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Alumina particles were dispersed in a 6061-T6 aluminum alloy plate with 6 mm in thickness by friction stir processing in order to enhance the strength. The macro- and microstructures and mechanical properties of processed specimens were investigated. The plates were machined for insert the alumina particles of groove with 3 mm or 5 mm in width and 3 mm in depth. Three types; pillar, taper and left screw were used of the type of probe shapes. The insert depth of the probes from the surface was 5 mm or 6 mm. The area of dispersed alumina particles became large in order of pillar, taper and left screw. In case of the probe inserted 5 mm into the plate, alumina particles were dispersed near the surface of the plate. Using the left screw probe, alumina particles were dispersed in onion ring of the stir zone. Hardness of the processed plate was enhanced by dispersion of alumina particles that showed a higher value than that of the base metal, and the highest hardness value was obtained approximately 161HV0.1. Maximum tensile strength of the processed specimen was obtained using the taper probe, groove width of 3 mm and inserted 6 mm into plate, which was showed approximately 189 MPa.

Effect of probe shape on dispersibility of alumina particle into 6061 aluminum alloy by friction stir processing