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The 2024 aluminium alloy sheets in the T4 temper were welded successfully by the friction stir welding techniques. The AlCuMg (U -phase) of metastable precipitates was found to exist in the thermo-mechanically affected zone using TEM analysis. Moreover, the U -phase is likely to induce the formation of two distinct microhardness minima in the stir zone of FSW weld. The AlCu3 and Cu2Mg particles were precipitated on the grain boundary of the thermomechanically affected zone and in the weld nugget region, respectively. K e y w o r d s: aluminium alloys, friction stir welding, microstructure, transmission electron microscopy

Microstructure and precipitated phase in the thermo-mechanically affected zone of friction stir welded joint for 2024 aluminium alloy