@article{
author = "Ćosić, Milena and Dojčinović, Marina and Aćimović-Pavlović, Zagorka",
year = "2014",
abstract = "The purpose of this study was to investigate possible application of AlSi alloy produced by rheocasting process in cavitation conditions. A rheocasting process was used to refine the as cast microstructure and improve the mechanical properties of Al18wt%Si alloy. Mechanical stirring was applied to the melt for different stirring time: 60,120,180s at different temperatures below the liquidus temperature of the alloy, using different stirring speed values, before pouring into a metallic mould. The microstructure of the cast samples was characterized by optical and scanning electron microscopy. The paper investigates the effect of stirring speed and stirring time on the microstructure of AlSi alloy obtained by rheocasting procedure. The microstructure morphology and the alloy mechanical properties were found to depend on the stirring time and the stirring speed, and by using a suitable combination of these parameters it is possible to achieve high refinement efficiency by treating the melts in the semisolid state. Cavitation resistance of these samples has been tested. Mass loss of specimens was measured by an analytical method. The morphology of damaged surfaces of tested samples was examined using scanning electron microscopy (SEM). According to the results, it can be concluded that the samples of AlSi piston alloy prepared via rheocasting process, can be successfully applied in conditions where the cavitation resistance is needed., Cilj ovog istraživanja je bio da se ispita mogućnost primene AlSi legure dobijene reokasting postupkom u kavitacionim uslovima. Reokasting postupak je korišćen kako bi se poboljšala mikrostruktura i mehanička svojstva Al18%Si legure. Primenjeno je mehaničko mešanje rastopa različitim brzinama mešanja, pri različitim vremenima mešanja od 60,120 i 180s, na različitim temperaturama ispod likvidus temperature pre livenja u metalni kalup. Karakterizacija mikrostrukture livenih uzoraka izvedena je pomoću optičkog i skenirajućeg elektronskog mikroskopa. U radu je ispitivan uticaj brzine i vremena mešanja na mikrostrukturu legure, koja je dobijena pomenutim postupkom.Utvrđeno je da mikrostrukturna morfologija i mehanička svojstva zavise kako od brzine mešanja tako i od vremena mešanja, i da se podesnom kombinacijom ovih parametara mogu postići visoka rafinirajuća svojstva rastopa, koji je procesiran u oblasti poluočvrslog stanja. U radu je ispitivana kavitaciona otpornost uzoraka. Gubitak mase meren je primenom analitičke metode. Morfologija oštećenih površina uzoraka ispitivana je pomoću SEM-a. Prema rezultatima ispitivanja, može se zaključiti da se uzorci AlSi klipnih legura dobijenih reokasting postupkom, mogu uspešno primeniti u uslovima gde je potrebna kavitaciona otpornost.",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Microstructural properties and cavitation behavior of hypereutectic Al-Si alloy obtained by rheocasting process, Mikrostrukturna svojstva i kavitaciono ponašanje nadeutektičke Al-Si legure dobijene reokasting postupkom",
pages = "326-323",
number = "3",
volume = "55",
doi = "10.5937/ZasMat1403323C"
}
