Friction stir processing has been shown to be able to successfully incorporate ceramic reinforcements into 7050 aluminium. Volume fractions of over 50% of 1.55 micron and 4.82 micron WC particles were readily incorporated into 7050 aluminium plates, with some regions of up to 70%. A composite layer could be produced which was 1 mm thick. With proper processing these surface composite layers can be made with a uniform distribution. The hardness was raised to values of HK100 hardness that was at least 200 points higher with a maximum of almost 300. Abrasive wear tests are underway and while the results are not yet known, no effort has been made in this study to optimize the particle size or composition. It is believed that by using the reinforcement particles that have been successfully used in other wear resistant aluminum composites, the wear resistance of the surface can be improved without effecting the properties of the bulk aluminum. This technique offers a chance to design specialized surface composites that could be more economical to produce than by other methods currently in use.
Friction stir powder processing to create surface composites
2003
11 Seiten, 5 Bilder, 2 Tabellen, 22 Quellen
Aufsatz (Konferenz)
Englisch
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