Abstract
Acoustic emission (AE) of a Mg‐PSZ (TS grade) material has been studied during three‐ and four‐point bending and stable macrocrack extension tests. During flexure, AE signals increased significantly upon the onset of nonlinear stress‐strain behavior and were associated with phase transformation and microcracking on the tensile surface. Observations of crack extension in notched bars revealed relatively little AE during initial loading and onset of non‐linear behavior. However, on subsequent loadings, the number of counts was in reasonable agreement with the extent of crack growth. These observations are discussed in terms of AE from phase transformation and crack growth at different grain size. They are compared with AE behavior of other zirconia‐based materials.
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