Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-03-01

Journal: SCRIPTA MATERIALIA

Included Journals: EI、SCIE

Volume: 129

Page Number: 20-24

ISSN: 1359-6462

Key Words: Eutectic ceramic; Al2O3/ZrO2(Y2O3); Crystal growth; Constitutional supercooling

Abstract: The addition of more components are an interesting way of the microstructural controls. Herein, adding Y2O3 to Al2O3-ZrO2 bulk eutectic at the low G/v ratio (thermal gradient G divided by growth rate v) was adopted to tailor the morphology. As the Y2O3 content increases, the solidification structure changes obviously from cellular into the, dendritic shape. Especially, a typical irregular Al2O3/ZrO2/Y3Al5O12 (YAG) ternary eutectic appeared in the inter -colony region for the higher Y2O3 content. This microstructure transition is consistent with the classical constitutional supercooling criterion. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.