16 KB908 KB11 KB200020262013Ipek, Medihaštevilka:1letnik:47str. 111-114ISSN:1580-2949COBISSID:961706URN:URN:NBN:SI:doc-LHNKEXLPenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijebakrove zlitineelektrična prevodnostprahoviprašna metalurgijasintranjetrdotautrjevanje s staranjemCharacterization of an Cu-Cr-Zr alloy synthesized with the powder-metallurgy technique| Karakterizacija zlitine Cu-Cr-Zr, sintetizirane s tehniko prašne metalurgije|A Cu-1.5 % Cr-0.5 % Zr alloy was prepared with the powder-metallurgy (PM) method. Cu-Cr-Zr powders were pressed under 390 MPa of uniaxial compression and sintered at 1000 °C for 2 h. After the holding time, the samples were immediately taken out of the furnace and pressed at 850 MPa. The sintered samples were solution-treated at 1000 °C for 15 min and water quenched. Then they were deformed by 20 % at room temperature and aged at 470 °C for (2, 4, 6 and 8) h. A SEM investigation revealed that the Cr and Zr particles having a limited solubility in Cu distributed homogeneously in the copper matrix. An XRD analysis showed that each sample (sintered and aged at 470 °C for different times) has the same phases: copper and trace Crsub{2}Osub3. The relative density of the sinter-pressed sample increased from 92 % to 96 % due to cold deformation. The microhardness of the samples ranged from 77 HV for the solution-treated and water-quenched sample to 116 HV for the aged sample, and the electrical conductivity of the samples increased from 76 % IACS for the sinter-pressed sample to 87 % IACS for the sample aged for 8 hZlitina Cu- 1,5 % Cr- 0,5 % Zr je bila izdelana po metodi prašne metalurgije (PM). Prahovi Cu-Cr-Zr so bili enoosno stisnjeni s 390 MPa in 2 h sintrani na temperaturi 1000 °C. Potem so bili vzorci vzeti iz peči in stisnjeni z 850 MPa. Sintrani vzorci so bili raztopno žarjeni 15 min na temperaturi 1000 °C in ohlajeni v vodi. Nato so bili deformirani za 20 % pri sobni temperaturi in starani (2, 4, 6 in 8) h na temperaturi 470 °C. Preiskava s SEM je odkrila, da imajo delci Cr in Zr omejeno topnost v Cu in da so enakomerno razporejeni v osnovi iz bakra. Rentgenska analiza (XRD) je pokazala, da ima vsak vzorec (sintran in različno dolgo staran na 470 °C) enake faze: baker in sledove Crspodaj{2}Ospodaj3. Relativna gostota sintranega in stisnjenega vzorca je s hladno deformacijo narasla iz 92 % na 96 %. Mikrotrdota vzorcev je bila v območju od 77 HV za raztopno žarjen in v vodi ohlajen vzorec ter do 116 HV za staran vzorec. Električna prevodnost sintranega in stisnjenega vzorca je bila 76 % IACS in je narasla na 87 % IACS pri vzorcu, staranem 8 hTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije