Abstract
Microstructure control always plays a key role in enhancing properties of high-strength Al alloys. Attempts to improve the micro-structure of 7000 series alloys by addition of 1.0 wt% Li have been made for a long time, but unsystematically. This article compares the microstructural features of 1.0 wt% Li-containing Al-Zn-Mg-Cu alloy with those of Li-free Al-Zn-Mg-Cu alloy by using differential scanning calorimetric (DSC) techniques, Vickers microhardness and transmission electron microscopy (TEM). The results show the dominance of Guinier Preston (GP) zones, η′or η phases in 1.0 wt% Li-containing Al-Zn-Mg-Cu alloy, and confirm the capability of Li to retard the rate of precipitates growth and coarsening.
| Original language | English |
|---|---|
| Pages (from-to) | 565-570 |
| Number of pages | 6 |
| Journal | Chinese Journal of Aeronautics |
| Volume | 21 |
| Issue number | 6 |
| DOIs | |
| State | Published - Dec 2008 |
Keywords
- Al-zn-mg-cu-li
- Alloys
- DSC
- Microhardness
- Precipitates
- TEM