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题名: Variation of nanoparticle fraction and compositions in two-stage double peaks aging precipitation of Al-Zn-Mg alloy
作者: Wang, YL;  Song, YY;  Jiang, HC;  Li, ZM;  Zhang, D;  Rong, LJ
发表日期: 2018-4-27
摘要: Atom probe tomography (APT) coupling high-resolution transmission electron microscopy (HRTEM) was used to analyze the fraction and compositions of different nanoparticles in two-stage double peaks aging process of Al-Zn -Mg alloy. Al content is found to be closely related to the size of nanoparticles and it can be greater than similar to 50.0 at. % in the nanoparticle with the equivalent radius under similar to 3.0 nm. Correspondingly, Al content of the nanoparticle, with the equivalent radius over similar to 5.0 nm, is measured under similar to 40.0 at. %. Evolution from Guinier-Preston (G.P.) zone to. phase is a growing process where Mg and Zn atoms enter the nanoparticle, therefore rejecting Al atoms. G.P. zones can take up a number fraction of similar to 85.0 and similar to 22.7% of nanoparticles in the first and second peak-aged samples, respectively, and even in the over-aged (T73) sample, they can still be found. As aging time increases, fraction of eta' phases monotonically rises to the peak value (similar to 54.5%) in the second peak-aged state and then drops, which is significant for the second hardness peak and directly proves their function as the transitional medium. In T73 state, similar to 63.3% nanoparticles compose of. phases, which were measured to still contain similar to 10.2 to similar to 36.4 at. % Al atoms.
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Recommended Citation:
Wang, YL,Song, YY,Jiang, HC,et al. Variation Of Nanoparticle Fraction And Compositions In Two-stage Double Peaks Aging Precipitation Of Al-zn-mg Alloy[J]. Nanoscale Research Letters,2018,13:-.

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