科研之友
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摘要
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 thermo-mechanically affected zone and in the weld nugget region, respectively.
