Deformation and Fracture of Corundum Ceramics with a Multilevel Pore Structure

Autor:	A. G. Burlachenko, S. N. Kul’kov, S. P. Buyakova, M. V. Grigor’ev
Rok vydání:	2019
Předmět:	010302 applied physics Materials science Physics and Astronomy (miscellaneous) Sintering Deformation (meteorology) Compression (physics) 01 natural sciences 010305 fluids & plasmas visual_art 0103 physical sciences Ultimate tensile strength Fracture (geology) visual_art.visual_art_medium Ceramic Composite material Porosity Microscale chemistry
Zdroj:	Technical Physics. 64:1803-1807
ISSN:	1090-6525 1063-7842
DOI:	10.1134/s1063784219120090
Popis:	The behavior of Al2O3 ceramics having a 50% volume of pore space under compression is studied. The porous structure includes three types of pores: large porosity with an average size of 120 μm, small porosity with an average size of 2 μm, and extended porous channels (about 150 μm) formed as a result of zonal separation during sintering. It is shown that at a load of ceramics with such a multilevel pore structure, the microdamage accumulates over the entire volume of the sample. It causes decreasing the scale level of fracture from microscopic (in the case of ceramics with unimodal pore structure) to meso- and microscale (for ceramics with a multilevel pore structure). Residual deformation in such material appears at small loads of about 0.3σc due to displacements of blocks and their groups during deformation before the ultimate strength.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::40ab2790f13976a3235aa0b7f4e6b5c9 https://doi.org/10.1134/s1063784219120090 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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