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- W831940558 abstract "The effects of natural aging (NA) on subsequent artificial aging (AA) at 180 °C in Al–Mg–Si–Cu alloys with varied Mg/Si ratios (0.5, 1 and 2) were systematically studied by Vickers micro-hardness measurements, differential scanning calorimetry and transmission electron microscopy (TEM). The alloy with large Mg/Si ratio possesses a significant negative NA effect on the maximum hardness achieved during AA preceded by an extended NA, while the alloy with small Mg/Si ratio shows a negligible negative NA effect. Though few lath-like Qʺ/L precipitates exist, needle-like βʺ precipitates are the primary hardening precipitates in all the peak-aged alloys. The negative NA effect is demonstrated to be determined by precipitate coarsening, which is manifested microscopically as the broader precipitate length distributions (PLD) and shift of PLD toward larger length range, in AA with the prolonging of NA. Our results suggest the nature of NA clusters is quite different in Al–Mg–Si–Cu alloy varying in Mg/Si ratio. Only a small fraction of NA clusters in alloy with large Mg/Si ratio are stable and could induce preferential growth of precipitates to be considerably coarsened during AA. A large fraction of stable NA clusters in alloy with low Mg/Si ratio lead to synchronous growth of βʺ precipitates, thus restricting the preferential growth." @default.
- W831940558 created "2016-06-24" @default.
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- W831940558 date "2015-08-01" @default.
- W831940558 modified "2023-10-17" @default.
- W831940558 title "The influence of Mg/Si ratio on the negative natural aging effect in Al–Mg–Si–Cu alloys" @default.
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- W831940558 doi "https://doi.org/10.1016/j.msea.2015.06.090" @default.
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