18 KB478 KB17 KB200020242012Průša, FilipVojtěch, Daliborštevilka:4letnik:46str. 339-343ISSN:1580-2949COBISSID:936618URN:URN:NBN:SI:doc-QFXLQEIVenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijaluminiumaluminumironmetalurgija prahovpowder metallurgysolidificationstrjevanježelezoApplication of powder metallurgy in the processing of aluminium scraps with high-iron contents| Uporaba postopkov prašne metalurgije za predelavo odpadkov na osnovi Al z visoko vsebnostjo Fe|The Al-14Si-8Fe and Al-22Si-8Fe-1Cr (w/%) alloys were prepared via melt centrifugal atomization and compaction at a pressure of 6 GPa. The resulting alloys were porosity-free with good contacts between the particles. The structures were very fine and consisted of primary alpha(Al) dendrites, eutectic silicon and the betha-Al5FeSi phase. The Vickers hardness values of the Al-14Si-8Fe and Al-22Si-8Fe-1Cr alloys were (170 10) HV5, (185 16) HV5, respectively. Compressive strength values were 670 MPa and 720 MPa, respectively. Surprisingly, both alloys exhibited a very good plasticity due to the refined structure. The alloys were annealed at 300-400 °C for 100 h to reveal their thermal stability. When the thermal stability of the powder-metallurgy Al-14Si-8Fe and Al-22Si-8Fe-1Cr alloys was compared to that of the casting-piston Al-12Si-1Cu-1Mg-1Ni alloy, the former was found to be superiorZlitini Al-14Si-8Fe in Al-22Si-8Fe-1Cr (w/%) sta bili pripravljeni s centrifugalno atomizacijo in hladnim enoosnim stiskanjem s tlakom 6 GPa. Izdelane zlitine so bile brez por z dobrim stikom med delci. Zlitini sta imeli zelo fino mikrostrukturo, ki je vsebovala primarne alfa(Al)-dendrite, Si-evtektik in fazo beta-Al5FeSi. Trdota zlitine Al-14Si-8Fe je bila (170 10) HV5 in (185 16) HV5 zlitine Al-22Si-8Fe-1Cr. Tlačna trdnost zlitin je bila 670 MPa oziroma 720 MPa. Presenetljivo sta imeli obe zlitini tudi odlično plastičnost zaradi rafinirane strukture. Zlitini smo žarili 100 h pri 300-400 °C, da bi ugotovili njuno termično stabilnost. Ugotovili smo, da je termična stabilnost izdelanih P/M-zlitin Al-14Si-8Fe in Al-22Si-8Fe-1Cr superiorna v primerjavi z ventilsko litino Al-12Si-1Cu-1Mg-1NiTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije