Effects of aging time on the wear resistance of alumina particulate reinforced MMCs

Abstract Aging effect on the wear resistance of alumina particulate-reinforced 6061 aluminum matrix composites with a block-on-ring wear tester has been investigated. Specimens with various Al2O3 volume fractions of 0%, 10% and 20% were employed in this work. Experimental results indicated that over-aged monolithic 6061 Al had the best wear resistance, as compared with under-aged and peak-aged conditions. For the composite containing 10% Al2O3, over-aging and peak-aging resulted in similar wear resistance, which was higher than that for under-aging conditions. For the composite containing a high volume fraction (20%) of Al2O3, the wear resistance reduced with the increase in aging time. Although longer aging time was favourable to the wear resistance of monolithic 6061 Al, it was detrimental to that for the Al2O3/6061 Al composite with high volume fraction of particles.
Keywords: MMC, Wear, Aging.

Full Access to Technical Paper
PDF version for $20.00
Search
Sort By:  Relevance
Showing results 1 - 5
Text
Summary: This paper describes the use of dynamic scheduling and discrete event control to provide coordinated control of multiple automated vehicles. This work has been carried out within ongoing research into multi-robot coordination developed around the underground mining scenario. Demonstrations using scaled laboratory models of underground mines illustrate the potential for this technology for full-scale implementation for mine-wide automation.
Publication: CIM Bulletin
Author(s): J. King, R. Gosine, B. Delaney, T. Norvell, S. O'Young
Issue: 1069
Volume: 96
Year: 2003
Text
Summary: Geographic information systems (GIS) provide an efficient means for the recording, manipulation, revision, display and analysis of spatially referenced data. GIS are widely used at the exploration stage of mine development, and are increasingly used for reclamation planning. The ability of a GIS to perform spatial searches and query spatially referenced data make it a powerful tool for use at all stages of mine development. As the amount of data available for analysis increases, so does the...
Publication: CIM Bulletin
Author(s): U. Dillon, G. Blackwell
Issue: 1069
Volume: 96
Year: 2003
Text
Summary: The traditional metallurgical scale-up techniques for flotation plants are based on lumped flotation rate constants, dimensionless hydrodynamic numbers and the use of safety factors. Once the plant has been designed, the flotation principles that govern scale-up play almost no role in the optimization of the circuit to meet its metallurgical targets. This deficiency can potentially lead to a plant design incapable of meeting its targets, especially when circuits incorporate large flotation...
Publication: CIM Bulletin
Author(s): B.K. Gorain, A.W. Stradling
Keywords: Flotation, Modelling, Plant design, Circuit optimization, Bubble surface area flux.
Issue: 1069
Volume: 96
Year: 2003
Text
Summary: The competitive pressure, the increasing energy costs and the environmental regulations impose substantial challenges to the definition of power plants serving industrial facilities. Primary mining and metallurgical facilities have even greater challenges because they are often located remotely, where the fuel supply can be a problem. The absence of a power grid imposes challenges on the reliability and quality of the electrical energy supply. In addition, the facilities usually require...
Publication: CIM Bulletin
Author(s): D. Berkley
Keywords: Cogeneration, Remote location, Feasibility, Reliability, Energy supply, Turbines.
Issue: 1069
Volume: 96
Year: 2003
Text
Summary: The mechanization of mining operations in underground coal mines has led to faster cutting rates of coalfaces with increased levels of emission of gaseous and particulate contaminants in the workings. Consequently, the fresh air streams from the main ventilation systems reaching distant workings are often insufficient, ineffective or inadequate and have to be supplemented by auxiliary ventilation systems to create and maintain the required working environments underground. The efficiencies of...
Publication: CIM Bulletin
Author(s): R.S. Suglo, S. Frimpong, I.R. Muirhead
Keywords: Mechanization, Auxiliary ventilation systems, Underground mining, System drivers, Monitoring.
Issue: 1069
Volume: 96
Year: 2003
Powered by Coveo Enterprise Search