Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro

Muhammad Amir, Siegfried Schmauder

Research output: Contribution to conferencePaper

Abstract

Deformation and fracture at metal/ceramic interfaces are related to local processes at the crack tip. Internal interfaces play a prominent role in metal/matrix composites between ceramic (such as Al<sub>2</sub>O<sub>3-</sub>) particles and a metallic matrix, e.g. Al. Despite their widespread use, a basic understanding of these interfaces is still underway. The deformation behaviour of niobium single crystals is simulated using crystal plasticity theory. Good agreement between experiment and simulation results was found. The second part provides results on effects of the different niobium single crystalline material orientations on crack initiation energies. Crack propagation analyses of niobium/alumina bicrystal interface fracture are performed using a cohesive modelling approach for three different orientations of single crystalline niobium. Parametric studies are presented. The results show that cohesive strength has a stronger effect on the macroscopic fracture energy as compared to the work of adhesion. In the last part, a correlation among the macroscopic fracture energy, cohesive strength, work of adhesion and the yield stress of niobiu single crystalline material will be derived.

Conference

Conference2008 TMS Annual Meeting and Exhibition
CountryUnited States
CityNew Orleans
Period9/03/08 → …

Fingerprint

plastic properties
niobium
ceramics
metals
crystals
adhesion
metal matrix composites
bicrystals
crack initiation
crack tips
crack propagation
energy
aluminum oxides
single crystals
matrices
simulation

Keywords

  • crystal plasticity
  • macroscopic fracture energy

Cite this

Amir, M., & Schmauder, S. (2008). Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro. Paper presented at 2008 TMS Annual Meeting and Exhibition, New Orleans, United States.
Amir, Muhammad ; Schmauder, Siegfried . / Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro. Paper presented at 2008 TMS Annual Meeting and Exhibition, New Orleans, United States.
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Amir, M & Schmauder, S 2008, 'Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro' Paper presented at 2008 TMS Annual Meeting and Exhibition, New Orleans, United States, 9/03/08, .

Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro. / Amir, Muhammad; Schmauder, Siegfried .

2008. Paper presented at 2008 TMS Annual Meeting and Exhibition, New Orleans, United States.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro

AU - Amir, Muhammad

AU - Schmauder, Siegfried

PY - 2008

Y1 - 2008

N2 - Deformation and fracture at metal/ceramic interfaces are related to local processes at the crack tip. Internal interfaces play a prominent role in metal/matrix composites between ceramic (such as Al2O3-) particles and a metallic matrix, e.g. Al. Despite their widespread use, a basic understanding of these interfaces is still underway. The deformation behaviour of niobium single crystals is simulated using crystal plasticity theory. Good agreement between experiment and simulation results was found. The second part provides results on effects of the different niobium single crystalline material orientations on crack initiation energies. Crack propagation analyses of niobium/alumina bicrystal interface fracture are performed using a cohesive modelling approach for three different orientations of single crystalline niobium. Parametric studies are presented. The results show that cohesive strength has a stronger effect on the macroscopic fracture energy as compared to the work of adhesion. In the last part, a correlation among the macroscopic fracture energy, cohesive strength, work of adhesion and the yield stress of niobiu single crystalline material will be derived.

AB - Deformation and fracture at metal/ceramic interfaces are related to local processes at the crack tip. Internal interfaces play a prominent role in metal/matrix composites between ceramic (such as Al2O3-) particles and a metallic matrix, e.g. Al. Despite their widespread use, a basic understanding of these interfaces is still underway. The deformation behaviour of niobium single crystals is simulated using crystal plasticity theory. Good agreement between experiment and simulation results was found. The second part provides results on effects of the different niobium single crystalline material orientations on crack initiation energies. Crack propagation analyses of niobium/alumina bicrystal interface fracture are performed using a cohesive modelling approach for three different orientations of single crystalline niobium. Parametric studies are presented. The results show that cohesive strength has a stronger effect on the macroscopic fracture energy as compared to the work of adhesion. In the last part, a correlation among the macroscopic fracture energy, cohesive strength, work of adhesion and the yield stress of niobiu single crystalline material will be derived.

KW - crystal plasticity

KW - macroscopic fracture energy

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M3 - Paper

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Amir M, Schmauder S. Crystal plasticity and failure at metal/ceramic interfaces: from nano to macro. 2008. Paper presented at 2008 TMS Annual Meeting and Exhibition, New Orleans, United States.