Additively Manufacturable High-Temperature Strength Printable Al Alloys

An aluminum alloy with high strength at high temperature includes an aluminum matrix with over 80 molar % aluminum and L12 precipitate phases having a maximum dimension no greater than 20 nm in the aluminum matrix. The L12 precipitate phases have a formula of Al3M, wherein M in the L12 precipitate phases comprises at least one of erbium and zirconium. The alloy further includes greater than 0 and up to 2 molar % nickel, from 0.1 to 1.5 molar % zirconium, and 0.1 to 1 molar % zirconium, where the erbium content is greater than the zirconium content. This alloy and other compositions as well as the processing conditions for producing the compositions can be formulated via a computer-implemented method involving evaluation of material properties of simulated products formed from a plurality of precursor compositions.