Journal of Materials Science

, Volume 41, Issue 23, pp 7798–7807 | Cite as

Interface structure and strain development during compression tests of Al2O3/Nb/Al2O3 sandwiches



The interface structure of an Al2O3/Nb/Al2O3 sandwich produced by solid-state diffusion bonding was investigated in detail by various transmission electron microscopy (TEM) methods. The joint possessed at one interface a \( {\hbox{(110)}}_{{{{\rm Nb}}}} {{ \,||\, (0001)}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \), \( {\hbox{[1{{$\bar{1}$}}0]}}_{{{{\rm Nb}}}} {{ \,||\, [2{{\bar{1}}}{{\bar{1}}}0]}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \), and on the other interface a \( {\hbox{(1{{${1}$}}0)}}_{{{{\rm Nb}}}} {{ \,||\, (0001)}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \) and \( {\hbox{[1{{$\bar{1}$}}0]}}_{{{{\rm Nb}}}} {{ || [0{{\bar{1}}}{{\bar{1}}}0]}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \) orientation relationship. At both interfaces, misfit dislocations formed to compensate the lattice mismatch as found by high-resolution transmission electron microscopy (HRTEM). Electron energy-loss near edge structure (ELNES) studies revealed that the interface is terminating with an Al layer resulting in Al–Nb bonds. Identical sandwiches were investigated on the meso- and macroscopic scale by performing compression tests and simultaneously monitoring the strain development at (001)Nb and \( (1{{\bar{{{1}}}}}0)_{{\rm Nb}} \) crystal faces. The full-field optical strain measurements (FFOM) revealed that the strain is localized at the interfaces when observed at the (001)Nb face while it is along the maximum shear directions of 36–54° inclined to the interface when observed at the \( (1{{\bar{{{1}}}}}0) \) face. The strain localization along a specific maximum shear direction results in the cleavage of Al2O3, always initiating from the interface possessing the \( {\hbox{(110)}}_{{{{\rm Nb}}}} {{ \,||\, (0001)}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \) and \( {\hbox{[1{{$\bar{1}$}}0]}}_{{{{\rm Nb}}}} {{ \,||\, [0{{\bar{1}}}{{\bar{1}}}0]}}_{{{{\rm Al}}_{{{\rm 2}}} {{\rm O}}_{{{\rm 3}}} }} \) orientation relationship.


HRTEM ELNES Nb/Al2O3 interfaces Strain measurements 



Financial support by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged. The authors wish to thank M. Bartsch and U. Messerschmidt for a fruitful cooperation within the DFG project and F. Ernst for his contribution to the project application. Helpful discussions with R. Cannon are acknowledged. The authors thank W. Kurtz for the diffusion bonding of the specimen and U. Salzberger for the TEM specimen preparation. The authors also wish to thank G. Dehm for careful reading of the manuscript.


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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • C. Scheu
    • 1
    • 2
  • Y. Liu
    • 1
    • 3
  • S. H. Oh
    • 1
    • 4
  • D. Brunner
    • 1
  • M. Rühle
    • 1
  1. 1.Max-Planck-Institut für MetallforschungStuttgartGermany
  2. 2.Department Physical Metallurgy and Materials TestingMontanuniversität LeobenLeobenAustria
  3. 3.Institute for Physics & Centre for Micro- and NanotechnologyTechnische Universität IlmenauIlmenauGermany
  4. 4.Erich Schmid Institut für Materialwissenschaft, Österreichische Akademie der WissenschaftenLeobenAustria

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