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Yasin ALEMDAĞ,,Sadun KARABIYIK,, Harun YANAR and Gençağa PÜRÇEK 13th I nternationalConference on Superplasticity in Advanced Materials (ICSAM 2018), August 19-22, 2018 St. Petersburg, Russia.
Abstract In this study, dry sliding friction and wear properties of Al-7Si-4Zn-3Cu alloy was investigated at as-cast, homogenised and multi-directional forged (MDFed) in three, six and nine passes corresponding one, two and three cycles. The tests were performed by using a ball-on-disc type tribometer (UTS Tribometer T10) according to ASTM- G99 standards. A 100Cr6 steel balls with 6 mm diameter were used during tribological tests. Friction and wear tests were performed under a different load of 2.5-10 N and at a sliding speed of 0.16 ms-1 for a sliding distance of 1000 m. MDF caused an increase in yield and tensile strength and elongation of the alloy. However, their hardness, compressive strength and wear resistance decreased after MDF. As the applied load in wear test increased, the friction coefficient of the samples decreased, but their wear loss showed a reverse trend with it. Amongst the samples, the highest wear loss was obtained from thesample forged by three cycles, while the homogenised sample showed the lowest wear loss. The worn surfaces of thesamples were characterized by extensive smearing,fine scratches and oxidations.But smearing was found to be dominant wear mechanism of the samples.
Keywords: Al-Si based alloys, multi-directional forging, friction and wear
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