Cast aluminum alloys for automotive applications by microstructure refinement using tsp treatment

A method of casting an aluminum alloy comprising:

• mixing a powdered aluminum alloy with a powdered TSP;
• pressing the mixture of powdered TSP and powdered aluminum alloy into a compacted preform;
• casting a master aluminum alloy from the compacted preform and into an ingot;
• adding the master aluminum alloy ingot throughout a molten base aluminum alloy to form a modified aluminum alloy;
• and
• casting the modified aluminum alloy into an ingot.

A method of casting an aluminum alloy comprising:

• casting a master aluminum alloy having a trisilanol phenyl polyhedral oligomeric silsesquioxanes (TSP) modifier into an ingot;
• adding the master aluminum alloy ingot into a molten base aluminum alloy to form a modified aluminum alloy;
• heating the modified aluminum alloy for a period of time;
• and
• casting the modified aluminum alloy into an ingot,
• wherein the modified aluminum alloy has a parts per million (ppm) loss of less than 10% after being continually heated at or above 700° C. during the period of time, and the period of time is greater than 1.5 hours.