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Transient dopant segregation and precipitation in yttrium-doped alumina

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Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 12

Abstract

Ultra-pure AI2O3 ceramics doped with 2000 ppm of Y2O3 were sintered at 1500 °C or 1650 °C for 2 or 12 h. The re-sulting microstructure consisted of alumina matrix grains and second-phase precipitates. Y-doped alumina samples sintered at 1550 °C for shorter times (<2 h) contained primarily YAIO3-YAP precipitates. This is in contradiction of the binary equilibrium phase diagram for AI2O3 and Y2O3, which predicts Y3AI5O12- YAG to be the first phase to appear, as the Y-concentration exceeds the solubility limit of α-A12O3. The formation of YAG in co-existence with the YAP precipitates was observed in samples sintered at 1550°C for 12h and 1650°C for 2 h. The excess of yttrium in the grain boundary was 5.5 ± 0.9 Y-atoms/nm2 for the specimen containing primarily YAP and 4.2 ± 1.2 Y-atoms/nm2 in samples where YAP and YAG co-existed. The study demonstrates that in samples containing multiple precipitates, the grain-boundary excess concentration of Y atoms is controlled by the composition of the precipitates.

Keywords: Precipitation; Grain boundary segregation; Interfaces; Electron energy loss spectroscopy (EELS); YAP/YAG
∗ Correspondence address, Assoc. Prof. Mehmet Ali Gülgün, Sabanci University, FENS, Orhanli, Tuzla, Istanbul 34956, Turkey, Tel.: +90216 4839536, Fax: +90216 4839550. E-mail:

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Received: 2008-8-27
Accepted: 2008-9-19
Published Online: 2013-05-18
Published in Print: 2008-12-01

© 2008, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101767
Keywords for this article
Precipitation; Grain boundary segregation; Interfaces; Electron energy loss spectroscopy (EELS); YAP/YAG

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial December 2008
  5. Basic
  6. Thermodynamic description of the C-Fe-Mn system with key experiments and its practical applications
  7. A study of phase equilibria in the Al-rich part of the Al-Mn alloy system
  8. Transient dopant segregation and precipitation in yttrium-doped alumina
  9. Experimental study on gallium activity in the liquid Ga-Bi-Sn alloys using the EMF method with zirconia solid electrolyte
  10. Modeling of the hot deformation behavior of boron microalloyed steels under uniaxial hot-compression conditions
  11. A new kinetic treatment of the oxidation of β-SiAlON powder
  12. Quantification of ∊-martensite after thermocycling in Fe-(17∼25)Mn alloys
  13. The effect of pre-structure process on magnetorheological elastomer performance
  14. Applied
  15. Corrosion protective double layer hard coatings
  16. Interpretation of inorganic melts' surface properties on the basis of chemical status and structural relations
  17. Basic
  18. Achieving ultra-fine grains in AZ61 Mg alloy by friction stir processing
  19. The combined effect of titanic carbide and aluminum phosphide on the refinement of primary silicon in Al-50Si alloy
  20. Applied
  21. The role of solidification conditions on the microstructural features of AA6111 aluminum strips cast on a horizontal single belt caster
  22. Far infrared spectroscopy of Pb0.85Sn0.15Te alloy doped with Ni
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