Al-Zn-Mg-Cu-Sc high strength alloy for aerospace and automotive castings
View Patent ↗An aluminum casting alloy, comprises, in weight percent, about 4-9% Zn; about 1-4% Mg; about 1-2.5% Cu; less than about 0.1% Si; less than about 0.12% Fe; less than about 0.5% Mn; about 0.01-0.05% B; less than about 0.15% Ti; about 0.05-0.2% Zr; about 0.1-0.5% Sc; no more than about 0.05% each miscellaneous element or impurity; no more than about 0.15% total miscellaneous elements or impurities.
1. A shaped cast aluminum alloy product produced from a casting alloy consisting of, in weight percent:
from 4 to 9% Zn;
from 2 to 4% Mg;
from more than 1.0 wt % Cu to 2.5% Cu;
less than 0.1% Si;
less than 0.12% Fe;
less than 0.5% Mn;
from 0.01 to 0.05% B;
less than 0.15% Ti;
from 0.05 to 0.2% Zr;
from 0.1 to 0.5% Sc;
no more than 0.05% each miscellaneous element or impurity;
no more than 0.15% total miscellaneous elements or impurities; and
remainder Al;
wherein the shape cast aluminum alloy product is produced from a casting process consisting of investment casting, permanent mold casting, semi-permanent mold casting, and sand mold casting.
2. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Zn is 7.37%.
3. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Mg is 2.46%.
4. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Cu is 1.58%.
5. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Si is no more than 0.04%.
6. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Fe is no more than 0.05%.
7. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Mn is no more than 0.11%.
8. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the B is 0.02%.
9. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Zr is 0.12%.
10. The shaped casting aluminum alloy product according to claim 1 , wherein a concentration of the Sc is 0.3%.