2509 KB17 KB200020242014Novák, PavelVoděrová, MilenaVojtěch, Daliborštevilka:3letnik:48str. 349-353COBISSID:1055658ISSN:1580-2949URN:URN:NBN:SI:doc-G5FNIXE5enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve zlitinealuminium alloyaluminium alloyshot pressingmicrostructuremikrostrukturasolidificationstrjevanjevroče stiskanjeMicrostructure of rapidly solidified and hot-pressed Al-Fe-X alloys| Mikrostruktura hitro strjenih in vroče stiskanih zlitin Al-Fe-X|Rapidly solidified aluminium alloys are promising materials for many technical applications. The main advantages of aluminium alloys alloyed with transition metals, such as Ni, Fe, Cr or Mn, are a good strength-to-weight ratio, a relatively low price, improved mechanical properties and a thermal stability. Mechanical properties of these alloys can be improved with rapid-solidification techniques. In this work, a production method employing melt spinning, cryogenic milling of melt-spun ribbons and the subsequent hot pressing was tested. The Al-11Fe, Al-7Fe-4Cr and Al-7Fe-4Ni alloys were processed in this way. The microstructure and mechanical properties of the prepared alloys were compared with the cast materials of the same composition. The results showed that the proposed technology can lead to a significant microstructure refinement and hardness improvement of the investigated alloys, when compared with the as-cast state. In the case of the Al-Fe alloy, a local coarsening of the Al13Fe4 particles was observed. Hot pressing is suggested to be a promising method for processing rapidly solidified alloys with respect to maintaining a fine structure and satisfactory hardnessHitro strjene aluminijeve zlitine so obetajoč material za različno tehnično uporabo. Glavne prednosti aluminijevih zlitin, legiranih s prehodnimi kovinami, kot so Ni, Fe, Cr ali Mn, so ugodno razmerje med trdnostjo in maso, relativno nizka cena, izboljšane mehanske lastnosti in termična stabilnost. Mehanske lastnosti teh zlitin se lahko izboljša s tehniko hitrega strjevanja. Preizkušena je bila metoda izdelave z uporabo ulivanja tankega traku, kriogeno mletje tankega ulitega traku in končno vroče stiskanje prahu. Tako so bile izdelane zlitine Al-11Fe, Al-7Fe-4Cr in Al-7Fe-4Ni. Mikrostruktura in mehanske lastnosti izdelanih zlitin so bile primerjane z litim materialom z enako sestavo. Rezultati so pokazali, da predložena tehnologija, v primerjavi z litim stanjem, povzroča občutno drobnejšo mikrostrukturo in povišanje trdote. Pri zlitini Al-Fe je bilo opaženo lokalno povečanje delcev Al13Fe4. Domneva se, da je vroče stiskanje obetajoča metoda za obdržanje drobnozrnate strukture in zadovoljive trdoteTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije