Publication:
Effect of high-temperature aging on the fracture toughness of ytterbia-stabilized t′ zirconia

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Date
01-08-2012
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Research Projects
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Abstract
Dense t′ ZrO 2-8 mol.% YbO 1.5 candidate thermal barrier material was aged for 192 h at 1150 and 1250 °C. The high initial indentation toughness (∼87 J m -2) reduced by ∼56% in early-stage aging at both temperatures. The toughness increased gradually with aging at 1150 °C and more rapidly at 1250 °C. Precipitation of the cubic phase and its transformation to t″ during cooling was observed. Transformation toughening was activated by 192 h at 1250 °C. Ferroelastic toughening was dominant in the absence of transformation toughening. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Coatings, Phase transformation, Spark plasma sintering, Toughness, Ytterbia-stabilized zirconia
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