Table 3
Summary of precipitation progress during artificial-ageing/creep-ageing of AA2050 with WQ, T34 and T84 initial tempers at 155 °C (summarised from [6,13,16,19]).
| Initial temper | Initial state | Precipitation progress | Final state |
|---|---|---|---|
| WQ | SSSS | Nucleation and growth of GP zones and δ ′ → Nucleation and growth of T1 and minor θ ′/S ′ | T 1 and δ ′ with minor θ ′/S ′ (24 h) |
| T34 | Cu-rich clusters | Dissolution of Cu clusters → Nucleation and growth of precipitates (mainly T 1 with minor θ ′) | T 1 with minor θ ′ (18 h) |
| T84 | T 1 with minor θ ′ | Coarsening of T 1 (slight increase in precipitate length and volume fraction) | T 1 with minor θ ′ (50 h) |
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