Abstract
The structural changes in solutionized AA2618 during natural aging and their effects on subsequent artificial aging were investigated by hardness measurements, X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. The changes in lattice parameter and hardness during natural aging indicate that copper-enriched clusters form in the earliest stage, followed by the formation of magnesium-enriched clusters and copper-magnesium co-clusters. Prior natural aging consistently weakened the hardening during subsequent artificial aging at 180, 200 and 230°C but had no effects on artificial aging at 150°C. The decreased age hardening was attributed to the reversion of small clusters/zones that formed during prior natural aging. The lattice parameter exhibited erratic changes with increasing artificial aging time, reflecting the complex sequence of the reversion and precipitation.
| Original language | English |
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| Pages | 773-782 |
| Number of pages | 10 |
| State | Published - 2006 |
| Event | 2006 TMS Annual Meeting - San Antonio, TX, United States Duration: Mar 12 2006 → Mar 16 2006 |
Conference
| Conference | 2006 TMS Annual Meeting |
|---|---|
| Country/Territory | United States |
| City | San Antonio, TX |
| Period | 03/12/06 → 03/16/06 |
Keywords
- Age hardening
- Aluminum alloy
- Precipitation