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Damage tolerance and R-curve behavior of Al2O3–ZrO2–Nb multiphase composites with synergistic toughening mechanism

Published online by Cambridge University Press:  31 January 2011

C.F. Gutiérrez-González
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (CSIC), 28049 Madrid, Spain
J.F. Bartolomé*
Affiliation:
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (CSIC), 28049 Madrid, Spain
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

In the present work, the damage tolerance and R-curve behavior of alumina–zirconia–niobium multiphase composites were studied by the indentation strength method. A matrix of yttria-stabilized zirconia (3Y–TZP) strengthened with particles of Al2O3 (ATZ) and an alumina matrix strengthened with particles of 3Y-TZP (ZTA) were prepared by hot press of commercial powders, containing Nb metal particles as reinforcing phase. The crack growth behavior was analyzed, and it was found that stress-induced transformation toughening of ZrO2 and bridging of the Nb inclusions were the two main factors that can shield an advancing crack and exert crack closure stresses on the crack wake. Moreover, on the basis of quantitative toughening analysis, it is argued that a synergistic effect originated from the interaction between the toughening mechanisms of Nb grains and zirconia, takes place in the alumina–zirconia–Nb multiphase composites. This showed that the combined toughening effect was bigger than the sum of the individual toughening effects when either reinforcement acted alone.

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Articles
Copyright
Copyright © Materials Research Society 2007

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