Določevanje mehanskih lastnosti kavitacijsko utrjene aluminijeve zlitine Al 7075

Čavič, Urška (author), Šturm, Roman (mentor)

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.

• Language: Slovenian
• Keywords: kavitacijsko utrjevanje, aluminijeva zlitina, Al 7075, staranje, mehanske lastnosti, mikrotrdota, hrapavost površine, električna prevodnost, mikrostruktura
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [U. Čavič]
• Year: 2021
• Number of pages: XIV, 34 str.
• PID: 20.500.12556/RUL-130042
• UDC: 621.789:532.528:669.715(043.2)
• COBISS.SI-ID: 78740739
• Publication date in RUL: 10.09.2021

Secondary language

• Language: English
• Title: Determination of mechanical properties of water peened aluminium alloy Al 7075

Abstract

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.

• Keywords: water peening, aluminium alloy, Al 7075, ageing, mechanical properties, microhardness, surface roughness, electrical conductivity, microctructure