Phase Equilibration in ZrO2-Y2O3 Alloys by Liquid-Film Migration |
| |
| Authors: | R. CHAIM A. H. HEUER D. G. BRANDON |
| |
| Affiliation: | Department of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio 44106;Department of Materials Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel |
| |
| Abstract: | The tetragonal ( t ) and cubic ( c ) ZrO2 solid solutions in two-phase ZrO2-8 wt% Y2O3 ceramics have low and high solute content, respectively. Annealing samples sintered at 1600°C between 700° and 1400°C requires a change in the volume fraction of the coexisting phases, as well as their equilibrium Y2O3 content. The enrichment in Y2O3 content of the c -ZrO2 grains is accomplished by liquid-film migration involving the ubiquitous silicate grain-boundary phase, while the volume fraction of t -ZrO2 increases by the nucleation and growth of cap-shaped t -ZrO2 lenses. The interfaces between the c -ZrO2 matrix and the growing t -ZrO2 lenses are semicoherent. |
| |
| Keywords: | |
|
|
