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On the atomic model of Guinier-Preston zones in Al-Mg-Si-Cu alloys

Abstract : Structural feature of equiaxed Guinier-Preston zones with the diameter of ∼2 nm in an Al-Mg-Si-Cu alloy has been systematically investigated by three-dimensional atom probe analyses, high-resolution electron microscopy and first-principles calculations. The results suggest that Si and Mg planes alternate along [001]Al with Cu atoms diversely substituting for some Si sites. An fcc-based Mg1(Si,Cu)1 model was then proposed for the first time, with expanded a, b and compressed c lattice parameters compared to Al. Meanwhile the structural evolution of Mg1(Si,Cu)1 → (Mg,Cu)1(Si,Cu)1 → β″-(Mg,Cu)1Mg4(Al,Cu)2Si4 is suggested.
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Soumis le : jeudi 24 octobre 2019 - 17:07:46
Dernière modification le : mardi 19 octobre 2021 - 22:56:59




Siliang Liu, Kai Li, Jiangbo Lu, Gang Sha, Jianchuan Wang, et al.. On the atomic model of Guinier-Preston zones in Al-Mg-Si-Cu alloys. Journal of Alloys and Compounds, Elsevier, 2018, Journal of Alloys and Compounds, 745, pp.644-650. ⟨10.1016/j.jallcom.2018.01.304⟩. ⟨hal-02332322⟩



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