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Título

Microstructural stability and orientation relationships of directionally solidified Al2O3-Er3Al5O12-ZrO2 eutectic ceramics up to 1600°C

AutorMesa, M. Cristina; Serrano-Zabaleta, S.; Oliete, Patricia B.; Larrea, A.
Palabras claveAl2O3/Er3Al5O12/ZrO2
Orientation relationships
Microstructural stability
Coarsening
Directionally solidified eutectic ceramics
Fecha de publicación2014
EditorElsevier
CitaciónJournal of the European Ceramic Society 34(9): 2071-2080 (2014)
ResumenAl2O3-Er3Al5O12-ZrO2 eutectic ceramic rods were directionally solidified using the laser floating zone method at different growth rates, 25, 350 and 1200mm/h. The microstructure obtained, in terms of both morphology and phase size, was strongly dependent on the growth rate. However, electron backscatter diffraction experiments showed that the growth directions were the same for all the processing rates, [0001]Al2O3//[100]EAG//[100]ZrO2. The microstructural stability was investigated up to 1600°C as a function of the growth rate. Ceramics with the largest phase size presented high stability, their microstructure remaining substantially unchanged at the highest annealing temperature for 100h. Eutectics processed at higher growth rates and with a finer microstructure showed coarsening after heat treatments. The sample grown at 350mm/h coarsened at 1450°C whereas the eutectic solidified at 1200mm/h thickened at 1400°C. The growth directions remain unaffected for all growth rates. The mechanisms of microstructural coarsening were investigated. © 2014 Elsevier Ltd.
DescripciónDirectionally Solidified Eutectics: Selected Papers from DSEC IV.
Versión del editorhttp://dx.doi.org/10.1016/j.jeurceramsoc.2013.11.011
URIhttp://hdl.handle.net/10261/120293
DOI10.1016/j.jeurceramsoc.2013.11.011
Identificadoresdoi: 10.1016/j.jeurceramsoc.2013.11.011
issn: 0955-2219
e-issn: 1873-619X
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