Alloy 7075
The procedure for optimization of alloy compositions and melt temperatures for Alloy 7075 was similar to that de- scribed in Figure 2 and that was used for optimization of Alloys 2024 and 6082. A mass ratio, mr the ∆TL
= 6 was chosen and was greater than the stipulated value of 55C (99F) in Figure (= TL1 –TL2 (a) (a) ) was measured to be 124C (223F) which
Mass Fraction of Mn (b) (b)
(c) Mass Fraction of Mg Si = 0.7 wt%, Mn = 1.0 wt% (c)
(d) Mass Fraction of Mg
Figure 8. Three Isopleths from the Al-Si-Mg-Mn phase diagram showing the average compositions of (a) Alloy 1, (b) Alloy 2 and (c) Alloy 3 (6082).
50
Figure 9. Typical as-cast microstructures of 6082 alloy at various conditions shown in Table 3. (a) 6082C1 (non- dendritic primary phase), (b) 6082C2 (partially dendritic primary phase, (c) 6082C3 (dendritic primary phase) and (d) 6082CC (dendritic primary phase).
International Journal of Metalcasting/Spring 11
Temperature (ºC)
Temperature (ºC)
Temperature (ºC)
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