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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F11%3A86080868%21RIV12-MSM-27360___
rdf:type
skos:Concept n18:Vysledek
dcterms:description
Mechanical properties of alloys based on TiAl, especially toughness at room temperature and resistance to creep, depend significantly on the microstructure. Alloys with fully lamellar or nearly lamellar microstructure are characterized by higher resistance to creep and higher toughness, compared to alloys with duplex microstructure, but they have lower ductility and plasticity. Particularly low ductility at room temperature is a typical feature of γ-TiAl alloys, which prevents its wider use. Another drawback of these alloys is smaller oxidation resistance at the temperatures above 700 oC. Impurities, such as oxygen, cause drop in mechanical properties and it is very difficult to prevent contamination due to the high affinity between metals and oxygen. Alloying with a small amount of yttrium is one of the possibilities to improve oxidation resistance and mechanical properties of γ-TiAl alloys. The purpose of the present work is to investigate the effect of yttrium on the dendritic structure, particularly on the dendrite arm spacing of cast alloy TiAl. It is generally known, that reducing the dendrites arms spacing leads to an increase of mechanical properties and to reduction of segregation distances. Mechanical properties of alloys based on TiAl, especially toughness at room temperature and resistance to creep, depend significantly on the microstructure. Alloys with fully lamellar or nearly lamellar microstructure are characterized by higher resistance to creep and higher toughness, compared to alloys with duplex microstructure, but they have lower ductility and plasticity. Particularly low ductility at room temperature is a typical feature of γ-TiAl alloys, which prevents its wider use. Another drawback of these alloys is smaller oxidation resistance at the temperatures above 700 oC. Impurities, such as oxygen, cause drop in mechanical properties and it is very difficult to prevent contamination due to the high affinity between metals and oxygen. Alloying with a small amount of yttrium is one of the possibilities to improve oxidation resistance and mechanical properties of γ-TiAl alloys. The purpose of the present work is to investigate the effect of yttrium on the dendritic structure, particularly on the dendrite arm spacing of cast alloy TiAl. It is generally known, that reducing the dendrites arms spacing leads to an increase of mechanical properties and to reduction of segregation distances.
dcterms:title
Affecting of dendritic microstructure of Ti-47Al by alloying with yttrium Affecting of dendritic microstructure of Ti-47Al by alloying with yttrium
skos:prefLabel
Affecting of dendritic microstructure of Ti-47Al by alloying with yttrium Affecting of dendritic microstructure of Ti-47Al by alloying with yttrium
skos:notation
RIV/61989100:27360/11:86080868!RIV12-MSM-27360___
n18:predkladatel
n19:orjk%3A27360
n4:aktivita
n7:P
n4:aktivity
P(ED0040/01/01)
n4:dodaniDat
n9:2012
n4:domaciTvurceVysledku
n5:6608787 n5:8478279
n4:druhVysledku
n11:D
n4:duvernostUdaju
n21:S
n4:entitaPredkladatele
n22:predkladatel
n4:idSjednocenehoVysledku
184809
n4:idVysledku
RIV/61989100:27360/11:86080868
n4:jazykVysledku
n10:eng
n4:klicovaSlova
primary and secondary dendrite arms spacing; microstructure; TiAl alloys
n4:klicoveSlovo
n14:TiAl%20alloys n14:microstructure n14:primary%20and%20secondary%20dendrite%20arms%20spacing
n4:kontrolniKodProRIV
[78A0E058FFCA]
n4:mistoKonaniAkce
Ostrava
n4:mistoVydani
Ostrava
n4:nazevZdroje
Den interních doktorandů 2011 : sborník semináře Fakulty metalurgie a materiálového inženýrství : Vysoká škola báňská - Technická univerzita Ostrava, 6.12.2011
n4:obor
n17:JG
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
2
n4:projekt
n20:ED0040%2F01%2F01
n4:rokUplatneniVysledku
n9:2011
n4:tvurceVysledku
Čegan, Tomáš Kursa, Miroslav
n4:typAkce
n6:CST
n4:zahajeniAkce
2011-12-06+01:00
s:numberOfPages
4
n13:hasPublisher
Vysoká škola báňská - Technická univerzita Ostrava, Fakulta metalurgie a materiálového inženýrství
n12:isbn
978-80-248-2523-6
n16:organizacniJednotka
27360