Tetragonal Phase in the System ZrO2-Y2O3
Abstract
Precipitates of the high-ZrO2 tetragonal distorted-fluorite phase in the system ZrO2-Y2O3 appear to be quite different from those observed in other well-studied partially stabilized zirconias (Mg-PSZ). In this paper, we discuss the nature of the tetragonal phase in Y2O3 partially stabilized zirconia (Y-PSZ) single crystals. We note that three versions of the phase diagram exist, which differ in detail mainly at the high-ZrO2 region; our work thus also sheds light on the subsolidus phase equilibria in this system. Scott 4 described a metastable 'nontransformable' high-Y2O3-content tetragonal ZrO2 solid solution (t-ZrO2), which he and other workers suggested formed from the cubic ZrO2 solid solution (c-ZrO2) via a displacive phase transformation; the nontransformability relates to its reluctance to undergo the stress-assisted martensitic transformation to monoclinic symmetry found in lower-Y2-O3-content t-ZrO2. (JES)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1985
- Accession Number
- ADA224505
Entities
People
- A. H. Heuer
- T. E. Mitchell
- V. Lanteri
Organizations
- Case Western Reserve University