20.500.12556/RUL-130042 Določevanje mehanskih lastnosti kavitacijsko utrjene aluminijeve zlitine Al 7075 Determination of mechanical properties of water peened aluminium alloy Al 7075 V zaključni nalogi smo različno starane kose aluminijeve zlitine 7075 kavitacijsko utrdili in določili njihove mehanske lastnosti. Zanimal nas je vpliv kavitacijskega utrjevanja na hrapavost površine, električno prevodnost, mikrotrdoto in mikrostrukturo predhodno starane aluminijeve zlitine. Aluminijevo zlitino smo najprej starali pri 145°C, 170°C ali 195°C, eden izmed vzorcev pa ni bil staran. Vsi vzorci so bili nato kavitacijsko utrjeni z 40% pokritostjo. Ugotovili smo da po kavitacijskem utrjevanju površini povišamo hrapavost in povišamo trdoto v primeru da zlitina ni predhodno prestarana. Bolj kot je vzorec prestaran višjo hrapavost površine dobimo po utrjevanju, samo povišanje trdote pa ne pride tolik do izraza, v skrajnem primeru lahko material celo omehčamo. In this final thesis differently aged specimens of aluminium alloy 7075 were water peened and their mechanical properties were analised. The influence of water peening on surface roughness, electrical conductivity, microhardness and microstructure of aged aluminium alloy was investigated. First the aluminium alloy was aged at 145°C, 170°C or 195°C, besides one specimen that was not aged. All of the specimen were water peened with 40% coverage. Analysis of the results shows that the surface roughness and hardness of material increase after water peening. Overaging of the material results in higher surface rougness and barely any change in hardness. Water peening of the overaged material can even result in decreased hardness of the material. kavitacijsko utrjevanje aluminijeva zlitina Al 7075 staranje mehanske lastnosti mikrotrdota hrapavost površine električna prevodnost mikrostruktura water peening aluminium alloy Al 7075 ageing mechanical properties microhardness surface roughness electrical conductivity microctructure true false false [U. Čavič] Slovenski jezik Angleški jezik Zaključna naloga 2021-09-10 08:31:28 2021-09-10 08:31:29 2023-11-17 12:22:10 0000-00-00 00:00:00 2021 0 Ljubljana 0 XIV, 34 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.789:532.528:669.715(043.2) 233452 78740739 10276.pdf 10276.pdf 1 DC7E22E3006818F743D8D23050DAE255 b77e0493f2081657c7e3e853186bfb95e8ccba1a8f61c0082c781f0135c66843 7b638fb7-1200-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=147093 Fakulteta za strojništvo 0 0 0