20.500.12556/DKUM-52821 Faze v kvazikristalni zlitini $Al_{64,4}Cu_{22,5}Fe_{13,1}$ Phase in a quasicrystalline $Al_{64,4}Cu_{22,5}Fe_{13,1}$ V ternarnem sistemu Al-Cu-Fe se pojavlja t.i. i-faza (ikozaedrični kvazikristal), ki je termodinamsko ravnotežna faza in s tem sestavni del ravnotežnega faznega diagrama. Na enofazno področje i-faze meji veliko število intermetalnih faz, ki so lahko glede na sestavo zlitine, razmere pri strjevanju in toplotni obdelavi v stabilnem ali metastabilnem ravnotežju z i-fazo. Sinteza enofazne kvazikristalne zlitine je mogoča samo v ozkem koncentracijskem območju in pri primernem načinu toplotne obdelave, zato je poznavanje in ugotavljanje faz ključnega pomena. V raziskavi smo izdelali zlitino $Al_{64,4}Cu_{22,5}Fe_{13,1}$ in vzorce toplotno obdelali na različne načine. Posamezne faze in druge mikrostrukturne značilnosti smo ugotovili z ustrezno metalografsko pripravo vzorcev in metodami svetlobne mikroskopije (SE), vrstične elektronske mikroskopije (SEM), mikrokemične analize (EDS), rentgenske fazne analize (XRD), presevne elektronske mikroskopije (TEM) ter mikrotrdote. Faze smo ločevali tudi glede na njihovo morfologijo in mikrotrdoto (nanoidentifikacija). Prisotnost i-faze smo potrdili z metodama XRD in TEM. In the ternary system Al-Cu-Fe an i-phase (icosahedral quasicrystal) is present. It is thermodynamically stable and forms a part of the equilibrium phase diagram. However, according to the chemical composition and conditions during the solidification and heat treatment considerable number of intermetallic phases can take part in stabile or metastabile equilibrium with the i-phase. Consequently, synthesis of onephase quasicrystalline alloy is possible only in narrow concentration range after appropriate heat treatment. In the investigation alloy $Al_{64,4}Cu_{22,5}Fe_{13,1}$ was synthesized and heat treated to increase the fraction of the i-phase. The presence of phases and other microstructural characteristics were determined using appropriate metallographic preparation techniques, light microscopy (LM), scanning electron microscopy (SEM), microchemical analyses (EDS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and nanoidentation measurements.The presence of quasicrystalline phase i was clearly confirmed using XRD and TEM. Al-Cu-Fe kvazikristali metalografija Al-Cu-Fe quasicrystal metallography true false true Slovenski jezik Angleški jezik Znanstveno delo 2015-07-10 18:26:10 2015-07-10 18:26:10 2022-06-01 03:07:36 2021-05-10 03:29:12 2007 0 0 str. 271-277 št. 6 Letn. 41 nov.-dec. 2007 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 669.71'3'1:620.18 106193664 11988502 1580-2949 URN:SI:UM:DK:UU7SO7SC Materiali_in_Tehnologije_2007_Boncina_et_al._Faze_v_kvazikristalni_zlitini_Alsub(64,4)-Cusub(23,5)-Fesub(13,1).pdf Materiali_in_Tehnologije_2007_Boncina_et_al._Faze_v_kvazikristalni_zlitini_Alsub(64,4)-Cusub(23,5)-Fesub(13,1).pdf 1 843CD4CAA6B978C7C44FC78E3DB6B857 05b495df432570c7cc7ebb790fa13439b465dd4422420e2b004bdf4061fe27ff ffc2ae7d-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=109947 http://mit.imt.si/Revija/izvodi/mit076/boncina.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=109946 Fakulteta za strojništvo 0 0 0