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Strengthening in age-hardenable alloys is mainly achieved through nano-scaleprecipitates whose formation paths from the atomic-scale, solute-enrichedentities are rarely analyzed and understood in a directly-verifiable way. Here,we discover a pathway for the earliest-stage precipitation in Al-Mg-Si alloys:solute clustering leading to three successive variants of FCC clusters,followed by the formation of non-FCC $GP$-$zones$. The clusters, whichoriginally assume a spherical morphology ($C1$), evolve into elongated clustersand orient themselves on $\{111\}_{Al}$ ($C2$) and subsequently on$\{100\}_{Al}$ planes and $<$$100$$>_{Al}$ directions ($C3$). We also analyzethe association of quenched-in dislocations with clustering phenomena. Theresults of this work can open a new frontier in advancingalloy-process-property design for commercially-important age-hardenable Alalloys.

Atomic-scale pathway of early-stage precipitation in Al-Mg-Si alloys