Comparative studies of mechanical properties of stishovite and sapphire single crystals by nanoindentation

Autor:	Sergey Dub, G.N. Tolmachova, T. I. Dyuzheva, L. M. Lityagina, P. M. Litvin, N. V. Novikov, Vadim V. Brazhkin
Rok vydání:	2010
Předmět:	Materials science Mineralogy Nanoindentation Inorganic Chemistry Lattice (order) visual_art Sapphire visual_art.visual_art_medium General Materials Science Ceramic Crystallite Composite material Nanoscopic scale Softening Stishovite
Zdroj:	Journal of Superhard Materials. 32:406-414
ISSN:	1934-9408 1063-4576
Popis:	Comparative nanoindentation tests of stishovite and sapphire single crystals have been performed. It has been found that nanohardness of the (0001) plane of sapphire at a depth of 200 nm is 29.1 ± 0.1 GPa, while the nanohardness of the (110) plane of stishovite is 38.1 ± 0.6 GPa, the tests conditions being the same. The specifics of elastoplastic transition in sapphire and stishovite single crystals and alumina-based polycrystalline ceramic when plastic deformation is localized in a submicron region have been studied. Anomalous elastoplastic transition in stishovite has been revealed. A possibility that anomalous mechanical behavior of stishovite at the nanoscale may be due to a strong softening of the lattice as a precursor of the formation of a post-stishovite phase of silica with the CaCl2 structure in an indent has been discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::01d1d144b76a54c5e6edfa08ec94c478 https://doi.org/10.3103/s1063457610060067 Zobrazit plný text záznamu Full text from SpringerLink