COST 507 - Repositório Aberto da Universidade do Porto

3.3 Results
The investigation showed that in the system studied, only few phases belonged to the
binary and ternary Al subsystems. These phase were Al 2 Cu, AlLi, A1 75 CUJLÌ(TB),
Al 2 CuLi(T,), Al 6 CuLi 3 (T 2 ), Al 2 LiMg, Al 2 CuMg(S). Using the results from the
experiments three isothermal sections of the phase diagram were constructed:
1. At 400 °C with the amount of 1.5 wt.% Cu
2. At 400 °C with the amount of 2.8 wt.% Cu
3. At 500 °C with the amount of 1.5 wt.% Cu
4. At 500 °C with the amount of 2.8 wt.% Cu.
Figure 6 shows the phase boundaries measured at 400 °C.
1. (Al) + S
2. (Al) + S + TB
3. (Al) + S + T B + Τ,
4. (Al) + S + Τ,
5. (Al) + S + Τ, + Τ 2
6. (Al) + S + Τ 2
7. (Al) + S + T 2 + Al 2 LiMg
8. (Al) + T 2 + Al 2 LiMg
9. (Al) + T 2 + Al 2 LiMg + AlLi
10. (Al) + S + Θ
11. (Al) + T B + S + Θ
12. (Al) + Θ
13. (Al) + TB + Θ
14. (Al) + TB
15. (Al) + Τ, + TB
16. (AI) + Τ,
17. (AI) + Τ 2 + Τ,
18. (Α1) + Τ 2
19. (ΑΙ) + AlLi + Τ 2
♦ U, mw%
Figure 6. The isothermal
sections of the Al­Li­Cu­Mg
tetrahedron with the constant
Cu content of 1.5 wt.% (a)
and 2.8 wt.% (b) at 400 °C.
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