740 KB15 KB200020242014Ajredini, FadilIzairi, NesetRistova, MimozaVevecka-Priftaj, Aferditaštevilka:3letnik:48str. 385-388COBISSID:1056938ISSN:1580-2949URN:URN:NBN:SI:doc-XFNKARVXenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeequal-channel angular pressingmechanical propertiesmehanske lastnostimicrohardnessmikrotrdotanatezni preizkussevere plastic deformationtensile testultradrobna zrnavelika plastična deformacijaEnhancement of mechanical properties of the AA5754 aluminum alloy with a severe plastic deformation| Izboljšanje mehanskih lastnosti aluminijeve zlitine AA5754 z veliko plastično deformacijo|Mechanical properties of materials with ultrafine grain (UFG) size have attracted considerable scientific attention and technological interest during the last few years. It was well established that the grain size of metallic alloys may be substantially refined with a severe plastic deformation (SPD). The present work focuses on equal-channel angular pressing (ECAP) as the most used method of SPD for grain refinement inducing a significant enhancement to the mechanical and functional properties of the commercial AA5754. ECAP with up to 6 passes resulted in a substantial grain-size reduction from 70 %m of an as-received sample to 5 %m. The aforementioned reduction of the grain size increased the microhardness by a factor of 4. These results were compared to those of AA3004Zadnjih nekaj let vzbujajo pozornost znanstvenikov in tehnologov mehanske lastnosti materiala z ultradrobnimi zrni (UFG). Ugotovljeno je bilo, da je z uporabo velike plastične deformacije (SPD) mogoče močno zmanjšati velikost zrn v kovinski zlitini. To delo poroča o metodi "equal-channel angular pressing" (ECAP) kot najpogosteje uporabljeni SPD za zmanjšanje zrn, ki povzroči občutno povečanje mehanskih in funkcionalnih lastnosti komercialne zlitine AA5754. ECAP povzroči občutno zmanjšanje velikosti zrn iz 70 %m pri dobavljeni zlitini na 5 %m po 6 prehodih. Omenjeno zmanjšanje velikosti zrn je povečalo mikrotrdoto za faktor 4. Rezultati so bili primerjani z rezultati pri zlitini AA3004TEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije