"There are three main objectives of the proposed research: (i) a (positive) effect of the Nb additions on the strength, ductility, fracture toughness, creep resistance and low cycle fatigue strength of near-gamma TiAl alloys should be assessed and explained on the microstructural basis, (ii) a relation between mechanical characteristics of the Nb-alloyed TiAl (over 2 at% of Nb) and the alloy processing route will be rationalized for the combination of induction skull melting (ISM) and remelting invacuum induction furnace furnished with a refractory crucible (VIM) and (iii) the application potential of the new class of intermetallics will be demonstrated in investment casting trials (turbocharger wheels) with the Ti-46Al-7Nb-x-x alloy. The proposed project builds upon results obtained by the applicant and co-applicant in last eleven years in systematic studies of the high temperature strength, microstructure and physical metallurgy of the near-gamma TiAl alloys. Now, with the advent of a"@en . . "2009-12-31+01:00"^^ . "27"^^ . "1"^^ . "5658"^^ . "1"^^ . . "Struktura, vlastnosti a metalurgie t\u00E9m\u011B\u0159 stechiometrick\u00FDch slitin TiAl"@cs . "Structure, properties and metallurgy of near-gamma TiAl alloys"@en . . "Intermetallics; TiAl; structure; mechanical properties; metallurgy"@en . . . . . . "2007-01-01+01:00"^^ . . . "0"^^ . "Navrhovan\u00FD projekt si klade t\u0159i z\u00E1kladn\u00ED c\u00EDle: (i) vyhodnotit a na mikrostrukturn\u00EDm z\u00E1klad\u011B vysv\u011Btlit (pozitivn\u00ED) vliv obsahu Nb na pevnost, ta\u017Enost, lomovou hou\u017Eevnatost, pevnost p\u0159i creepu a n\u00EDzko-cyklov\u00E9 \u00FAnav\u011B t\u00E9m\u011B\u0159 stechiometrick\u00FDch slitin TiAl, (ii)vysv\u011Btlit z\u00E1vislost mechanick\u00FDch vlastnost\u00ED slitin TiAl s\u00A0vy\u0161\u0161\u00EDm obsahem Nb (nad 2 at%) na zp\u016Fsobu jejich p\u0159\u00EDpravy metodou ISM (induction skull melting) nebo kombinac\u00ED ISM a n\u00E1sledn\u00E9ho p\u0159etaven\u00ED ingotu ve vakuov\u00E9 induk\u010Dn\u00ED peci vybaven\u00E9 keramick\u00FDm kel\u00EDmkem (VIM proces) a (iii) prok\u00E1zat aplika\u010Dn\u00ED potenci\u00E1l nov\u00E9 generace TiAl intermetalik p\u0159\u00EDpravou demonstra\u010Dn\u00EDch odlitk\u016F turb\u00EDnov\u00FDch kol turbodmychadel ze slitiny Ti-46Al-7Nb-x-x. Navrhovan\u00FD projekt vych\u00E1z\u00ED z v\u00FDsledk\u016F dosa\u017Een\u00FDch v\u00A0uplynul\u00FDch jeden\u00E1ctiletech na pracovi\u0161ti uchaze\u010De a spoluuchaze\u010De p\u0159i systematick\u00E9m v\u00FDzkumu vysokoteplotn\u00ED pevnosti, mikrostruktury a metalurgie intermetalick\u00FDch slitin na b\u00E1zi TiAl. Nyn\u00ED, vzhledem k\u00A0potenci\u00E1lu nov\u00E9 t\u0159\u00EDdy intermetalik s\u00A0vy\u0161\u0161\u00EDm obsahem Nb, se otv\u00EDr\u00E1 mo\u017Enost"@cs . "5658"^^ . . . "27"^^ .