I heard that the advanced materials team of SpaceX went to help design the alloys used for the castings. They needed a castable aluminum resistant to corrosion

I heard that the advanced materials team of SpaceX went to help design the alloys used for the castings. They needed a castable aluminum resistant to corrosion, rigid enough that didn’t need heat treatment. From what I heard at Munroe they had to design a new alloy to meet all requirement and that is unheard of in the automotive market (off the shelf components culture) It make sense that SpaceX had expert in that field (for turbine components)