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Composite precipitates with duplex and triplex association of single precipitates commonly found in commercial Al–Li alloys were observed by transmission electron microscopy (TEM) in a re-solution and quenched AA2090 alloy after aging. These novel precipitates were the duplex association of δ′(Al 3 Li) and T 1 (Al 2 CuLi) as well as the triplex δ′/β′(Al 3 Zr)/T ...