ABSTRACT
Transformation and R-curve behaviours have been investigated in 9 mol % Ce-TZP ceramics with different grain sizes. Both single edge notched beam (SENB) and short double-cantilever-beam (s-DCB) specimens were tested to measure the crack-resistance curves. The size and shape of the transformation zone do not only depend on grain size, but are also strongly influenced by the specimen geometry. This different transformation behaviour has led to different crack-resistance curves. These experimental results are discussed in terms of the thermodynamics of transformation, the autocatalytic effect and fracture mechanics.
