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Abstract
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 3Li) and T 1 (Al 2CuLi) as well as the triplex δ′/β′(Al 3Zr)/T 1 and δ′/β′/θ′(Al 2Cu). The reduction of elastic energy associated with composite precipitate formation is suggested as a basic mechanism with plate-like T 1 and θ′ particles serving as preferential sites for nucleation of either δ′ or δ′/β′ spherical particles, which although in much smaller numbers, represent a volume fraction of 10 to 20% of all precipitates.
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