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In this study atom probe tomography was used to investigate themicrostructure of AA2198 (Al-1.35Cu-3.55Li-0.29Mg-0.08Ag) over a range ofageing conditions to examine the evolution of phases in the alloy, inparticular aiming to reveal the nucleation mechanism of the strengthening T1phase, which has been under debate for decades. T1 precursor phases wereobserved from early ageing, a significant number of which were connected tosolute-enriched dislocations. Ag and Mg segregation to T1 interfaces wasconvincingly observed when the plates were oriented perpendicular to theprobing direction, which is the condition under which the spatial resolution ofthe atom probe data is highest.

Microstructural evolution during ageing of Al-Cu-Li-x alloys