A method of forming an aluminum alloy, the method comprising: (a) forming a melt consisting of: 1 to 8 weight percent magnesium; at least one first element selected from the group comprising 0.1 to 4 weight percent scandium, 0.1 to 20 weight percent erbium, 0.1 to 15 weight percent thulium, 0.1 to 25 weight percent ytterbium, and 0.1 to 25 weight percent lutetium; at least one second element selected from the group comprising 0.1 to 20 weight percent gadolinium, 0.1 to 20 weight percent yttrium, 0.05 to 4 weight percent zirconium, 0.05 to 10 weight percent titanium, 0.05 to 10 weight percent hafnium, and 0.05 to 5 weight percent niobium; at least one of: 3 to 12 weight percent zinc; 0.2 to 3 weight percent copper; 0.5 to 3 weight percent lithium; and 4 to 25 weight percent silicon; no more than 0.1 weight percent iron, 0.1 weight percent chromium, 0.1 weight percent manganese, 0.1 weight percent vanadium, 0.1 weight percent cobalt, and 0.1 weight percent nickel; no more than 1 weight percent total other elements including impurities; the balance aluminum; (b) solidifying the melt to form a solid body by a rapid solidification process in which the cooling rate is greater than 10 3 °C/second; (c) heat treating the solid body; wherein the heat treating comprises: solution heat treatment at 800°F (426°C) to 1100°F (593°C) for thirty minutes to four hours; quenching; and aging at 200°F (93°C) to 600°F (316°C) for two to forty-eight hours. (a) forming a melt consisting of: 1 to 8 weight percent magnesium; at least one first element selected from the group comprising 0.1 to 4 weight percent scandium, 0.1 to 20 weight percent erbium, 0.1 to 15 weight percent thulium, 0.1 to 25 weight percent ytterbium, and 0.1 to 25 weight percent lutetium; at least one second element selected from the group comprising 0.1 to 20 weight percent gadolinium, 0.1 to 20 weight percent yttrium, 0.05 to 4 weight percent zirconium, 0.05 to 10 weight percent titanium, 0.05 to 10 weight percent hafnium, and 0.05 to 5 weight percent niobium; at least one of: 3 to 12 weight percent zinc; 0.2 to 3 weight percent copper; 0.5 to 3 weight percent lithium; and 4 to 25 weight percent silicon; no more than 0.1 weight percent iron, 0.1 weight percent chromium, 0.1 weight percent manganese, 0.1 weight percent vanadium, 0.1 weight percent cobalt, and 0.1 weight percent nickel; no more than 1 weight percent total other elements including impurities; the balance aluminum; 1 to 8 weight percent magnesium; at least one first element selected from the group comprising 0.1 to 4 weight percent scandium, 0.1 to 20 weight percent erbium, 0.1 to 15 weight percent thulium, 0.1 to 25 weight percent ytterbium, and 0.1 to 25 weight percent lutetium; at least one second element selected from the group comprising 0.1 to 20 weight percent gadolinium, 0.1 to 20 weight percent yttrium, 0.05 to 4 weight percent zirconium, 0.05 to 10 weight percent titanium, 0.05 to 10 weight percent hafnium, and 0.05 to 5 weight percent niobium; at least one of: 3 to 12 weight percent zinc; 0.2 to 3 weight percent copper; 0.5 to 3 weight percent lithium; and 4 to 25 weight percent silicon; 3 to 12 weight percent zinc; 0.2 to 3 weight percent copper; 0.5 to 3 weight percent lithium; and 4 to 25 weight percent silicon; no more than 0.1 weight percent iron, 0.1 weight percent chromium, 0.1 weight percent manganese, 0.1 weight percent vanadium, 0.1 weight percent cobalt, and 0.1 weight percent nickel; no more than 1 weight percent total other elements including impurities; the balance aluminum; (b) solidifying the melt to form a solid body by a rapid solidification process in which the cooling rate is greater than 10 3 °C/second; (c) heat treating the solid body; wherein the heat treating comprises: solution heat treatment at 800°F (426°C) to 1100°F (593°C) for thirty minutes to four hours; quenching; and aging at 200°F (93°C) to 600°F (316°C) for two to forty-eight hours. solution heat treatment at 800°F (426°C) to 1100°F (593°C) for thirty minutes to four hours; quenching; and aging at 200°F (93°C) to 600°F (316°C) for two to forty-eight hours.