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- W2076643122 abstract "The deformation of micron-sized single-crystals is jumpy and stochastic, and this may pose potential formability and reliability problems if components for future micro-machines are to be made from small metal volumes. In this work, micron-sized bi-crystal pillars were fabricated by focussed ion-beam milling from grain-boundary regions in coarse-grained polycrystalline aluminium. Each bi-crystal pillar contained a grain boundary intersecting its top surface, and was subjected to compression using a flat-ended nanoindenter tip. Their deformation was found to have smaller strain bursts, fewer periods of strain hardening at elastic-like rates, as well as greater work-hardening rate and flow stress, than single-crystal pillars of similar sizes. Transmission electron microscopy revealed severe dislocation accumulation in the deformed bi-crystal pillars, whereas the residual dislocation density remained low in single-crystal micro-pillars of similar dimensions after deformation to comparable strains. The results suggest that a grain boundary inside a micro-specimen can trap dislocations inside the specimen, leading to a significant rise in the strain-hardening rate as well as to smoother deformation." @default.
- W2076643122 created "2016-06-24" @default.
- W2076643122 creator A5003695107 @default.
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- W2076643122 date "2009-11-21" @default.
- W2076643122 modified "2023-10-03" @default.
- W2076643122 title "Deformation of micron-sized aluminium bi-crystal pillars" @default.
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- W2076643122 doi "https://doi.org/10.1080/14786430903164614" @default.
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