20.500.12556/DKUM-20956 KARAKTERIZACIJA NEOKSIDIRANEGA DELA NOTRANJE OKSIDIRANE BAKER ALUMINIJEVE ZLITINE PREOBLIKOVANE PO ECAP POSTOPKU IN PREUČITEV POSTOPKA Z VIDIKA DIFUZIJE INOVACIJ CHARACTERIZATION OF UNOXIDIZED PART OF INTERNAL OXIDISED Cu-Al ALLOY FORMED BY ECAP PROCEDURE AND EVELUATION OF THE PROCES FROM FIZUSION OF INOVATION WIEUPOINT Današnje inženirstvo napreduje, proti novim tehnologijam materialov, kar odpre nove konstrukcijske možnosti zmanjševanja presekov, vztrajnostnih mas in dimenzij izdelkov. Vse izrazitejše se kažejo potrebe po uporabi, naprednih materialov z specifičnimi lastnostmi, kot so visoka trdnost in trdota, izboljšana žilavost, odpornost na ciklično utrujanje, povečana električna in toplotna prevodnost, ter toplotna obstojnost. Proizvodnja takšnih materialov, zahteva nove proizvodnje tehnologije, in uporabo vseh dosedanjih znanj iz področja materialov. Lastnosti materiala, lahko izboljšamo na različne načine, osredotočili se bomo predvsem na zmanjševanje velikosti kristalnih zrn in vnašanje drobnih delcev v mikrostrukturo. Z zmanjšanjem velikosti kristalnih zrn, dosežemo večje napetosti tečenja, v skladu z Hall-Petchovo odvisnostjo. Ko se zmanjša velikosti zrn pod 1µm, imamo opravka z materiali, ki imajo, nove edinstvene kombinacije lastnosti. Študij literature je pokazal, da je mogoče doseči submikronsko, in celo nanokristalno mikrostrukturo, z aplikacijo velikih plastičnih deformacij. To dosežemo z izpostavljanjem materiala velikim tlakom, torziji oz. enostavnemu strigu. Eden najbolj obetavnih postopkov z tega področja, je tako imenovan ECAP postopek, pri katerem je prisotna možnost uporabe v industrijski praksi, ki bo preučena v tej publikaciji. The development of engineering advances towards new procedures in materials science. This opens a new variety of construction options, with the possibilities of reduced cross-sections, as well as smaller mass and dimensions of the finished product. The requirement for this are new engineering materials, with specific properties of high strength and hardness, improved ductility, high cyclic fatigue resistance, increased electrical and thermal conductivity and improved heat resistance. The production of materials with such characteristics requires new manufacturing methods, as well as the usage of the knowledge in materials science up to date. There are several means by which, the properties of materials may be enhanced, in this paper we will focus mainly on grain size refinement and the implication of small particles into the micro-structure. The yield strength is inversely proportional to the grain size of the material which is described by the Hall-Petch relation. When the grain size moves close to its optimum value, the material shows, a new and unique set of properties. Studies of publications on this subject have shown, that it is possible to attain a sub-micron of even nanoscale grain size, by exposing the material to severe plastic deformation. That is attained by imposing high, pressure, torque or shear strains upon the workpiece. One of the most promising among the many SPD processes is ECAP (equal channel angular pressing), which has the possibility of industrial application, which will be reviewed at the end of this document. Tehnologije materialov inovacijski manegement ecap(equal channel angular presing) spd (severe plastic deformation) notranja oksidacija karakterizacija cu-al zlitine nanokristalne kovine mehanske lastnosti utrjevalni mehanizmi hall-petch-ova enačba proizvodnja nanokristalnih kovin karakterizacija nanokovin optični mikroskop sem (rasterski elektronski mikroskop) tem (presevni elektronski mikroskop) ebsd( sipanje povratnih elektronov) ecap izvedbe priprav vzorcev za rastersko Materials science Innovation management ECAP (equal channel angular pressing) SPD (severe plastic deformation) Internal oxidation Characterization of Cu-Al alloy Nanocristaline metals Mechanical properties Strengthening mechanisms Hall-Petch relation Production of nanocristaline materials Characterization of nanometals Optical microscope SEM (Scanning electron microscope) TEM (Transmission electron microscope) EBSD (Electron backscattered defraction) ECAP Variations Sample preparation for SEM electronic microscopy Wagner theory Applications and markets for SPD materials Theory of innovation management Diffusion of innovation Methods of scientific research true true false [P. Kirbiš] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2011-10-12 10:15:54 2011-10-13 13:34:47 2022-04-14 08:25:04 2023-12-28 03:07:00 2011 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1+005.591.6(043.2) 16741142 URN:SI:UM:DK:Z57HLDEE UNI_Kirbis_Peter_2011.pdf UNI_Kirbis_Peter_2011.pdf 1 033886A236E0C656E8B50AA3E22B5BB5 d1218af2dc6ac1a76cb61757657edceaa8fa86b820cfaf06a3ff6ca273fa1c37 bf1078b7-7c05-11eb-bb7a-00155d0001ca 20.500.12556/dkum/c05f20af-4b39-46cf-ad03-5bc98471ac24 https://dk.um.si/Dokument.php?lang=slv&id=26321 Fakulteta za strojništvo 0 0 0