Browsing by Subject "SI ALLOY"

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    Tribological and mechanical properties of Al alloyed bearings
    (ELSEVIER SCIENCE SA) Ünlü, BS; Durmus, H; Akgün, S
    Aluminum based alloys are widely used as journal bearing materials in tribological applications. Duralumines, AlMgSi are widely used as journal bearing materials for aluminum based alloys. These alloys provide properties expected from journal bearings. In this study, tribological and mechanical properties of these journal bearings manufactured from aluminum alloys were investigated. SAE 1050 steel shaft was used as counter abrader. Experiments were carried out in every 30 min for the total of 150 min by using radial journal bearing wear test rig. Wear resistance of AI alloyed bearings increased about 2-3 times and journal wear resistance increased about 2-8 times. The highest bearing wear rate occurred in pure AI bearings while the lowest bearing wear rate occurred in AlMgsi bearing. (C) 2009 Elsevier B.V. All rights reserved.
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    Investigation of the Influence of the Pre-Aging Process on the Hardness of 6082 and 7075 Aluminum Alloys
    (CARL HANSER VERLAG) Sahin, S; Durmus, H; Yuksel, N
    In this study, the effect of pre-aging time and temperature on mechanical properties of aluminium alloys 6082 and 7075 has been investigated. Pre-aging has been applied at 50, 60, 70 and 80 degrees C for 24, 72, 144 hours after solution treatment process at 560 degrees C for 1 hour. Then these samples have been subjected to an aging process at 180 degrees C and 125 degrees C. The hardness of samples has been measured during aging process regularly. Eventually, it was determined that if pre-aging process is performed at low temperature, an increase of hardness occurs and hardness decreases with increasing temperature during aging.