20.500.12556/DKUM-53311 Visokotemperaturna stabilnost mikrostrukture hitro strjene zlitine Cu-Zr S postopkom hitrega strjevanja lahko v zlitinskih sistemih zmanjšamo stopnjo izcejanja in velikosti zrn, ali pa dosežemo celo prenasičeno trdno raztopino. Atomizirani prahovi in hitro strjeni trakovi so v nadaljevanju procesa navadno izpostavljeni visokim temperaturam (sintranje, ekstruzija, itd.). Uporabna vrednost hitrega strjevanja je zato pri posameznem zlitinskem sistemu pogosto odvisna tudi od visokotemperaturne stabilnosti hitro strjene mikrostrukture in odpornosti delcev utrjevalne faze na rast. Z raziskavami visokotemperaturne stabilnosti mikrostrukture hitro strjenih trakov smo za zlitino Cu-Zr določili kinetiko in aktivacijsko energijo rasti delcev intermetalne faze. V prispevku predstavlejni rezultati kažejo, da je rast delcev kontrolirana z volumsko difuzijo cirkonija, in da velja zveza r3~t pri vseh raziskanih temperaturah. The rapid solidification of the alloy is characterized by a refinement of the scale of segregation and grain size or by a significant increase in solubility. Atomized powders and rapidly solidified ribbons are in further proceeding mostly subjected to high temperature treatments (sintering, extrusion, etc.). Consequently, it is clear that the stability of the microstructure and coarsening resistance of the strengthening particles are of great importance. In researching the high temperature microstructure stability of the rapidly solidified Cu-Zr alloy, the kinetic and activation energy or the growth of dispersed intermetallic particles were determined. The results presented in this paper show that particles coarsen by bulk diffusion controlled with the diffusivity of zirconium and the 3~t relationship was obtained at all temperatures of the experiment. metalurgija zlitina Cu-Zr hitro strjevanje Ostwaldovo zorenje metallurgy Cu-Zr alloys rapid solidification Ostwald ripening true false false Inštitut za kovinske materiale in tehnologije Slovenski jezik Neznan jezik Delo ni kategorizirano 2015-07-10 20:01:51 2015-07-10 20:01:51 2022-06-03 03:09:22 2019-07-11 08:06:56 1997 0 0 str. 41-45 št. 1/2 Letn. 31 1997 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 31742209 3010838 1318-0010 URN:SI:UM:DK:V1MMX2A6 http://www.dlib.si/details/URN:NBN:SI:doc-W7IUKZU0 1 https://dk.um.si/Dokument.php?lang=slv&id=77871 Fakulteta za strojništvo 0 0 0