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A RESEARCH ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THE DISSIMILAR JOINT WAS CARRIED OUT SO AS TO UNDERSTAND THE EFFECTS OF POST-WELD HEAT TREATMENT (PWHT) ON MICROSTRUCTURAL EVOLUTION, MICROHARDNESS, TENSILE AND FLEXURAL PROPERTIES OF THE DISSIMILAR FRICTION STIR WELDED (FSWED) JOINT. THE RESULTS SHOWED THAT THERE IS A SUFFICIENT AND RATHER COMPLICATED MATERIAL MIXING IN THE NUGGET ZONE (NZ). AFTER PWHT, THE GRAINS IN THE JOINT AREA EXCEPT FOR THE NZ DEMONSTRATED A GRAIN REFINEMENT WITH MORE HOMOGENEOUS AND EQUIAXED GRAINS. FINE AND CLUSTERED SIC PARTICLES IN THE NZ ARE CON-FIRMED BY SCANNING ELECTRON MICROSCOPE (SEM). IN ADDITION, THE MICROHARDNESS VALUES OF NUGGET ZONES BOTH IN AS-WELDED AND PWHT CONDITION EXHIBITED A HIGHER VICKERS COMPARED TO THAT OF AA6061-O. FURTHERMORE, A MAXIMUM TENSILE STRENGTH OF 183.30 MPA THAT DEMONSTRATES A 52.22% INCREASE IN TENSILE STRENGTH IS ALSO OBSERVED IN THE TRANSVERSE TENSILE TESTS SUBSEQUENT TO PWHT. CONSIDERING THE THREE-POINT BENDING TEST RESULTS, IT IS EXPLICIT THAT AN INCREASE OF 121.96% IN THE BENDING EXTENSION IS OBTAINED AS THERE IS NO SIGNIFI-CANT INCREASE IN MAXIMUM BENDING FORCE AFTER THE PWHT.
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