Compressive deformation of niobium sandwich-bonded to alumina
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Y. Liu
Abstract
The deformation behavior of polycrystalline niobium with a thickness of 0.7 –2.8 mm sandwich-bonded to alumina was studied by using surface strain mapping during compressive deformation. A full-field optical strain measurement technique was employed in determining the 3-dimensional displacement and strain fields for one side surface of the bonded Nb layer, including the interfaces. The measured stress – strain curves consist of three well-defined stages of elastic deformation, yielding, and plastic deformation with hardening until fracture of alumina. Strain and displacement maps for each stage illustrate that the deformation of bonded Nb is highly influenced by the constraints from the interfaces. The yielding of Nb starts from the immediate vicinity of interfaces and extends to the whole metal layer. After yielding, strain localization maintains at the interfaces until interface debonding or fracture of alumina occurs. The strain localization at interfaces is discussed with respect to the microstructures, edge and corner effect, and the stress triaxiality near the interfaces. It is proposed that the voids at the interfaces and the stress triaxiality near an interface lead to the strain localization. The influence of the strain localization on the mechanical properties is also discussed.
Abstract
Zur Untersuchung der mechanischen Eigenschaften von Metall/Keramik-Verbunden wurden vielkristalline Niobplättchen mit Dicken zwischen 0,7 und 2,8 mm, die mit vielkristallinem Aluminiumoxid diffusionsverschweißt waren, im Druckversuch verformt. Ein optisches Messverfahren zur flächenhaften Verschiebungs- und Dehnungsanalyse diente der lokalen und integralen Dehnungsmessung, angewandt auf eine Seitenfläche des Nb-Plättchens, wobei hier speziell die Erfassung dreidimensionaler Dehnungen möglich war. Die gemessenen Spannung – Dehnungs-Kurven weisen drei wohldefinierte Bereiche auf, die sich in elastisch und plastische Verformung des Nb und Bruch des Aluminiumoxid unterteilen lassen. Dehnungs- und Verschiebungsbilder aus den Bereichen zeigen, dass die Verformung des diffusionsverschweißten Nb stark beeinflusst ist durch die Zwangsbedingungen der Metall/Keramik-Grenzfläche. Das plastische Fließen des Nb beginnt in unmittelbarer Nähe der Grenzfläche, von wo aus es sich auf die gesamte Metallschicht ausdehnt. Nach Beginn des plastischen Fließens bleibt die Dehnungslokalisierung an der Grenzfläche bestehen bis zum Grenzflächenriss oder Bruch des Aluminiumoxids. Die Dehnungslokalisierung an der Metall/Keramik-Grenzfläche wird diskutiert im Hinblick auf ihre Mikrostruktur, Eckeffekte und den dreiachsigen Spannungszustand in der Nähe der Grenzfläche. Es wird vorgeschlagen, dass Poren an den Grenzflächen und der dreiachsige Spannungszustand in der Nähe der Grenzfläche zur Dehnungslokalisation führen, und deren Einfluss auf die mechanische Eigenschaften wird diskutiert.
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The authors gratefully acknowledge the assistance of Dr. C. Kohnle in the compression tests and the application of ARAMIS software as well as stimulating discussions with Prof. M. Rühle and Prof. S. Schmauder.
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© 2002 Carl Hanser Verlag, München
Artikel in diesem Heft
- 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
Artikel in diesem Heft
- 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
