Abstract
Small is strong – the yield stresses of thin metall23ic films with sub-micron thickness greatly exceed bulk values. While it is clear that this effect must be due to confinement effects on dislocation processes, the details of such mechanical finite size phenomena are complicated. Our recent In situ transmission electron microscopy studies combined with discrete dislocation dynamics simulations have shed some light on this problem. One conclusion is that the behavior of dislocations near interfaces affects the plasticity in small volumes in new ways which have not been foreseen by theoretical considerations so far. Another important aspect is the discovery of unexpected slip systems, which can be seen as indirect evidence for a constrained diffusional creep mechanism in polycrystalline films. Discrete dislocation simulations have allowed the operation of dislocation sources to be simulated under various boundary conditions. Based on these studies, we propose a new view of dislocation plasticity in thin films which, while being far from complete, seems to be more consistent with experimental observations and measurements.
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The authors would like to thank Prof. H. Gao for fruitful discussions. Dr. T. Wagner and his team from the “ZWE Dünnschichtlabor” are acknowledged for assistance with thin film deposition. G. D. and T. J. B. express thanks to B. Heiland, N. Tomic, and D. Cantarutti for preparation of certain TEM specimens, to Dr. F. Phillipp and his team from the “ZWE Hochspannungsmikroskopie”, and to Prof. M. Rühle for use of the TEM facilities. E. A. gratefully acknowledges financial support from the Deutsche Forschungsgemeinschaft (Leibniz Award). B. v. B. and P. G. gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (Gu 367/18).
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© 2002 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Max-Planck-Institut für Metallforschung
- Articles/Aufsätze
- Towards a micromechanical understanding of biological surface devices
- Solid state phase transformation kinetics: a modular transformation model
- Electronic structure investigations of Ni and Cr films on (100)SrTiO3 substrates using electron energy-loss spectroscopy
- Surface magnetization reversal of sputtered CrO2
- Magnetic imaging with full-field soft X-ray microscopy
- Dislocation dynamics in sub-micron confinement: recent progress in Cu thin film plasticity
- Fatigue behavior of polycrystalline thin copper films
- Grain growth in magnetron-sputtered nickel films
- Thin Pd films on SrTiO3 (001) substrates: ab initio local-density-functional theory
- Coupled grain boundary and surface diffusion in a polycrystalline thin film constrained by substrate
- Gallium segregation at grain boundaries in aluminium
- Current work at the Stuttgart UHV diffusion bonding facility
- Bonding between Cu and α-Al2O3
- Compressive deformation of niobium sandwich-bonded to alumina
- SiO2-coated carbon nanotubes: theory and experiment
- Simulation of solidification structures of binary alloys
- Gaseous nitriding of iron-chromium alloys
- Deposition of ceramic materials from aqueous solution induced by organic templates
- Notifications/Mitteilungen
- Personen
- Books
- Information
- DGM Further Training
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Max-Planck-Institut für Metallforschung
- Articles/Aufsätze
- Towards a micromechanical understanding of biological surface devices
- Solid state phase transformation kinetics: a modular transformation model
- Electronic structure investigations of Ni and Cr films on (100)SrTiO3 substrates using electron energy-loss spectroscopy
- Surface magnetization reversal of sputtered CrO2
- Magnetic imaging with full-field soft X-ray microscopy
- Dislocation dynamics in sub-micron confinement: recent progress in Cu thin film plasticity
- Fatigue behavior of polycrystalline thin copper films
- Grain growth in magnetron-sputtered nickel films
- Thin Pd films on SrTiO3 (001) substrates: ab initio local-density-functional theory
- Coupled grain boundary and surface diffusion in a polycrystalline thin film constrained by substrate
- Gallium segregation at grain boundaries in aluminium
- Current work at the Stuttgart UHV diffusion bonding facility
- Bonding between Cu and α-Al2O3
- Compressive deformation of niobium sandwich-bonded to alumina
- SiO2-coated carbon nanotubes: theory and experiment
- Simulation of solidification structures of binary alloys
- Gaseous nitriding of iron-chromium alloys
- Deposition of ceramic materials from aqueous solution induced by organic templates
- Notifications/Mitteilungen
- Personen
- Books
- Information
- DGM Further Training