"\u0158e\u0161en\u00ED projektu p\u0159ineslo \u0159adu v\u00FDznamn\u00FDch poznatk\u016F. Byla vyvinuta technika p\u0159\u00EDpravy bikrystal\u016F slitin se zkrutovou hranic\u00ED zrn sm\u011Brov\u00FDm tuhnut\u00EDm a nalezeny podm\u00EDnky jejich homogenizace. Byla nalezena p\u0159\u00EDm\u00E1 z\u00E1vislost mezi lomovou hou\u017Eevnatost\u00ED a chemick\u00FDm"@cs . . "15"^^ . "GA106/02/0253" . . "15"^^ . . . . "Modern\u00ED p\u0159\u00EDstup k v\u00FDrob\u011B polykrystalick\u00FDch materi\u00E1l\u016F v r\u00E1mci koncepce In\u017Een\u00FDrstv\u00ED hranic zrn vy\u017Eaduje detailn\u00ED znalost chov\u00E1n\u00ED jednotliv\u00FDch hranic zrn. Na z\u00E1klad\u011B jejich klasifikace lze toti\u017E navrhnout takov\u00E9 uspo\u0159\u00E1d\u00E1n\u00ED rozhran\u00ED, kter\u00E9 poskytuje optim\u00E1ln\u00ED vlastnosti. Anizotropie vlastnost\u00ED hranic zrn a jejich klasifikace v\u0161ak nejsou dosud \u00FApln\u011B zn\u00E1m\u00E9. P\u0159i p\u0159echodu od bikrystal\u016F k polykrystal\u016Fm se je\u0161t\u011B vyskytuj\u00ED dal\u0161\u00ED komplikace spojen\u00E9 s koexistenc\u00ED mnoha rozhran\u00ED a jejich styk\u016F. Abychom zodpov\u011Bd\u011Bli mnoh\u00E9 st\u00E1le otev\u0159en\u00E9 ot\u00E1zky t\u00FDkaj\u00EDc\u00ED se t\u00E9to problematiky, navrhujeme v tomto projektu jako hlavn\u00ED c\u00EDl nal\u00E9zt p\u0159\u00EDm\u00FD a kvantitativn\u00ED vztah mezi segregac\u00ED p\u0159\u00EDm\u011Bs\u00ED na hranic\u00EDch zrn a k\u0159ehk\u00FDm lomem, kter\u00FD je jednou z\u00A0nejv\u00E1\u017En\u011Bj\u0161\u00EDch p\u0159\u00ED\u010Din destrukce materi\u00E1l\u016F. Studium tohoto vztahu bude prov\u00E1d\u011Bno na bikrystalech a polykrystalech slitiny na b\u00E1zi Fe-Si, nebo\u0165 s t\u00EDmto materi\u00E1lem m\u00E1me dobr\u00E9 experiment\u00E1ln\u00ED zku\u0161enosti jak p\u0159i p\u0159\u00EDprav\u011B krystalograficky a strukturn\u011B charakterizovan\u00FDch bikrystal\u016F," . . . . . "0"^^ . "Anal\u00FDza lomu pod\u00E9l segregovan\u00FDch hranic zrn v bikrystalech a polykrystalech" . "The solution of the project brought some important results. The technique was developed for growing alloy bicrystals with twist grain boundaries by means of the directional solidification method, and the conditions of their homogenization were determined"@en . . "1"^^ . . "1"^^ . . "http://www.isvav.cz/projectDetail.do?rowId=GA106/02/0253"^^ . "Analysis of fracture along segregated grain boundaries in bicrystals and polycrystals"@en . . . . "Modern approach to production of polycrystalline materials via Grain Boundary Engineering requires detail knowledge of behaviour of individual grain boundaries. Based on their classification, an arrangement of interfaces can be proposed to create such a structure possessing optimum behaviour. However, the anisotropy of grain boundary properties and their classification are not known completely at present. Moreover, additional complications can occur in a polycrystal, connected to collective coexistence of many interfaces and their junctions as compared to a single grain boundary in bicrystal. To answer numerous open questions related to this problem, the main aim of the present project is to find the direct quantitative link between grain boundary segregation and brittle fracture that is one of the most serious origins of materials destruction. The study of this problem will be performed on Fe-Si base alloy since we have good experimental experience with production of crystallographically and"@en . . . "2008-06-02+02:00"^^ . "Neuvedeno."@en . . .