The Authors. Published by Elsevier B.V.
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