| Microstructure development in Al2O3-Y3Al5O12 nanocomposites |
| Paper ID : 1370-UFGNSM-FULL |
| Authors: |
| Abstract: |
| Development of microstructure during sol-gel synthesis of an alumina-YAG composite has been studied. Microstructural analysis has shown that YAG precipitates appear in two distinct forms, as follows: (a) isolated grains with an average size of about 0.5 m, and (b) nano-sized precipitates distributed evenly within alumina grains. Development of this characteristic microstructure is interpreted in view of a metastable phase diagram, incorporating a solvus between YAG and metastable alumina. Formation of isolated grains of YAG is considered to relate to this solvus. Accordingly, formation of nano-sized YAG precipitates is attributed to the drop in yttrium solubility, which occurs during the transition from metastable to stable alumina. |
| Keywords: |
| Alumina; Nanocomposite; Sol-gel preparation; Microstructure; Phase diagram |
| Status : Paper Accepted (Oral Presentation) |
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