Abstract
Departement de Physique, Ecole Polytechnique Fe’derale de Lausanne, CH-1015 Lausanne,Switzerland(Received December 15, 1998)(Accepted January 8, 1999)1. IntroductionSince the discovery of transformation toughening in zirconia ceramics (1), material scientists have useddifferent tools to effectively characterise (2,3,4) such martensitic transformations with the aim to exploitthem in the development of high toughness ceramic matrix composites. The various experimental toolsthat researchers have already employed to investigate the transformation in doped zirconia are XRD (5),Raman spectroscopy (6), acoustic emission (7), optical interference microscopy (4), TEM (3). As themartensitic transformation in zirconia involves a finite amount of dilatational strain, materials scientistshave used thermal expansion measurements (8–11) to detect the onset of the transformation (Ms). Butno work, known to the authors’, reports on the transformation related damping behaviour in theyttria-zirconia system. Earlier mechanical spectroscopy measurements on tetragonal yttria stabilizedzirconia have shown that there is a mechanical loss peak located around 100–200°C accompanied bya decrease in the elastic modulus (12–16). This phenomenon has been interpreted as due to the stressinduced reorientation of (Yzr9Vo
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