I read about how Korean researchers have come up with a way to solve the problems of iron-aluminium alloys by adding a small amount of nickel to refine the grain structure and drastically increasing the shear strength. The alloy is on a par with titanium for strength and density but no mention is made of hardness or melting point which are presumably lower. Such alloys have been made in the past but they crack rather than bend. You would think such an alloy would be able to be cast by the home foundry user without any special equipment other than furnace and crucibles etc. as all the metals can be cast already. It would be great to score a copy of the article and see how hard it is to make the stuff. https://www.popularmechanics.com/technology/news/a13919/new-steel-alloy-titanium/ https://www.sciencealert.com/new-super-steel-alloy-is-as-strong-as-titanium-but-10-times-cheaper https://www.nature.com/articles/nature14144
Is it castable?, I don't know....but all of it's components are readily castable: iron, aluminium and nickel.
