Patent ID: 11932923
Assignee: OHIO STATE INNOVATION FOUNDATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 4:
5. A method of improving mechanical properties of a secondary aluminum alloy, the method comprising:
adding manganese to the secondary aluminum alloy to form the aluminum alloy having improved mechanical properties; and
cooling the aluminum alloy having improved mechanical properties;
wherein the aluminum alloy having improved mechanical properties comprises:
aluminum;
silicon;
from greater than 0.3% by weight to 1% by weight iron, based on the total weight of the aluminum alloy; and
from 0.1% by weight to 1.3% by weight manganese, based on the total weight of the aluminum alloy; and
from 0.005% by weight (50 ppm) to 0.018% by weight (180 ppm) strontium, based on the total weight of the aluminum alloy;
wherein the manganese is present in amount effective to suppress the formation of a β-Al5FeSi phase during casting of the aluminum alloy,
wherein the iron and manganese are present in an iron to manganese ratio of from 1.6:1 to 2.6:1, and
wherein the cooling comprises cooling the aluminum alloy at a cooling rate ranging from 3° C./s to 350° C./s.