Characterization of residual compressive stresses in layered ceramics by positron annihilation spectroscopy Articles uri icon

publication date

  • December 2012

start page

  • 3989

end page

  • 3993

volume

  • 32

international standard serial number (ISSN)

  • 0955-2219

electronic international standard serial number (EISSN)

  • 1873-619X

abstract

  • Microstructural characterization of stress states of alumina layers subjected to residual compressive stresses was performed by positron annihilation spectroscopy (PAS). Al2O3-t-ZrO2 three layered samples were appropriately designed and processed by sequential slip casting with symmetric structure. The zirconia contents inside the core layer were selected in order to generate compressive stresses of variable intensity in the outer Al2O3 layers. PAS results highlighted a correlation between positron annihilation parameters and microstructural changes related to the generation of residual stresses.

keywords

  • residual stress; al2o3; positron annihilation spectroscopy