Abstract
The heterogeneous precipitation behavior and nucleation and growth mechanisms of η phase at E/Al interfaces in 7475 aluminum alloy were studied using high resolution transmission electron microscopy (HRTEM) and 3D reconstruction technique in high angle annular dark field scanning transmission electron microscopy (HAADF-STEM). It is found that the nucleation location, nucleation rate, growth rate and morphology of η phase are greatly different when η phase are formed at E particles with different morphology and volume or the same E particle. The decisive factors that affect the nucleation, growth and coarsening of η phase are the interface energy and elastic strain energy of E phase. The growth of η phase belongs to the diffusion-controlled transformation. Solute atoms are transferred by the interphase interface diffusion at a high speed.
| Translated title of the contribution | 7475 铝合金中 η 相沿 E/Al 相界的非均匀析出机理 |
|---|---|
| Original language | English |
| Pages (from-to) | 2483-2489 |
| Number of pages | 7 |
| Journal | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
| Volume | 51 |
| Issue number | 7 |
| State | Published - Jul 2022 |
Keywords
- 7475 Al alloy
- E/Al interface
- heterogeneous precipitation
- phase transformation mechanism