Crack Growth by the Isothermal Martensitic Phase Transformation in Tetragonal Zirconia Polycrystals

Abstract:

In this study, we investigated the crack nucleation and growth and propagation on the surface of Y-TZP during isothermal phase transformation by low temperature ageing. Crack initiation and growth on the surface of Y-TZP specimen was dependent on the sintered microstructure, i.e, sintered density, grain size, pore structure, residual stress etc.. In the case of Y-TZP with 2mol % yttria content, phase transformation of tetragonal to monoclinic began on the surface and induced a crack nucleation of specimen at the initial stage of low temperature ageing. Most of cracks in 2Y-TZP by low temperature ageing were firstly formed on the surface of specimens (free surface, weak bonding grains, etc.) where the change of strain free energy for a tetragonal to monoclinic transformation was small, and surface cracks grew into the bulk interior through the grain boundaries.

• Periodical: Materials Science Forum (Volumes 738-739)
• Pages: 537-541
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.738-739.537
• Online since: January 2013
• Authors: Kyu Hong Hwang, Jong Kook Lee
• Keywords: Crack Growth, Isothermal Phase Transformation, Tetragonal Zirconia Polycrystals

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