19 KB121 KB16 KB199219991998Fine, JosephJenko, MonikaMandrino, Đorđeletnik:32številka:6str. 437-441ISSN:1318-0010COBISSID:89514URN:URN:NBN:SI:doc-2C3OK6RQenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijekristalimikrostrukturasegregacijaselenzlitineSurface segregation studies of selenium on FeSiAl alloy| Raziskave površinske segregacije selena na FeSiAl zlitini|Surface segregation of selenium in a polycristalline FeSiAl alloy with 0.05% Se was investigated by high resolution Auger Electron Spectroscopy and X-ray Photoelectron Spectroscopy. Surface segregation measurements of selenium and impurities e.g. carbon, phosphorus and sulfur, were performed in situ under UHV conditions in the temperature range from 200 to 900°C. In the low temperature range, 200<T<550°C, carbon segregated due to its high diffusion and segregation enthalpy. Carbon segregated in the form of graphite clusters. At higher temperature T>850°C sulfur and selenium segregated. The selenium segregation rate was low, probably due to its low solubility in ?$\alpha$?Fe and its high vapour pressure. The grain boundary segregation of selenium was negligible. The fracture facets were practically taransgranular, only on some areas intergranular decohesion was noticedPovršinsko segregacijo selena na polikristalinični zlitini FeSiAl legirani z 0,05% Se smo raziskali z visokoločljivo spektroskopijo Augerjevih elektronov na poljsko emisijo (HR AES) in z rentgensko fotoelektronsko spektroskopijo (XPS). Meritve površinske segregacije selena in elementov nečistoč kot so ogljik, fosfor in žveplo so potekale v temperaturnem področju od 200 do 900°C in situ v ultravisokem vakuumu. V nizko temperaturanem področju 200<T<500°C, ogljik segregira na površini zaradi visokega difuzijskega koeficienta in entalpije segregacije. Ogljik je na površini segregiral kot grafit v otočkih. Pri višjih temperaturah T>850°C sta na površini segregirala žveplo in selen. Stopnja segregacije selena je bila nizka, predvidevamo da je vzrok temu nizka topnost selena v ?$\alpha$?Fe in visok parni tlak. Segregacija selena po mejah zrn je zanemarljivo majhna. Skoraj vse prelomljene facete so bile transkristalne, le nekaj je bilo interkristalnih prelomovNadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije