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Fracture behaviour of an Al 2 O 3 –ZrO 2 multi‐layered ceramic with residual stresses due to phase transformations *
Author(s) -
BERMEJO R.,
TORRES Y.,
SÁNCHEZHERENCIA A. J.,
BAUDÍN C.,
ANGLADA M.,
LLANES L.
Publication year - 2006
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.2006.00962.x
Subject(s) - materials science , composite material , residual stress , indentation , fracture toughness , ceramic , flexural strength , fractography , slip (aerodynamics) , fracture mechanics , cubic zirconia , physics , thermodynamics
The fracture behaviour of a ceramic multi‐layer designed with thin internal compressive layers and obtained by slip casting is studied. It consists of nine alternated Al 2 O 3 –5vol%tZrO 2 and Al 2 O 3 –30vol%mZrO 2 layers of 530 μm and 100 μm thickness, respectively. Mechanical characterization includes evaluation of Vickers Hardness, Young's modulus and fracture strength under four‐point bending. In addition, the residual stress magnitude and distribution in the laminate is determined both analytically, from calculations using the differential strain between layers and the elastic properties, and experimentally, using indentation techniques. The experimental findings in terms of mechanical strength and fractography show a subcritical growth of the natural flaws in the laminate before catastrophic failure occurs, owing to the relevant role of the thin Al 2 O 3 –30vol%mZrO 2 layers with compressive stresses inherent to the zirconia phase transformation. These layers are also responsible for the increase in toughness to levels of at least three times that of the reference Al 2 O 3 –5vol%tZrO 2 monolith.