Indentation cracking in mono and polycrystalline cubic zirconia: Methodology of an apparent fracture toughness evaluation

Autor: Ronan Henry, Nathalie Le Roux, Isabelle Zacharie-Aubrun, Jean-Marie Gatt, Cyril Langlois, Sylvain Meille
Přispěvatelé: Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), This research project was mainly funded by CEA and INSA-Lyon., EDF and Framatome
Rok vydání: 2022
Předmět:
Zdroj: Materials Science and Engineering: A
Materials Science and Engineering: A, 2022, 860, pp.144261. ⟨10.1016/j.msea.2022.144261⟩
ISSN: 0921-5093
DOI: 10.1016/j.msea.2022.144261
Popis: International audience; Indentation-induced cracking with sharp tips is studied on mono- and polycrystalline cubic zirconia. Tests at different applied loads are carried out, ranging below and above a threshold load above which visible surface cracking is noted after testing. This threshold load does not appear to be correlated to any discontinuity in the evolution of either the hardness or the irreversible energy ratio with applied load. The crystal orientation andthe presence of grain boundaries clearly affects the shape of the cracks generated around the residual imprint. Polycrystalline samples show significantly shorter indentation induced cracks and therefore a higher apparent toughness than single crystals for the same load. In addition, for single crystals, cracks are deflected towards {110} type planes, appearing to be the most susceptible to cracking, and thus logically presenting the lowestapparent toughness. Tests with a Berkovich tip leads to an average of different crystal orientations, while tests with a Vickers tip can be used to test a specific crystal orientation in the case of a cubic crystal such as zirconia.
Databáze: OpenAIRE
Externí odkaz: