. . "V projektu byla \u00FAsp\u011B\u0161n\u011B p\u0159ipravena \u0159ada ultrajemnozrnn\u00FDch kovov\u00FDch materi\u00E1l\u016F, provedena charakteristika jejich mikrostruktury a v\u00FDvoje mikrostruktury s rostouc\u00ED teplotou. Teplotn\u00ED stabilita t\u011Bchto materi\u00E1l\u016F byla zlep\u0161ena p\u0159id\u00E1n\u00EDm keramick\u00FDch nano\u010D\u00E1stic."@cs . "ultra fine grained materials; thermal stability; defects; positron annihilation spectrocopy"@en . "LZ1K03025" . "UK-\u010C\u00ED\u017Eek"@en . . "2008-05-29+02:00"^^ . " thermal stability" . . "4"^^ . "0"^^ . . "4"^^ . "1"^^ . . . . . "0"^^ . "A number of ultra fine grained metallic materals were successfully prepared in the project. Microstructure of these materials and its thermal development were characterized. Ceramic nanoparticles were used to improve thermal stability of the materials."@en . . . . . "ultra fine grained materials" . "Defects in ultra fine grained (UFG) materials will be studied in the proposed project. UFG materials exhibit significant volume fraction of grain boundaries, which results in a number of unusual physical propertiesDefects in UFG materials prepared by various methods will be identified. Influence of these defects on physical properties of UFG materials will be investigated. The defect studies will be performed by positron annihilation spectroscopy.UFG structure represents highly non-equilibrium kind of structure. Therefore, it recovers towards more equilibrium one with increasing temperature. Thermal stability of UFG structure will be studied in the proposed project.The processes of thermal recovery of UFG structure will be elucidated and corresponding temperature ranges will be determined. Moreover, selected methods proposed for enhancement of thermal stability of UFG materials will be tested."@en . "Studium defekt\u016F v ultra jemnozrnn\u00FDch materi\u00E1lech" . . . . " defects" . "http://www.isvav.cz/projectDetail.do?rowId=LZ1K03025"^^ . . . "V navrhovan\u00E9m projektu budou studov\u00E1ny defekty v ultra jemnozrnn\u00FDch (UFG) materi\u00E1lech. D\u00EDky zna\u010Dn\u00E9mu objemov\u00E9mu pod\u00EDlu hranic zrn, vykazuj\u00ED tyto materi\u00E1ly \u0159adu neobvykl\u00FDch fyzik\u00E1ln\u00EDch vlastnost\u00ED.Bude provedena charakterizace defekt\u016F v UFG materi\u00E1lech p\u0159ipraven\u00FDch r\u016Fzn\u00FDmi metodami a studium vlivu t\u011Bchto defekt\u016F na fyzik\u00E1ln\u00ED vlastnosti UFG materi\u00E1l\u016F. Studium defekt\u016F bude realizov\u00E1no pomoc\u00ED pozitronov\u00E9 anihila\u010Dn\u00ED spektroskopie.UFG struktura p\u0159edstavuje siln\u011B nerovnov\u00E1\u017En\u00FD typ struktury. S rostouc\u00ED teplotou doch\u00E1z\u00ED k zotaven\u00ED UFG struktury sm\u011Brem k v\u00EDce rovnov\u00E1\u017En\u00E9 konfiguraci. V tomto projektu bude zkoum\u00E1na teplotn\u00ED evoluce UFG struktury studovan\u00FDch vzork\u016F.Budou osv\u011Btleny procesy, kter\u00FDmi doch\u00E1z\u00ED k zotaven\u00ED UFG struktury a ur\u010Deny teplotn\u00ED intervaly, kdy prob\u00EDhaj\u00ED. D\u00E1le budou testov\u00E1ny n\u011Bkter\u00E9 zp\u016Fsoby navrhovan\u00E9 na zv\u00FD\u0161en\u00ED teplotn\u00ED stability UFG materi\u00E1l\u016F." . . . .