AVS 47th International Symposium
    Surface Engineering Monday Sessions
       Session SE-MoA

Paper SE-MoA7
Tribological Performance of a Novel High Wear Resistant 390 Al Alloy Overlay

Monday, October 2, 2000, 4:00 pm, Room 201

Session: Coatings for Extreme Environments: Wear Resistant, Lubricious, Anti-corrosive, High Temperature Coatings
Presenter: R.D. Ott, Oak Ridge National Laboratory
Authors: R.D. Ott, Oak Ridge National Laboratory
C.A. Blue, Oak Ridge National Laboratory
M.L. Santella, Oak Ridge National Laboratory
P.J. Blau, Oak Ridge National Laboratory
Correspondent: Click to Email
A novel process has been developed at Oak Ridge National Laboratory (ORNL) for the production of high silicon (Si) containing aluminum (Al) alloy surface layers (overlay) on Al alloys. The main purpose of the overlay is to improve the wear resistance of the underlying alloy. The process is versatile enough to place the overlay only in critical areas, thus, greatly reducing the cost of a component. Instead of manufacturing a component from expensive high Si content 390 Al alloy, the component could be manufactured from an inexpensive alloy, such as 319 Al alloy, and the 390 Al alloy overlay could be placed in essential areas were high wear resistance was required. Test specimens comprising of 390 Al alloy overlays on 319 Al alloy have been processed to mimic bulk 390 Al alloys. Pin-on-disk wear tests have been performed, following ASTM standards, to quantify the wear resistance of the 390 Al alloy overlay with that of bulk 390 Al alloy. Wear tests have also been performed on bulk 319 Al alloy as a baseline. Lubricated and non-lubricated pin-on-disk wear tests were conducted utilizing 440C stainless steel and 52100 steel balls as the pin material. Also evaluated were the frictional forces during the wear tests, scratch hardness, microhardness, and the Hertzian contact pressures. From the tests conducted, the 390 Al alloy overlay shows potential as a replacement of bulk 390 Al alloy for high wear resistant applications.