17 KB190 KB15 KB199219991998Križman, AlojzSpaić, SavoZupanič, Francštevilka:1/2letnik:32str. 35-39ISSN:1318-0010COBISSID:3804182URN:URN:NBN:SI:doc-198AICW8slInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijealuminijeve zlitinealuminium alloyborfazna ravnotežjamikrostrukturasilicijtitanželezoRazpad alfa-AlB12 v zlitinah Al-B in Al-Ti-B| Decomposition of alpha-AlB12 in Al-B and Al-Ti-B alloys|In this work it was found out that decomposition of the high-temperature phase @-AIB12 doesn´t occur during cooling of the Al-B and Al-Ti-B alloys from the two-phase region L + AIB12 or the three-phase region L + @-AIB12 + TiB2. It decomposes only in the course of isothermal annealing under -900°C. According to data in the open literature its decomposition should start alredy under 980°C. The decomposition of @-AIB12 takes place by dissolution of @-AIB12 and growth of AIB2. The decomposition rate is higher in ternary Al-Ti-B than in binary Al-B alloys, because TiB2 phase promotes the nucleation of the reaction product AIB2V tem delu smo ugotovili, da faza @-AIB12 ne razpade pri ohlajanju zlitin Al-B in Al-Ti-B z dvofaznega področja talina + @-AIB12 oziroma s trofaznega področja talina + @-AIB12 + TiB2 do sobne temperature. Razpade šele pri izotermnem žarjenju zlitin pod -900°C, čeprav bi po podatkih iz dostopne literature morala razpasti že pod 980°C. Razpad faze @-AIB12 poteka z raztapljanjem @-AIB12 in rastjo AIB2. Kinetika razpada je hitrejša v ternarnih zlitinah Al-Ti-B kot v binarnih Al-B, ker faza TiB2 olajša nastanek reakcijskega produkta AIB2Nadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije