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Indexed by:期刊论文

Date of Publication:2017-03-01

Journal:SCRIPTA MATERIALIA

Included Journals:SCIE、EI

Volume:129

Page Number:20-24

ISSN No.: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.