Abstract
A combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging and three-dimensional atom probe analyses (3DAP) technologies was employed to accurately characterize the composite precipitate structure. Two types of the composite precipitate structure, i.e. δ′/T1 and δ′/T1/δ′ (T1-Al2CuLi and δ′-Al3Li), were observed. 3DAP analysis further confirmed the existence of this structure and solutes distribution was precise determined by concentration profiles. We also found that the coarsening of T1 was achieved by the nucleation of precursor on one side of matured T1 precipitate uncovered by δ′ precipitate and the coarsening of the inward T1 precipitate within the composite structure may would be depressed by the sideward δ′ precipitate.
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