22 KB721 KB19 KB200020242012Balci, ErhanCamuşcu, NecipSarikan, BertanŰbeyli, Mustafaštevilka:4letnik:46str. 393-397ISSN:1580-2949COBISSID:937898URN:URN:NBN:SI:doc-DVRNLMJNenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijeageinganorganski materialibending testinorganic materialskovinski materialimetallic materialsstaranjeupogibni preizkusInvestigation on the aging behaviour of the functionally gradient material consisting of boron carbide and an aluminum alloy| Raziskava ponašanja pri staranju funkcionalnih gradientnih materialov iz borovega karbida in aluminijeve zlitine|In the current study the effect of different temperatures on the aging behaviour of a functionally gradient material was investigated to observe the variation of hardness with respect to the aging time. To do this, the functionally-gradient-material (FGM) specimens, containing boron carbide and aluminum alloy, were produced with hot pressing. Three different layers were used in the FGM samples. Then the macro and micro examinations were carried out to observe the interface between the layers, the porosity, the grain size and probable cracks in these samples. After that the specimens were solutionized at 470 °C for 1 h. Next, the artificial aging at 100 °C, 120 °C and 150 °C was applied to the FGM specimens for 96 h. During the aging treatment, the Brinell hardness measurements were made on the samples at certain intervals. Moreover, three-point bending tests were also carried out to clarify the influence of the aging treatment on the strength of the FGM. Experimental results indicated that the highest hardness values were obtained at 120 °C after the aging period of 48-65 h. The aged specimens exhibited higher bending strength than the solutionized specimensV tej študiji je prikazan vpliv različnih temperatur na staranje funkcionalnega gradientnega materiala in spreminjanje trdote v odvisnosti od časa staranja. Vzorci funkcionalno gradientnih materialov (FGM), ki vsebujejo borov karbid in aluminijevo zlitino, so bili izdelani s stiskanjem v vročem. Trije različni sloji so bili uporabljeni za FGM-vzorce. Na vzorcih so bile izvršene makro- in mikropreiskave stikov med sloji, določene so bile poroznost, velikost zrn in prisotnost morebitnih razpok. Potem so bili vzorci 1 h raztopno žarjeni na 470 °C, nato pa umetno starani 96 h na temperaturah 100 °C, 120 °C in 150 °C. Med postopkom staranja so bile v določenih intervalih izvršene meritve trdote po Brinellu. Dodatno je bil izvršen še tritočkovni upogibni preizkus, da bi opredelili vpliv staranja na trdnost FGM. Rezultati preizkusov kažejo, da je bila dosežena najvišja trdnost pri staranju med 48 h in 65 h na temperaturi 120 °C. Starani vzorci so pokazali večjo upogibno trdnost kot raztopno žarjeni vzorciTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije