High temperature deformation of ceramic particle composites

Autor:	Władysław Wesołowski, Marek Boniecki, Zdzislaw Librant
Rok vydání:	2012
Předmět:	Materials science Composite number Superplasticity Strain rate Creep visual_art Volume fraction Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Cubic zirconia Ceramic Composite material Deformation (engineering)
Zdroj:	Journal of the European Ceramic Society. 32:1-8
ISSN:	0955-2219
DOI:	10.1016/j.jeurceramsoc.2011.07.001
Popis:	The particle composites Al 2 O 3 /(2 and 3Y)TZP and MgAl 2 O 4 /3Y-TZP were tested in bending at temperature of 1280 °C over strain rates from 3.4 × 10 −7 to 1 × 10 −4 s −1 and over stresses from 23 to 85 MPa. Strain rate of the composites decreased as a volume fraction of Al 2 O 3 or MgAl 2 O 4 increased. MgAl 2 O 4 /3Y-TZP composites deformed easier under the comparable conditions than alumina/zirconia composites. Four models of composite creep behaviour were compared to the experimental data. All the models were unsuitable for MgAl 2 O 4 /3Y-TZP, in turn an isostress, an isostrain and a constrained isostrain models provide the good predictions for creep rates for alumina/zirconia ceramics, but the rheological model appeared not good. The threshold stresses approach seems to be useful for describing superplastic flow of MgAl 2 O 4 /3Y-TZP composites.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7a17ef3e9d6f20b26f0f676b10c68a8a https://doi.org/10.1016/j.jeurceramsoc.2011.07.001 Zobrazit plný text záznamu Full Text from ScienceDirect